Crab Production Research Articles

Perceived Impacts of Climate Change on Coastal Aquaculture in the Cyclone Prone Southwest Region of Bangladesh

The southwest region of Bangladesh is particularly vulnerable to a range of climatic threats, including cyclones, prolonged flooding, sea level rise, saltwater intrusion, drought, and riverbank erosion. The study investigates how these different drivers affect aquaculture systems and aims to provide critical insights for sustainable management. The survey work focused on the problems, vulnerabilities, migration, and adaptive strategies of communities of the southwest region of Bangladesh, that rely heavily on shrimp, fish, and crab production for their livelihoods. Data were collected from the 80 respondents across four unions (Atulia, Burigoalini, Gabura, and Bhurulia) in Shyannagar Upazila, Satkhira District, using a structured questionnaire survey and focus group discussions. Findings reveal that climate change events have significantly changed shrimp farming in enclosures, pond aquaculture, and crab point management, and negatively impacted livelihoods. Pond aquaculture appeared to be the most vulnerable to climate change conditions, followed by shrimp farming in enclosures and crab points. Furthermore, the adverse effects of climate change compelled human migration within the study area, primarily driven by the search for employment. This study provides evidence of the effects of various climate change stressors on shrimp, fish, and crab production systems and the adaptive difficulties of the communities dependent on aquatic ecosystems. As the natural calamity like cyclone cannot be prevented, understanding the impact of previous events may help people of the affected area as well as the policy makers to plan for better survival.

Stock status and spawning potential ratio of orange mud crab (Scylla olivacea, Herbst 1796) in the southwestern coastal waters of Bangladesh

Scylla olivacea (Orange mud crab) is a second commercial invertebrate species exported from Bangladesh. Though a significant portion of exports are supported by aquaculture, their farming ultimately depends on their wild stocks. Unfortunately, unregulated exploitation has led to a significant decline in the natural biomass of this species, raising concerns about the sustainability of crab production in Bangladesh. The study aimed to assess the stock status of S. olivacea (Orange mud crab) from the Southwestern coastal water of Bangladesh. One-year length frequency (width frequency-WF for crustacean fishery) data were collected and analyzed using the LBB (Length-based Bayesian Biomass) and LB-SPR (Length-based spawning potential ratio) methods. The assessed width parameter depicted the exploitation of small-size individuals (Wc=< Wc_opt) of S. olivacea. The estimated B/B0 (0.25) suggests that 75 % of the wild stock had already been harvested, and biomass cannot produce MSY. The mean estimates for SW50 % and SW95 % were 8.29 cm and 12.76 cm respectively, revealing the use of a small mesh-size net for crab harvesting. The assessed Spawning Potential Ratio (SPR) was 12 % which is below the SPR limit reference point (SRP) of 20 %. This research confirmed the overfished (F/M = 1.4) and overexploited (E = 0.58) status of S. olivacea in Bangladesh. To ensure the sustainability of coastal fisheries in Bangladesh, the authorities must take immediate management measures to control the overexploitation of this species.

A regional analysis of climate change effects on global snow crab fishery

AbstractThe snow crab fishery faces increasing vulnerability to environmental factors, yet the literature on the relationship between climate change and snow crab harvest remains limited. This study estimates snow crab harvest functions using climate change indicators with unbalanced panel data of snow crab production from the eastern Bering Sea (Alaska), the southern Gulf of St. Lawrence (Canada), the Sea of Japan, and the Barents Sea (Norway‐Russia). The relationship between snow crab biomass, stock, and catch is analyzed and the endogeneity of stock in the harvest function is also addressed using climate change indicators as instrumental variables (IVs). The results show that the extent of Arctic sea ice is effective in addressing the endogeneity, and the random effects IV model with error components two stage least squares estimator performs the best to control heterogeneity. A 1% increase in snow crab fishing effort is associated with a 0.42% increase in snow crab harvest, and a 1% increase in snow crab stock causes a 0.98% increase in snow crab harvest. The reported estimates indicate a large stock‐harvest elasticity and provide supporting evidence to prioritize stock enhancement in snow crab fishery policy designs to maintain stocks at sustainable levels and minimize government expenditures on subsidies.Recommendations This study explores how snow crab harvests are influenced by snow crab populations and fishing efforts in the context of global warming across various global regions, including the Bering Sea, the Gulf of St. Lawrence, the Sea of Japan, and the Barents Sea. A 1% increase in fishing effort is associated with a 0.42% increase in harvest, while a 1% increase in snow crab population leads to a 0.98% increase in harvest, showing a high dependency on snow crab biomass. Arctic sea ice extent is identified as a crucial climate factor affecting snow crab biomass and harvests, making it a valuable variable for understanding and managing snow crab populations. The study supports the prioritization of stock enhancement policies by fishery agencies and suggests standardizing how fishing effort is measured across different regions to improve snow crab fishery management and future research.

Impact and accumulation of calcium on soft-shell mud crab Scylla paramamosain in recirculating aquaculture system

Soft-shell crabs are highly valued for their commercial significance and culinary appeal. To enhance production of soft-shell crabs, careful attention should be paid to the water calcium concentration in their culture. This study investigated the influences of different levels of calcium concentrations on the molting and growth of mud crab (Scylla paramamosain) within a meticulously controlled recirculating aquaculture system (RAS). We established three distinct water calcium concentration gradients (200, 300, and 450 mg/L) to comprehensively assess feeding habits, molting patterns, growth, and tissue calcium levels of mud crab. Initially, we observed a gradual reduction in water calcium concentrations with increments of crab molting events in RAS. Throughout one molting cycle, the feeding incidence of the crabs remained consistently high from 4 days to 37 days post-molt, irrespective of different calcium concentrations. Nonetheless, high water calcium levels (300 and 450 mg/L) significantly shortened molt intervals and accelerated exoskeletal calcification. Specifically, the molt intervals were 52.30 ± 2.72 d, 41.65 ± 5.24 d, and 37.70 ± 3.02 d, while the carapace hardening durations were 21.51 ± 4.33 h, 17.23 ± 3.38 h, and 13.46 ± 2.76 h at water calcium concentrations of 200, 300, and 450 mg/L, respectively. Moreover, elevated calcium concentrations also significantly enhanced weight gain of the mud crab during molting. Noteworthy, regardless of fluctuations in water calcium concentration, the condition factor of the molting crabs was approximately 63%, which could be an indicator of crab selection in soft-shell crab cultivation. Furthermore, the dynamic changes in calcium concentrations were disparate among different tissues in the post-molt stage. Gill and exoskeleton tissues exhibited an upward trend in calcium concentrations, while hemolymph and hepatopancreas tissues displayed distinct patterns of decrease followed by increase. Gill and exoskeleton tissues were identified as primary sites for calcium absorption and utilization, evidenced by a positive correlation between high calcium concentrations and increased calcium content in these tissues at 6 h and 3 d post-molt. Overall, our findings provide practical evidence for optimizing aquaculture management strategies through adjustments in water calcium concentration, thus to enhance production efficiency and profitability in soft-shell mud crab aquaculture.

On the prospects of fishery of the Barents Sea red king crab within the coastal waters of Russia

Objective: to review the current state of the red king crab stocks in the Barents Sea off the coast of the Kola Peninsula and propose options for optimizing their use.Method: the work is a review of the state of stocks, biology and fishing regime of the red king crab in the Barents Sea coast, based on previously published research results. In addition, unpublished survey data with appropriate explanations were used.Novelty: the review contains information relevant for the summer of 2023 on the fishing regime of the red king crab in coastal waters, examines the prospects for the exploitation of stock of king crab in connection with changes in legislation that occurred in 2023.Results: the coast of the southern part of the Barents Sea is of high importance for the reproduction of the red king crab population and can be considered as a reserve for its fishing in the EEZ of Russia. Among all the sections of the Barents Sea coast, Varanger-Fjord, as the most remote from the area of modern fishing area, is promising for the resumption of crab production in it. In addition, fishery the red king crab in the western part of coast of the Barents Sea will provide additional data on the impact of fishing on the stock, which will be used in fisheries management. In the near future, it is advisable to consider the possibility of changing the by-catch limit for non-commercial individuals when mining in the coastal area, as well as the possibility of allocating the Varanger-Fjord the red king crab as a separate management unit within a single reserve. Prior to receiving new data, it is possible to recommend that no more than 0.6 thousand tons of the red king crab in the Varanger-Fjord area.

Increase the production of giant mud crab (Scylla serata) through the Bieng Samudra Cage in Pauh Tanjung Village River Farmer Group, Langsa City

Potential for the development of the mangrove crab business in the coastal area of the city of Langsa, which has a fairly large mangrove forest area and produces abundant mangrove crab resources. However, some of the results of the study stated that the exploitation and the absence of restrictions on the size of the capture of mangrove crabs resulted in a decrease in the number of catchments by fishermen because the condition of crab stock in nature has decreased. The purpose of dedication is to provide education and training to fishermen about selling mangrove crabs, which is more prioritized than fattening results from direct catches from nature, and to increase the production of mud crabs by utilizing local materials. The next goal is the management of crab capture. Implementation of dedication is carried out through socialization and training for coastal communities and fishermen in Sungai Pauh Tanjung Village, Langsa City. The results of the implementation of community service activities contribute to increasing skills and added value, as well as increasing the production of mangrove crabs through the use of Samudra being cages and the use of local materials as potential feed for fattening mangrove crabs before being sold at the market.

Virus discovery in cultured portunid crabs: Genomic, phylogenetic, histopathological and microscopic characterization of a reovirus and a new bunyavirus

Portunid crabs are distributed worldwide and highly valued in aquaculture. Viral infections are the main limiting factor for the survival of these animals and, consequently, for the success of commercial-scale cultivation. However, there is still a lack of knowledge about the viruses that infect cultured portunid crabs worldwide. Herein, the genome sequence and phylogeny of Callinectes sapidus reovirus 2 (CsRV2) are described, and the discovery of a new bunyavirus in Callinectes danae cultured in southern Brazil is reported. The CsRV2 genome sequence consists of 12 dsRNA segments (20,909 nt) encode 13 proteins. The predicted RNA-dependent RNA polymerase (RdRp) shows a high level of similarity with that of Eriocheir sinensis reovirus 905, suggesting that CsRV2 belongs to the genus Cardoreovirus. The CsRV2 particles are icosahedral, measuring approximately 65 nm in diameter, and exhibit typical non-turreted reovirus morphology. High throughput sequencing data revealed the presence of an additional putative virus genome similar to bunyavirus, called Callinectes danae Portunibunyavirus 1 (CdPBV1). The CdPBV1 genome is tripartite, consisting of 6,654 nt, 3,120 nt and 1,656 nt single-stranded RNA segments that each encode a single protein. Each segment has a high identity with European shore crab virus 1, suggesting that CdPBV1 is a new representative of the family Cruliviridae. The putative spherical particles of CdPBV1 measure ∼120 nm in diameter and present a typical bunyavirus morphology. The results of the histopathological analysis suggest that these new viruses can affect the health and, consequently, the survival of C. danae in captivity. Therefore, the findings reported here should be used to improve prophylactic and pathogen control practices and contribute to the development and optimization of the production of soft-shell crabs on a commercial scale in Brazil.

Enhancement of NETosis by ACE2-cross-reactive anti-SARS-CoV-2 RBD antibodies in patients with COVID-19.

High levels of neutrophil extracellular trap (NET) formation or NETosis and autoantibodies are related to poor prognosis and disease severity of COVID-19 patients. Human angiotensin-converting enzyme 2 (ACE2) cross-reactive anti-severe acute respiratory syndrome coronavirus 2 spike protein receptor-binding domain (SARS-CoV-2 RBD) antibodies (CR Abs) have been reported as one of the sources of anti-ACE2 autoantibodies. However, the pathological implications of CR Abs in NET formation remain unknown. In this study, we first assessed the presence of CR Abs in the sera of COVID-19 patients with different severity by serological analysis. Sera and purified IgG from CR Abs positive COVID-19 patients as well as a mouse monoclonal Ab (mAb 127) that can recognize both ACE2 and the RBD were tested for their influence on NETosis and the possible mechanisms involved were studied. An association between CR Abs levels and the severity of COVID-19 in 120 patients was found. The CR Abs-positive sera and IgG from severe COVID-19 patients and mAb 127 significantly activated human leukocytes and triggered NETosis, in the presence of RBD. This NETosis, triggered by the coexistence of CR Abs and RBD, activated thrombus-related cells but was abolished when the interaction between CR Abs and ACE2 or Fc receptors was disrupted. We also revealed that CR Abs-induced NETosis was suppressed in the presence of recombinant ACE2 or the Src family kinase inhibitor, dasatinib. Furthermore, we found that COVID-19 vaccination not only reduced COVID-19 severity but also prevented the production of CR Abs after SARS-CoV-2 infection. Our findings provide possible pathogenic effects of CR Abs in exacerbating COVID-19 by enhancing NETosis, highlighting ACE2 and dasatinib as potential treatments, and supporting the benefit of vaccination in reducing disease severity and CR Abs production in COVID-19 patients.

Soft-Shell Production of the Invasive Atlantic Blue Crab Callinectes sapidus in the Lesina Lagoon (SE Italy): A First Assessment

The current invasion of the Mediterranean Sea by the Atlantic blue crab Callinectes sapidus requires the implementation of effective strategies of control and management. In native areas, the species is highly appreciated as a hard- and soft-shell seafood, and hard-shell fisheries are developing in a number of invaded countries. Here, to verify alternative approaches for enhancing the commercial value of the species, we carried out a pilot experiment to test a flow-through system for the production of soft-shell blue crabs. Fifty crabs were collected in the Lesina lagoon (Adriatic Sea, Italy) and inspected for the coloration of the line on the distal edge of the fifth pereiopod. Accordingly, they were grouped into three groups showing no, white, and red lines, symptomatic of the progression of the pre-molt phase, and maintained for 31 days in a flow-through pond system. The overall mortality rate determined during the trial was similar across the three groups and ranged between 10 and 20%, indicating that the flow-through system was effective for rearing the crabs. In addition, the molting rate was 10%, 65%, and 85% for individuals at an early, intermediate, and advanced pre-molt stage, confirming that the line coloration can be used as an effective indicator of the advancement of the molting process. Our study provides the first contribution towards the introduction in the Mediterranean fishery sector of novel procedures and practices for the production of soft-shell blue crabs, which may represent a cost-effective strategy to enhance the capture and commercialization of this invasive species as a high-quality and valuable shellfish product.

Modified mangrove pens for polyculture system in mud crab (Scylla serrata) and milkfish (Chanos chanos) production

The mangrove pens were modified to produce mud crab (Scylla serrata) and milkfish (Chanos chanos) in a polyculture system. The modification of mangrove pens was done by adding excavations inside the pen. The water quality parameters (dissolved oxygen (DO), pH, salinity, and temperature) were monitored, and the recovery and production rates in each pen were evaluated. The experiment was conducted for a rearing period of 143 days in nine mangrove pens, each having an area of 32 m2 and an average net enclosure height of 3 m from the soil surface. The three different pens constructed (existing design: canal only, 43% excavation by area, and 54% excavation by area) were designated as T1, T2, and T3, respectively. The water quality parameters recorded in the pens were favorable for the growth and recovery of the mud crab and milkfish, except for DO. For mud crab, the highest mean recovery was recorded in T2, followed by T3, and the lowest in T1. The production rate followed the same pattern as the recovery, with T2 having the highest, followed by T3, and T1 having the lowest. The statistical analysis revealed that the variations in mud crab recovery were not significant, while in terms of production rate, modified mangrove pens were found to be more effective than the existing design. Due to the total mortality of the cultured milkfish, the current set-up of modified mangrove pens was found to be unsuitable for the polyculture system of milkfish and mud crab production.

Effects of Antarctic Krill Meal in Diet on Reproductive Performance and Embryo Quality of Eriocheir sinensis.

A 60-day feeding trial was conducted to evaluate the impact of dietary Antarctic krill meal on the reproductive performance and embryo quality of the Chinese mitten crab, Eriocheir sinensis. Three diets were formulated, incorporating varying levels of Antarctic krill meal at 0% (Diet K0), 10% (Diet K10), and 20% (Diet K20), with a control group fed razor clam Sinonovacula constricta. Each diet was randomly assigned to three replicate tanks, each stocked with 5 males and 10 females. Male and female weights were 145.38 ± 8.01 and 102.57 ± 9.73 g, respectively. The results revealed no significant differences in weight gain rate, specific growth rate, and survival rate. However, the hepatopancreatic weight and hepatopancreas index of female crabs in each group decreased, while gonadal weight and gonadosomatic index increased significantly after 60 days, with Diet K20 showing the highest values. Egg production and fecundity of female crabs reached their peak in Diet K20, with no significant differences in reproductive indices among all groups. The phospholipid content in Diet K20 was significantly higher than in the other groups (P < 0.05). Cholesterol contents in Diet K0 and the control group were significantly higher than in Diet K10 and K20 (P < 0.05). No significant differences were observed in egg diameter, egg weight, moisture, crude protein, and crude fat between the groups. The content of C20 : 2 and C20 : 4n6 was highest in Diet K0, with a significant difference compared to Diet K10 (P < 0.05). However, no significant differences were found in the total content of saturated fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids among all groups. Based on the research findings, it is recommended that the optimal level of Antarctic krill meal in diets is 20%.

Crab Monitoring System (CMS) using Internet of Things (IoT’s)

Mangrove crabs are one of the leading fishery commodities with high economic value and have the potential to remap the direction of industrial development that combines ecological, social and economic interests. The majority of mud crab demand is met from natural fishing (±61.6%). One of the crises in mud crab production is related to the low cultivation capacity (±38.4%), even though new techniques have emerged in crab cultivations. This IoT-based water quality monitoring system was developed with a transmiting and receiving system. The Transmitting system is equipped with essential sensors needed for crabs to grow, such as sensors for air temperature, water temperature, humidity, pH, DO, and tides. The receiving system can displayed the data and transmit to the cloud and data processed by other users according to their scientific field.

The Investigation of the Amount of Blue Crab Production Regarding Other Crustaceans and Molluscs’ Farming in Türkiye

The aim of this study was to examine the factors affecting the catch rate of crustaceans and molluscs and to determine the effect of factors affecting the catch rate of blue crab. In this study, data of 14 variables (octopus, lobster, black mussel, etc.), total crustacean and mollusc content and total freshwater fish were examined from the crustaceans and molluscs caught from the TUIK website between 2012-2021. In addition to the comparison of these amounts, variables such as renewable water resources per capita, renewable surface water, total water withdrawal per capita, and water withdrawal for aquaculture were included in the study. Finally, the study was concluded by comparing seafood, aquaculture and freshwater products. The relationships between blue crab and other crustaceans and molluscs, water related statistics, aquaculture statistics were examined by regression analysis. As a result of the analyzes made, other creatures that affect the hunting rates of the blue crab; It was concluded that there is a category of jumbo shrimp, cuttlefish and other. At the same time, it was concluded that the total amount of fresh water and the amount of freshwater products affect the catch rate of the blue crab.

Pilot Scale Assessment of High-Pressure Processing (HPP) to Enhance Microbiological Quality and Shelf Life of Fresh Ready-to-Eat (RTE) Blue Crab Meat.

Blue crab (Callinectes sapidus) is a highly valuable wild fishery species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico. The annual commercial production of live blue crabs is approximately 50,000 metric tons with a dockside value of USD 200 million. Presently the US blue crab processing industry sells crab meat in three basic forms: fresh crab meat, pasteurized crab meat, and frozen crab meat. By far "Fresh" is the most desirable form of crab meat. However, fresh crab meat has a limited shelf life. This study evaluated the effects of high-pressure processing (HPP) on enhancing the microbiological quality and shelf life of blue crab meat. Live blue crabs were pressure-cooked in a retort (≥115 °C for 4-6 min). The crab meat was handpicked, packed in plastic containers with seals, subjected to HPP treatment, and stored at 4 °C. Container integrity and water leakage issues were examined by observation in addition to weight comparison before and after HPP treatment; the shelf life of crab meat with and without HPP treatments was examined via microbiological tests and sensory evaluations. Results show that polypropylene containers sealed with 10K OTR (oxygen transmission rate) film could withstand high pressure without water leakage issues; HPP treatment at 600 MPa for 3 min could extend the shelf life of fresh, cooked, and handpicked crab meat from 6 days to 18 days based on the strictest APC (aerobic plate account) limit (APC ≤ 100,000 CFU/g). The sensory quality of the HPP-treated crab meat was well accepted throughout the 3-week storage period. The results support the use of HPP as an effective non-thermal processing technology to enhance the microbiological quality and extend the shelf life of fresh RTE blue crab meat.

Sustainability for stakeholders and the environment? Understanding the role of geographical indications in sustaining agri-food production

The literature presents a debated discourse on the promotion of sustainable food production through Geographical Indications (GIs) certification. This study investigates the role of GIs in sustaining agri-food production based on a qualitative case study of hairy crabs with GIs in Suzhou, China. I collected secondary documents and conducted participant observation and interviews with food producers, food consultants, tour operators, and government officials. The findings suggest that, although the potential of GIs to expand agricultural economic prospects is probed, the increasing economic value of hairy crabs, especially those designated as GIs, incentivises farmers to expand crab breeding zones. This expansion, accompanied by animal feed, caused water pollution. The government's protective measures are meant to preserve the ecosystems. However, these measures have resulted in social inequalities in that some farmers are excluded from the production and distribution of lake crabs, and the local industrial chain is somewhat disrupted. These findings are discussed by linking to the previous studies, thus enriching the literature on GIs.

PELATIHAN PENGGUNAAN CRAB BOX PADA PEMBESARAN KEPITING BAKAU DESA KAJUARA KABUPATEN BONE

The method of cultivating mud crabs in Kajuara Village is still carried out traditionally and uses natural food, thus affecting the production of crabs which are not uniform in terms of size and weight. Apart from that, there is still a lack of partner knowledge regarding the behavior and habits of mud crabs as well as appropriate methods for cultivating mud crabs. The aim of this service is to increase the knowledge and skills of cultivators in cultivating mud crabs using crab boxes. The stages of implementing service activities include: 1) Survey and interview stage, 2) preparation stage, 3) implementation stage and 4) evaluation stage. Based on the achievements of the service activities, participants have knowledge and skills in the mud crab cultivation method using a crab box.

Improving size and selectivity of blue swimming crab (Portunus pelagicus) by using collapsible trap with escape vents in Pamekasan, Madura Island

Blue Swimming Crab (Portunus pelagicus) is high export value product from Indonesia that usually exported as pasteurized crabmeat in cans, and has high consumer demand. Blue swimming crab production still depends on wild catch, so that it will threaten the existence of them in the sea. The use of traps will cause almost all sizes of blue swimming crabs to be caught (accidentally) including those that are still small (not suitable for catching). This study aims to analyze the effectiveness of the escape vent in collapsible traps to reduce small catches of blue swimming crabs in the Pamekasan area. This research was carried out from August 2021 - January 2022 in the southern waters of Pamekasan. The method used is descriptive analysis and the effectiveness analysis of collapsible traps with a size (length x width) of escape vents is 4,5 x 3,5 cm. The study carried out 106 females and 85 males with a total weight of 22,908 kg and the carapace width ranged from 9,7 to 15,8 cm. The effectiveness of escape vents is 98,65%, which is the higher value (closer to 100%) the more benefits it will give to sustainability of blue swimming crabs in the Pamekasan area.

Trace elements accumulation and health risk assessment of Chinese mitten crab (Eriocheir sinensis) from monoculture and rice-crab co-culture mode

The rice-crab co-culture system has become the dominant mode of farming due to its advantageous production of crabs. To investigate the effects of different culture modes on trace element accumulation and health risks though consumption, we determined the concentrations of 16 trace elements (Ag, Al, As, Ba, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Se, Tl, V, Zn) in Chinese mitten crabs (Eriocheir sinensis) from conventional monoculture (CM) and rice-crab co-culture system (RCCS) in two primary producing areas of China. Significant variations were found between CM and RCCS concerning trace element accumulation, with most trace elements showing higher levels in CM than in RCCS, except for Mn and Al. Correlation and PCA analysis indicate that RCCS has less environmental impact than CM. Moreover, the metal pollution index was also higher in CM than in RCCS. Based on the target hazard quotient (THQ), RCCS reduces the health risk associated with trace elements intake compared to CM. THQ values for both modes of culture are less than 1, indicating no or low health risks posed by trace elements in crabs. Further studies are needed in comparing the trace element accumulation in crabs from CM and RCCS within the same geographic area.

PRODUCTION AND INCOME ANALYSIS OF MANGROVE CRAB (Scylla serrata) FARMING IN TANJUNG REJO VILLAGE PERCUT SEI TUAN DISTRICT DELI SERDANG DISTRICT

Analysis of Production and Revenue of Mangrove Crab Pond (Seylla serrata) Tanjung Rejo Village, Percut Sei Tuan District, Deli Serdang Regency”. The purpose of this study was to analyze the effect of the production factors of pond area, seeds, feed and labor on the production of mud crabs. The selection of research locations was carried out purposively. data collection by distributing questionnaires and interviews. The data sources used are primary data sources and secondary data sources, the sampling method in this study is to use the saturated/census sample method, namely by taking the entire population as a sample. The results showed that the variables of land area and seeds had a significant effect on the production of mud crabs, while the variables of feed and energy did not significantly affect the production of mud crabs. The business income from mangrove crab enlargement in the research area is Rp. 12,503,903.5. with a production period of 3 months. Where the revenue from the mangrove crab enlargement business is Rp. 20,004,736.9 and a total cost of Rp. 11,145,570,16.

Erratum: Eyestalk Ablation to Increase Ovarian Maturation in Mud Crabs.

Erratum: Eyestalk Ablation to Increase Ovarian Maturation in Mud Crabs.