Growth Of Aquaculture Research Articles

Is existing legislation supporting socially acceptable aquaculture in the European Union? A transversal analysis of France, Italy and Spain

AbstractAccording to the European Commission, aquaculture is among those maritime sectors contributing to the blue economy due to its potential for generating jobs, business opportunities and, most importantly, for ensuring food security in Europe. In 2014, EU member states set new strategies to support sustainable aquaculture and ambitious targets of productions to be met by 2020 in the three segments, marine fish, freshwater fish and shellfish. A recent assessment made by the European Commission concludes that some countries might not be able to attain the established goals and this paper presents an in‐depth analysis of such strategies to identify the social constraints hampering aquaculture growth in France, Italy and Spain as well as the measures established to overcome them. Most of the identified issues are related to the social acceptability of local communities, local stakeholders and consumers, suggesting that this still represents an unsolved issue hampering aquaculture development in Europe. In fact, our results show that (a) the sector suffers from a bad image related to its environmental impacts; (b) a lack of integrated spatial planning is leading to increasing conflicts with other activities; and (c) there is predominance of top‐down consultation mechanisms. It is concluded that there is not a single solution to enhance social acceptability of aquaculture since this depends on a number of social, economic and environmental factors that may differ from site to site, and countries need to adopt a more integrated approach where concerns of local communities and stakeholders are understood and taken into account.

Effects of folic acid on growth performance and blood parameters of flathead grey mullet, Mugil cephalus

Folic acid is one of the most important vitamins for aquatic organisms' growth and health in aquaculture. This study investigates the effect of folic acid administration on the growth and physiological performance and blood parameters of flathead grey mullet. The blood parameters include RBCs, Leucocytic count, PCV, Hb, MCV, MCH and MCHC were chosen as an important tool for fish physiological and health status indicators. A total number of 240 flathead grey mullets were caught and kept in indoor fiberglass tanks with 300 L capacity filled with brackish water. They were divided into 4 treatments: control was fed on a diet without folic acid, T1 was fed on a diet with 10 mg folic acid/kg, T2 was fed on a diet with 30 mg folic acid/kg, and T3 was fed on a diet with 50 mg folic acid/kg for 2 months. The best results of final weight and weight gain were observed on T3 followed by T2. The peak values of the K factor were recorded in control and the GSI values showed a significant increase in T2 followed by T1. The best result of RBCs was recorded in T1 and the peak of the leucocytic count was recorded in T2 followed by T3. The Hb and PCV values showed a significant decrease in the groups treated with folic acid. The best result of MCV was calculated on T1 but the peak value of MCHC was calculated on T3. AST and ALT have recorded the peak values in T3. It could be concluded that folic acid on doses of 30 and 50 mg/kg could improve flathead grey mullet growth and physiological performance, health, and haematological parameters.

Microsatellite polymorphism and genetic differentiation of different populations screened from genome survey sequencing in red-tail catfish (Hemibagrus wyckioides)

The increasing farming scale of red-tail catfish (Hemibagrus wyckioides) in recent years has made great contribution to the sustainable growth of aquaculture in southern China. However, due to the lack of genetic management measures, the long-term domestication process of red-tail catfish was uncertain. In this study, genome survey sequencing at approximately 103 × coverage depth was performed in the species and then SSR markers were screened to assess the genetic variation in two wild and two hatchery populations. The K-mer analysis indicated the genome size of red-tail catfish was about 728 Mb with low heterozygosity. The assembly of 74.85 Gb Illumina data produced 274,929 scaffolds at N50 = 16.3 kb, from which 36,149 genes were annotated using the reference genome of channel catfish (Ictalurus punctatus). A total of 678,251 SSR motifs were detected and 18 polymorphic microsatellite loci were used for population genetics analysis. Genetic diversity levels in four populations were considered to be healthy, with the number of alleles (Na), effective alleles (Ne) and observed heterozygosity (Ho) ranging from 5.44 to 7.56, 3.45 to 4.86 and 0.674 to 0.793, respectively. The genetic differentiation levels among populations were from low to moderate and genetic variations mainly occurred between individuals (98.16 %). Bayesian analysis showed that all populations could be divided into two clusters. All results indicate that the domestication process of the hatchery populations is in an early stage. This study will provide significant guidance for further whole genome sequencing and genetic improvement of red-tail catfish in the future.

National Surveillance Programme For Aquatic Animal Diseases – A Stepping Stone For Establishing Disease Governance System In India

The main driver for National Surveillance Programme for Aquatic Animal Diseases (NSPAAD) in India is the threat of diseases to the growth of aquaculture. Keeping this in consideration, the Department of Fisheries (DoF), Government of India (GoI) is implementing NSPAAD involving 31 collaborating centres in 19 states, and this programme is being coordinated by ICAR-NBFGR, Lucknow. The programme has been successful in developing a network of aquatic animal health laboratories; diagnostic capability for detection of OIE/NACA-listed and emerging pathogens; mechanism for first time confirmation of new diseases; sending alerts/advisories to stakeholders; and providing scientific advice to the farmers. NSPAAD has helped in strengthening passive disease surveillance, which is evident by detection of seven new pathogens. It has enabled DoF in better understanding of disease situation in the country, and meeting international disease reporting obligations. Currently, DoF is contemplating to further strengthen the disease surveillance programme.

Securing a sustainable future for US seafood in the wake of a global crisis

The United States seafood industry is undergoing rapid change, as a result of the current trade war with China, ongoing global COVID-19 pandemic, and new governance mandates. The Executive Order on Promoting American Seafood Competitiveness and Economic Growth , signed in May 2020, proposes wild-capture fisheries deregulation and prioritization of aquaculture, with an emphasis on offshore development. Recent disruption of wild-caught seafood supply and demand could create space for sustainable aquaculture growth, but expansion could also undermine wild fisheries livelihoods and economics if integrated management between industries is ignored. Here, we review the current state of US seafood and outline five guiding principles around the implementation, and possible modifications, of the Executive Order to facilitate sustainable US fisheries and aquaculture: (1) make precise and strategic fisheries reforms that continue to support sustainable wild fisheries, (2) integrate aquaculture and fisheries using an ecosystem-based approach, (3) improve aquaculture data collection, (4) address social resistance to aquaculture, and (5) reconcile nationalism in a global market. Regardless of the Head of State, implementation of these science-informed principles is critical for balancing social-ecological tradeoffs between wild captured and farmed seafood systems, and for ensuring a more resilient US seafood sector under an anticipated future of increased volatility.

The role of women in freshwater aquaculture development in Kenya

Abstract For many years, aquaculture has been erroneously viewed as a male-dominated sector, offering women inadequate opportunities partly due to the high capital investment requirement and or the technologies linked to the venture. Women work in all areas of the aquaculture value chain but their opportunities have not kept pace with aquaculture growth. Hence, they form a larger component of the poor, limiting their income-generating activities and asset building potential. Gender disaggregated statistics that could track women’s engagement in aquaculture activities in Kenya are scanty. Hence, women’s presence, influence and interests are invisible. All aquaculture labour practices should embrace the Sustainable Development Goals 5 that focus on gender equality and empowerment of all women and girls. To that end, gender equality must be mainstreamed into aquaculture planning, development, monitoring and evaluation. This will require concerted political efforts by sector leaders, advocates and gender champions, supported by new technical instruments for implementation. The study leverages on incorporating gender lens and making gender visible in every phenomenon, questioning if, how and why processes, opportunities and standards differ systematically for women and men and not solely for women. Finally, it proposes sections where women’s engagements can be strengthened to increase the importance of aquaculture production in Kenya.

The state of cage culture in Lake Victoria: A focus on sustainability, rural economic empowerment, and food security

Abstract Capture fisheries and aquaculture have remained important sources of food, nutrition, income and livelihoods to millions globally, with annual per capita consumption of fish in developing countries having increased from 5.2 kg in 1961 to 18.8 kg in 2013. On the contrary, low income food-deficit countries annual fish per capita consumption rose from 3.5 to 7.6 kg against 26.8 kg among industrialized countries. Increased demand for animal protein and declining capture fisheries has seen aquaculture grow rapidly than any other food production sector over the past three decades. Rapid global aquaculture growth is directly related to levels of technological advancement, adoption and adaption prompting aquaculture transition from semi-intensive to intensive and super intensive production systems among developing and developed countries. In light of the aquatic environment economic potential, cage culture in Lake Victoria is fast gaining prominence in aquaculture production contribution. This began with trials by Kenya Marine and Fisheries Research Institute and Uganda’s National Fisheries Resource Research Institute and later by private investors at Dunga and Obenge beaches of Kenya, Source of the Nile in Uganda and Bulamba Beach Management Units in Bunda District of Tanzania. However, only Kenya has so far documented cage culture development recording 3,696 cages across the five riparian counties with an estimated production capacity of 3,180 MT valued at Kshs 955.4 Million (9.6 million USD), created over 500 jobs directly and indirectly created income opportunities for over 4,000 people. The sub-sector’s value chain, its supportive value chains and associated enterprises are rapidly expanding thus creating jobs, enhancing incomes and ensuring food security in rural and urban areas. As cage culture commercialization takes root, there is urgent need to address issues such as introduction of alien species, diseases, marine parks and maximum carrying capacity among other aspects. This will require trans-boundary policy to ensure sustainable utilization of the lake as a common resource.

Characterization of multidrug-resistant Aeromonas hydrophila isolated from diseased rohu Labeo rohita (Hamilton, 1822) with associated virulence genes

Diseases hamper the growth of aquaculture, which is caused mainly by opportunistic pathogens that leads to mild clinical signs with periodic mortality at farm level. Present study was conducted to check the causative agent responsible for the death of rohu fish (Labeo rohita), which were showing clinical signs of abdominal dropsy. The moribund fish showed haemorrhages on skin, reddening of gill and pure bacterial cultures were obtained from the abdominal fluid. The isolates were biochemically identified and genetically confirmed as Aeromonas hydrophila based on PCR assay. They showed cytotoxic and haemolytic activity and produced several exoenzymes, which were accountable for the pathogenicity of the isolates. The isolates A11-A17 (A. hydrophila) were found to be associated with 5 virulent genes such as enterotoxin act, alt, lip, haemolytic toxin ahh, type 3 secretion genes such as aex. Furthermore, multiple antibiotic resistance (MAR) index of 0.525 was associated with A16, resistant to infections. The study proves the virulence of A. hydrophila A16 and its resistance to 21 out of 40 tested antibiotics (52%), which is considered as multidrug resistance of A. hydrophila suggesting it to be the emerging major threat to aquaculture.

Aquaculture Over-Optimism

The recent rapid growth in aquaculture production reported by the United Nations Food and Agriculture Organization has resulted in what we denote here as aquaculture over-optimism. An extreme form of which is the notion that we need not worry about depleting wild fish because we can meet the global need for seafood through farming. Here we investigate, whether the recent growth in aquaculture production can be maintained and compare aquaculture production projections with the future need for fish to find out whether aquaculture optimism is justified. We find that aquaculture growth rates in all the cases studied have already reached their peak and have begun declining. Also, our results suggest that for aquaculture alone to supply the projected total global fish demand between 2025 and 2030, it would have to grow by between 11% and 19% per year, rates that are outside the range that been possible to date.

Large-Scale Laboratory Experiments on Mussel Dropper Lines in Ocean Surface Waves

The rapid growth of marine aquaculture around the world accentuates issues of sustainability and environmental impacts of large-scale farming systems. One potential mitigation strategy is to relocate to more energetic offshore locations. However, research regarding the forces which waves and currents impose on aquaculture structures in such conditions is still scarce. The present study aimed at extending the knowledge related to live blue mussels (Mytilus edulis), cultivated on dropper lines, by unique, large-scale laboratory experiments in the Large Wave Flume of the Coastal Research Center in Hannover, Germany. Nine-months-old live dropper lines and a surrogate of 2.0 m length each are exposed to regular waves with wave heights between 0.2 and 1.0 m and periods between 1.5 and 8.0 s. Force time histories are recorded to investigate the inertia and drag characteristics of live mussel and surrogate dropper lines. The surrogate dropper line was developed from 3D scans of blue mussel dropper lines, using the surface descriptor Abbott–Firestone Curve as quality parameter. Pull-off tests of individual mussels are conducted that reveal maximum attachment strength ranges of 0.48 to 10.55 N for mussels that had medium 3.04 cm length, 1.60 cm height and 1.25 cm width. Mean drag coefficients of CD = 3.9 were found for live blue mussel lines and CD = 3.4 for the surrogate model, for conditions of Keulegan–Carpenter number (KC) 10 to 380, using regular wave tests.

Advances in the use of photoheterotrophic, mixotrophic and multi-trophic systems in marine shrimp farming

The growth of aquaculture can cause different environmental impacts, from the use of large amounts of water to the excessive release of effluent. Shrimp farming can be done in different systems: extensive, semi-intensive, intensive and super-intensive. Extensive systems with low productivity (<500 kg ha-1 year-1), exhibit low technological levels and less control of environmental conditions. The semi-intensive system requires food supplementation, reasonable natural productivity, biomas yield of 3,000 - 5,000 kg ha-1 year-1) and water change (5 to 10 % day-1). To increase production, different culture systems are used, such as photoheterotrophic, heterotrophic and mixotrophic, with minimal water exchange (0.5 to 3 % day-1), providing greater biomass yield (intensive 10 to 20 ton ha-1 cycle-1 and super-intensive 20 up to 40 ton ha-1 cycle-1). These can be developed in nursery or grow-out tanks, but with high operating costs, high technological levels, disease control and better control of environmental conditions. However, intensive and super-intensive systems accumulate nitrogen, phosphorus and solid waste that can be transformed into biomass in multi-trophic aquaculture systems. In this review, we will discuss the effects of these systems on water quality and productivity of marine shrimp. The photoheterotrophic, mixotrophic and multi-trophic systems are interesting alternatives to the photoautotrophic systems in shrimp production, demonstrated by the higher zootechnical performance, as well as the environmental quality, since these models promote the minimum exchange of water and the transformation of nutrient residues in biomass.

A report of epizootic ulcerative syndrom (EUS) In Channa punctata (Bloch, 1793) from freshwater fisheries lake in Gondia district Maharashtra

Bhandara and Gondia districts are popularly known as lakes district. Many of the water bodies being exploited for capture fisheries, contributing towards the livelihood of thousands of people; live around and depend on paddy and fish production. However occurrence of disease has become a primary problem to sustainable aquaculture production, thereby affecting the socioeconomic status of fishermen communities in the district. Different opportunistic bacterial pathogens and parasites causing a great deal of losses to the fish industry in terms of high mortality and therefore prevention of fish diseases are of paramount importance in terms of sustainable growth of aquaculture. The present investigation reveals the source of fish mortality due to the severe bacterial infestation of Aeromonas causing red spotted disease and death of fishes in the Kokna Jamidari Lake of the Kokna village.

Environmental impacts of existing and future aquaculture production: Comparison of technologies and feed options in Singapore

In a context of global population growth and increased food demand, the development of the aquaculture industry has become essential, and aquaculture development policies have flourished. However, aquaculture is associated with various environmental impacts, such as eutrophication or climate change. It is therefore important to assess the environmental sustainability of aquaculture development, for example through the use of life cycle assessment (LCA). Yet, there is limited application of LCA to aquaculture technologies in Asian countries, where most aquaculture growth is taking place, and none of them has assessed environmental impacts of both current and future aquaculture systems. Here, we took Singapore as an example of country, which has recently developed aquaculture development strategies, and we performed a comparative LCA of eight Singaporean aquaculture production systems, thus covering all relevant existing and potential future production technologies. To do so, we built comprehensive life cycle inventories (LCI) of 8 categories of aquaculture production for four species groups in Singapore, for both 2017 and 2040. Two options of feed evolution were assessed in 2040: increasing the part of fishmeal and fish oil (FMFO) produced from trimmings and replacing FMFO by insect-based meal and algal oil. We assessed 11 environmental impact categories, including net primary production use. Overall, per unit of edible seafood produced, the production of marine fishes in sea cages near the shore and in recirculating aquaculture systems were found to be the most attractive options to limit the environmental impacts while increasing seafood production in Singapore. Freshwater fishes produced in concrete ponds were found to have the lowest impact indicator scores per ton of edible seafood produced, but these results were highly sensitive to methodological choices and it was deemed constrained by limited potential to increase its production capacity in the future. Increasing the part of FMFO produced from trimmings is found to have more environmental benefits than insect-based meal. However, the uncertainty concerning the future technologies is high, particularly for anticipating future technologies. Further research is therefore needed to refine the assessment of the potential environmental impacts of future aquaculture production systems, including focusing on novel technologies and new feed options specifically adapted to each country. Meanwhile, we recommend analysts to take inspiration from and build on the detailed LCIs developed in the current study to support assessments of aquaculture systems in other underresearched Asian countries.

Sustainable Growth, Resource Rent and Taxes in Aquaculture

Global aquaculture represents an opportunity for sustainable growth in supply of healthy food and private and public income, but also has environmental footprints and thus requires a balanced policy approach by governments. Salmon aquaculture has until recently experienced rapid growth, and periods of high profitability. In all producer countries, salmon aquaculture is subject to different regulations that indirectly restrict output at the firm level and may restrict global supply in the short run. The sector has become a candidate for extraordinary taxation in Norway, and a tax regime which is unique in the context of global food production is under consideration. An argument is that society allocates sea locations to salmon firms for free, and that these provide economic returns well above normal returns to capital due to the number of sites being limited, both in Norway and globally. To this end, this paper uses a panel data set to analyze patterns of productive performance and profitability in Norwegian salmon aquaculture to analyze whether these patters suggest economic rents or infra-marginal profits. We find significant variations in productive and economic performance over time and across firms, a variability that is inconsistent with a claim that all the economic profits are a resource rent generated by a natural resource in the form of limited aquaculture sites. Our results suggest that infra-marginal profits are important part of total profits in the salmon aquaculture sector.

Strategic directions of the aquaculture development in Ukraine

For the development of aquaculture, each country must develop a strategic plan for sustainable aquaculture development, taking into account the spatial planning of aquaculture areas and ensure its implementation. It is important to take into account the experience of European countries, where the driving force of aquaculture is its social perception, which requires taking into account the interests of society when planning the development of the industry. It is important to further study the main factors of development of the fisheries industry in order to economically justify the implementation of measures and proposals that will contribute to the intensive growth of domestic aquaculture. The purpose of the article is to substantiate the strategic directions of sustainable development of aquaculture in Ukraine. Methods of analysis and synthesis, induction and deduction, comparison, analogy, abstraction, system approach are used to determine the principles of introduction of sustainable development of aquaculture. The generalization method is used to formulate conclusions on the practical aspects of implementing the strategy of sustainable development of aquaculture. It is established that in the new economic conditions unfavorable external and internal factors of aquaculture development have led to the dominance of imported fish and seafood in the Ukrainian market, so for the development of aquaculture it is necessary to develop a strategic plan for sustainable development of the industry. The sustainable development of aquaculture aims to create the conditions for aquaculture producers to supply sufficient healthy and safe fish to the market without leading to environmental degradation. The sustainable development of aquaculture aims to create the conditions for aquaculture producers to supply sufficient healthy and safe fish to the market without leading to environmental degradation. In the future, aquaculture in Ukraine should acquire the status of a sustainable industry that guarantees long-term preservation of jobs and development of rural and coastal areas, creating alternatives to traditional fishing both in terms of products produced and employment opportunities of the rural population. To guarantee employment and prosperity, aquaculture must become an economically viable and self-sufficient industry. The market should be the driving force behind the development of aquaculture; production and demand for fish must be balanced and any increase in production above market expectations should not lead to a decrease in producers' incomes. The product range needs to be expanded, and effective market strategies need to be put in place to balance aquaculture production and demand.

Utilization of poultry manure in fish seed rearing under mid-hill condition

The availability of quality seed is the prerequisite for rapid expansion and growth of aquaculture. Fingerling size fish seeds are always in great demand for any type of aquaculture operations. In absence of nursery ponds, the concrete tank fertilized with poultry manure may be one of the alternatives to the rural farmers to increase the survival percentage and growth of fish fry in order to stock their fish ponds with quality fish fingerlings for augmenting fish production. The study highlights the importance of optimum doses of poultry manure, favourable water quality and optimal density of plankton population for higher survival and growth in fish seed nursing. In the changing climate scenario, the environment friendly integrated fish farming with poultry may be one of the best options for improving the fish seed production in Meghalaya and other hilly region of the northeast India.

Coastline extraction and land use change analysis using remote sensing (RS) and geographic information system (GIS) technology - A review of the literature.

Coastlines mapping techniques or the coastline automated analyses have been sought after. In practice, various sorts of seacoasts, for example, biological, silty, arenaceous, artificial, and bedrock coasts, have their own attributes, which force various degrees of intricacy on coastline mapping. As an extraordinary kind of complex artificial coast, aquaculture coast is shaped by the farming of aquatic organisms on silt tidal flats. With the rapid growth of coastal aquaculture in recent years, aquaculture coasts have increased in some developing countries. It has been estimated that aquaculture coasts constitute about 30% of all coastlines in mainland China. In order to identify, monitor, model, and manage the vast expanse of coastal aquaculture, effective methods of extracting aquaculture coastlines from remotely sensed imagery are desired. Secondly, with the rapid economic development in coastal areas, the development of coastal zone resources is also increasing day by day, which benefits the development of island coastal zone. Using oneself has become an important link in the development of marine economy. Due to the limited coastal resources and low environmental carrying capacity, the overexploitation and utilization of coastal resources will lead to a series of problems, such as coastal erosion, coastal migration and accumulation, island area reduction, etc., Both man-made activities and natural factors will lead to coastline changes, which will lead to corresponding changes in coastal ecological environment, thus affecting the coordinated development of coastal economy and the survival of coastal residents. Therefore, efficient, accurate and timely acquisition of coastline information and research on the spatial-temporal changes of coastline are of great significance to the protection of the living environment of coastal residents, the effective development of island and coastal resources, the coordination of sustainable economic development in coastal areas and the mitigation of marine disasters. This paper presents a review of those papers reporting coastline extraction and land use and land cover (LULC) change analysis using remote sensing (RS) and geographic information system (GIS) technology.

Growth and biofouling in kelp aquaculture (Saccharina latissima): the effect of location and wave exposure

Seaweed aquaculture is receiving increasing attention for food and non-food applications in Europe, where it is still an emerging industry. The cultivation of seaweeds in the sea is attractive as it does not compete with agricultural crops for land and freshwater, whilst generating high yearly biomass yield. The selection of suitable cultivation sites in coastal waters is essential for the sustainable establishment and further development of seaweed aquaculture in Europe. Here, we investigate the effects of wave exposure and geographic location on growth and biofouling of kelp (Saccharina latissima), using a transplantation experiment along the Swedish west coast. Biofouling of kelp decreased with increased wave exposure, from 10 and 6% coverage at sheltered and moderately exposed locations, respectively, to 3% at exposed locations. Growth, measured as blade surface area, generally increased with decreased wave exposure, with approximately 40% less growth at exposed locations compared to sheltered or moderately exposed location. We identified that there is large spatial variation in growth and fouling of the seaweed biomass at the selected farm sites, with significant differences from the km-scale to the m-scale. In addition, exposure level affected the tissue composition, with a high carbon, but low nitrogen and water content at exposed locations compared to moderate and sheltered sites. Isotope signatures (i.e. δ13C and δ15N) also differed between exposure levels. Together, these results indicate that wave exposure is an important factor to consider in site selection for both yield as well as quality of the seaweed biomass for future kelp farms.

Strategic planning for optimal development of aquaculture in coastal areas of Qeshm Island

The economic growth of aquaculture and the dependence of a large growing population on coastal resources have led to coastal degradation and reduced resources. In this paper while realizing the potential capacities of the island systems, the aquaculture activities of the island are specially discussed in the framework of Integrated Coastal Zone Management (ICZM). Therefore, in this study, firstly, the internal strategic factors (strengths and weaknesses) and external factors (opportunities and threats) of the environment were identified. Thereafter, Analytic Network Process (ANP) and Super Decision Software in SWOT matrix were used to evaluate and prioritize these factors, as well as to develop several proposed strategies. Using a designed network model, the proposed strategies were weighted and the main strategies of the evaluation matrix were ranked. In this study, the Qeshm Island as the largest island in the Persian Gulf was identified as the study area. The results showed that the most efficient strategies to optimal development of aquaculture use of coastal areas of Qeshm Island are using objectives, policies, and plans of aquaculture and aquatic hunting to build and strengthen sustainable aquaculture in the region, build and strengthen comprehensive aquaculture plans for conservation of natural marine resources in the framework of ICZM, create and develop infrastructure facilities and aquaculture infrastructure in order to create optimum use of the lands, allocate adequate funding to achieve conservation programs and user development of aquaculture and environmental protection involved in (ST) strategies.

Determination of Aquatic Product Growth Factors Based on PCA with Stepwise Regression Test

For the information contained in the growth data of the pearl gentian grouper, there is overlap and inclusion. When establishing the growth model of the pearl gentian grouper, it is difficult to grasp the inherent laws of the growth factors to affect the establishment of the research target model and the operation efficiency. The data dimensionality reduction method is often used in the data preprocessing stage. The Principal Components Analysis (PCA) method was used to analyze and influence the growth factors of the pearl gentian grouper The method of regression fitting optimizes the results of selecting principal components under different criteria. Experimental results show that the main growth factors of the pearl gentian grouper selected by this method can meet the needs of the construction of aquaculture growth models, and can provide a reference for reducing the dimensions of aquaculture fish growth data and the complexity of the modeling process.