Fish Caught Research Articles

НЕКОТОРЫЕ ПОКАЗАТЕЛИ НЕСПЕЦИФИЧЕСКОГО ИММУНИТЕТА ЛЕЩА САРАТОВСКОГО ВОДОХРАНИЛИЩА

The study of some parameters of nonspecific humoral and cellular immunity in sexually mature bream of the Saratov Reservoir was carried out. The fish were caught by bottom trawl in September 2019 during a complex hydrobiological expedition aboard the R/V “Akademik Topchiev” organized by the Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences. Trawling operations were performedt at three standard stations: 1 – Shiroky Buerak, 2 – Khvalynsk, 3 – Kashpir Rudnik. The first two stations were located in the lower reaches of the reservoir and the third one was in the central part. Fish blood was sampled from the tail vein to obtain serum and prepare smears for phagocytic activity of neutrophils. After autopsy, pieces of immunocompetent organs (kidney, spleen and liver) were also taken from the fish in dry sterile tubes. The level of antimicrobial properties and C-reactive protein of blood serum, nonspecific immune complexes in kidney, spleen and liver tissues were studied, the proportion of immunodeficient individuals and phagocytic activity of neutrophils were determined. The study established quantitative indicators of humoral and cellular immunity of bream of the Saratov Reservoir. The comparative analysis showed significant differences in antimicrobial properties of blood serum and the content of non-enzymatic cationic protein in lysosomes of neutrophils of peripheral blood in bream from the central part and the lower reaches of the reservoir. Fish caught in the central part of the reservoir were characterized by high level of bactericidal activity of blood serum and low level of phagocytic activity of neutrophils. The majority of the studied individuals had a positive level of C-reactive protein and unreliable differences in the content of IR in tissues and organs. The revealed differences are probably caused by the impact of different environmental factors on the bream organism.

Processing Fishery Products for Community Food Security at the East Kutai Regency

In order to increase the utilization of fisheries potential, it is necessary to diversify fish processing. East Kutai is a district that has the potential to produce fisheries, especially from fishing. The catch of sea fish and freshwater fish in East Kutai Regency in 2020 was 5,294 tons. Diversifying fish processing is one means of increasing community food security. The STIPER East Kutai Marine Science Study Program plays a role in helping the government to increase food security through exhibition activities at the "food and nutrition month" event with the theme of sustainable food security organized by the East Kutai Food Security Service. This activity is carried out as a form of community service in carrying out one of the Tri Dharmas of Higher Education. Processing of tuna and shrimp nuggets as a diversified fish processing product is presented to the public. At this event, people were also distributed selebarans about how to process fish into processed products. Community Service activities carried out for four days ran smoothly. The tuna and shrimp nuggets products presented were also subjected to organoleptic testing by exhibition visitors. Exhibition activities are very effective in disseminating knowledge on campus to be disseminated to the community.

Potentiality of natural live food organisms in shrimp culture: A review

The aquaculture industry is growing quickly due to increased fish consumption and a decline in wild fish catch. About half of the world's seafood demand for human consumption is now met by farmed seafood. The aquafeed market is expanding along with the aquaculture sector. Some of the elements in shrimp feed are derived from terrestrial plants and low-value forage fishes (fish meal). It is impossible to produce more fish meals since doing so would harm the ocean's environment and sustainability. The reduction in shrimp feed cost can also be done by introducing low-cost, environment-friendly ingredients in shrimp feed formulation. Therefore, new and ecologically friendly shrimp (Litopenaeus vannamei) feed component sources must be created. Live food organisms are a preferable option for this since they provide a variety of essential amino acids and beneficial triglycerides like fat, vitamins, and colors in their cell metabolites. Microalgae biomasses also represent feasible ingredients for shrimp feed sources. Their distinctive variety of bioactive chemicals can enhance color and pellet quality, act as a bulk element in shrimp feed, and boost the viability of farmed species. Live food organisms have a great economic potential since they have the highest biomass productivity of all photosynthetic organisms. In addition to giving farmers and exporters a better choice for feeding their fish, the availability of on-grown live food would also open up the prospect of improving the performance and quality of the fish and shrimp through bioencapsulation. This review study examines the possibility of generating natural food biomass as a component in shrimp feed.

The Uniqueness Of Kayie Dance Art In Village Laban Nagari Salido District IV Jurai Painan South Pesisir Based On Space, Time, And Energy Aspects

The traditional art of Kayie Dance in Laban Nagari Salido Village, IV Jurai Painan District, the South Pesisir is an identity for the life of the community itself, because this art reflects the activities of the South Coast community who work as fishermen. As a source of livelihood and fishing activities in the southern coastal area, the community believes in the value of life that comes from catching fish in the sea or river. Moving away from the values ​​of life, local artists have created art that is characteristic of the southern coastal area, especially in the village of Laban Nagari Salido, District IV Jurai Painan. The uniqueness of this art is that it combines beautiful and rhythmic movements, and each movement has its own beautiful value. The Kayie dance has its own uniqueness which is created by the dance atmosphere expressed through the dance movements. Kayie's dance has 11 main movements in the dance, starting with the initial sambah movement to the closing sambah movement. There are many aspects of beauty contained in every element of the Kayie Dance art. The function of the Kayie Dance is as a means of entertainment and learning for all levels of society, this is an attraction for the community to preserve the Kayie dance on the South Pesisir.

Assessment of Epizootic Ulcerative Syndrome (EUS) in Estuarine Fishes Collected from Arasalar Estuary, Puducherry State, India

Fishes form an important source of cheap protein for people of many countries. The majority of the global production comes from freshwater aquaculture (58%) followed by marine (36%) and brackish water (6%). With an average increase in aquaculture production of 11% during the last decade, aquaculture has become the fastest growing sector of the world food economy However, fish diseases is now posing a great threat to achieve maximum production and has become a limiting factor to the success of aquaculture. Among the various diseases, Epizootic Ulcerative Syndrome (EUS) is a disease affecting a wide range of wild and farmed freshwater and estuarine fish which has spread across south-east Asia and India. From the fish survey, Food Fishes were collected from the Arasalar estuary, Puducherry State, India. The fish caught were identified and average 200 species of each fish were examined for EUS (Epizootic ulcerative syndrome) infection for the four seasons of the year (Pre-summer, Summer, Post-summer and Rainy season). The results of the number of fishes with EUS that could be identified in the different seasons are reported. Of the 75 fishes, that were examined, 12 were affected with EUS. This shows that 16% of the fishes were subjected to infection.
 Among Lizaparsia, 11 species were infected representing 14.6% of infection and among Mystus, seven fishes were infected forming 9.3% of infection. With regard to Oreochromis mossambicus, only four species were infected forming 5.3% of infection. With regard to Glossogobius giuris, nine species were infected thus 12% of infection. Nevertheless, during this period, the range of infection ranged from nil to 16%.
 During the pre-summer season, the percentage of infection again ranged from nil but to 12%. The maximum infection was noticed in Liza parsia (9 fishes) representing 12% infection, Puntius filamentosus (8 fishes) recording 10.6% followed by Glossogobius and Mystus (8%) and Oreochromis mossambicus (1.33%) infection respectively. During the summer and the post-summer season, none of the fishes that were investigated recorded any signs of EUS. Thus, an overall comparison reveals that the highest percentage of EUS was recorded in the rainy season followed by the pre-summer season and least in summer and post-summer season.

Global trends of fronts and chlorophyll in a warming ocean

Ocean fronts affect phytoplankton and higher trophic levels, including commercially important fisheries. As the oceans warm, uncertainty remains around the trends in fronts. Here we examine changes in sea surface temperature fronts (frequency, density, and intensity) and the concentration of chlorophyll, over recent satellite records (2003 – 2020) in ocean warming hotspots - areas that are warming faster than other parts of the ocean. Commonalities exist across hotspots with comparable dynamics. Most equatorial and subtropical gyre hotspots experienced a decline in frontal activity (frequency, density, strength) and chlorophyll concentration, while in high-latitude hotspots, frontal activity and chlorophyll concentration mostly increased. Continued warming may accentuate the impacts, changing both total biomass and the distribution of marine species. Areas with changing fronts and phytoplankton also correspond to areas of important global fish catch, highlighting the potential societal significance of these changes in the context of climate change.

Effects of Land Reclamation Activities on Fish Catch Among Fishermen at Merambong Shoal, Johor

The fisheries community is a community that is highly dependent on the fisheries sector, and they usually live near the coastal area. However, land reclamation activities are conducted in the coastal area for development and urbanization due to the increasing population. Consequently, the land reclamation activities degraded the habitat of the fish and caused a decrease in their productivity. This study investigated the effects of land reclamation activities on fish catch among fishermen. Using convenience sampling, 79 fishermen in the Merambong Shoal were selected, and a structured questionnaire was constructed to get responses from these fishermen. Descriptive analysis, factor analysis, and multiple regression analysis were used to analyze the data. The study revealed that the number of trips, duration of fishermen to catch fish, distance of fishing ground from the coast, number of crew, and government incentives were the factors that affected the fish catch. These factors have significant relationships with the quantity of fish catch, which directly impacts income and, at the same time, affects livelihoods. The role of the government in increasing the monetary incentives and subsidies to improve the fishermen's fishing operations was highly recommended.

Forecasting of Seasonal and Cyclical Variations of fish catch from Egyptian Mediterranean Fisheries

Forecasting of Seasonal and Cyclical Variations of fish catch from Egyptian Mediterranean Fisheries

What Is El NiñO and How Will It Affect Us?

Imagine a fisherman back in 1726 who relied on catching fish to survive and support his family. When the number of fish went down for any reason, the family would suffer. In 1726, a change in the sea-surface temperature of the Pacific Ocean, which lasted many months, decreased the number of fish. Since then, similar observations have been made in the Pacific Ocean close to the equator. Today, the reasons for the changes in sea temperature are known as the El Niño-Southern Oscillation. It has been studied scientifically since the 1900s. But what is this circulation? In this article, we will explore it in detail and describe its relationship to changes in the environment.

Performance of sorting grids on catching elasmobranchs in a multispecies Mediterranean bottom trawl fishery

Elasmobranchs are among the most threatened long-lived marine species in the Mediterranean Sea. Incidental catch and intense fishing effort are considered the major threats to their conservation. To date, no Mediterranean countries has adopted specific technical measures within current conservation plans to mitigate potential impacts on vulnerable elasmobranchs. This study aimed to evaluate the effectiveness of new elasmobranch bycatch reducing devices (BRD) in a Mediterranean multispecies bottom trawl fishery (northern central Adriatic Sea, one of the most exploited basins in the Mediterranean). Specifically, two types of grids were tested: a novel shark excluder device (SED) and a flexible grid (Flexgrid). Effectiveness was evaluated in terms of bycatch and commercial catch reduction, relying on the different sizes of elasmobranchs and the main commercial species. Results showed that preliminary tests with SED were effective in excluding elasmobranch species. Catches made with this grid showed no significant difference for targeted crustacean (mantis shrimp, Squilla mantis), however, commercial losses were shown for some large bony fish. Flexgrid did not affect the catches of the main target species, such as the red mullet (Mullus barbatus), European hake (Merluccius merluccius) and mantis shrimp, but also retained small-spotted catshark (Scyliorhinus canicula). The effectiveness of the grids apparently was affected by the small size of the elasmobranchs captured. The study showed that SED and Flexgrid are valuable solutions for elasmobranchs if combined with other conservation measures (e.g. seasonal fishing closure in critical areas and good practices). Finally, strong cooperation between fishers, scientists, and managers is critical to identify the best management options in a regulatory framework where only a few elasmobranch species are formally protected. Interestingly, the study also yielded the identification of two potential aggregation-nursery areas for the small-spotted catshark (Scyliorhinus canicula) and the common smooth-hound (Mustelus mustelus).

Metals bioaccumulation in fish captured from Araguari River upper section (Amazon biome), and risk assessment to human health resulting from their consumption

BackgroundThe Araguari River is one of the most important rivers from Amapá State and its waters are essential as source of drinking water and food, especially for the traditional Amazonian populations. These populations have fish as their main protein source; however, studies have shown the metals bioaccumulation in fish caught in the Araguari River and the risks to human health resulting from fish consumption. Our objective was to investigate the bioaccumulation of Cd, Pb, Cr, Ni, Fe, Mn, Cu, Zn, and Hg in muscle tissue from the fish species Ageneiosus inermis and Hoplias aimara, and to evaluate the risks to human health resulting from their consumption. MethodsFish sampling was carried out between September and October 2018 at two sampling sites located in the Araguari River upper section. The metal concentrations quantification was performed by Atomic Absorption Spectrometry, except for Hg whose concentrations were determined using a hydride generator coupled to Inductively Coupled Plasma Optical Emission Spectrometry. For risk assessment of each metal individually we use the risk quotient (RQ) approach. To assess the risk of metal mixtures, present in fish muscle samples, we used the risk index (RI) approach. We also calculate the estimated daily intake (EDI). ResultsThere was no statistical difference in the bioaccumulation of metals between both fish species. Only Cd and Pb presented average concentrations higher than the maximum limits established by Brazilian legislation aimed at protecting human health. The RI values obtained for both fish species were > 25, which indicates high risks to human health. The EDI values obtained for Hg in both fish species exceeded their reference dose (RfD). Taken together, our results show that these fish species are unfit for consumption. ConclusionsBased on our results we recommend that the population does not consume the species A. inermis and H. aimara. When suspending consumption of both species is not possible, reducing their consumption is mandatory to reduce the exposure of human populations to toxic metals bioaccumulated in fish muscle tissue and thus reduce health risks.

Evaluating the long term effectiveness of a Mediterranean marine protected area to tackle the effects of invasive and range expanding herbivorous fish on rocky reefs

Here we provide evidence, along an 8-year period time-series based on multifaceted data from a Mediterranean marine protected area (MPA), whether protection can tackle invasive and range expanding herbivore fishes, and their effects on the algal resource availability, taking into account the population trends of predatory fishes, fisheries catches of herbivore fishes and sea surface temperature (SST) through time. Our findings pointed out that an ineffective in restoring top-down control process MPA may facilitate, rather than alleviate, the sudden and enduring population burst of invasive and range-expanding herbivorous fishes at tipping points of abrupt change. This subsequently results in the deterioration of rocky reef habitats and the depletion of algal resources, with the tipping points of abrupt change for algal and herbivore fish species not overlapping chronologically. As sea temperature increases, ineffective or recently established MPAs may inadvertently facilitate the proliferation of invasive and range-expanding species, posing a significant challenge to management effectiveness and conservation objectives.

Distribution of toxic and trace metals in fish from the Black Sea: Implications for human health risks

This study focused on the investigation of toxic and trace metal levels in fish caught from the Black Sea, which is facing pollution threats from various human activities. It also aimed to assess the potential health risks associated with consuming fish and contribute to the development of strategies for sustainable fisheries management. Metal presence was observed in the muscle tissues of four commercially consumed fish species (anchovy, whiting, horse mackerel and red mullet) from nine different stations in the Black Sea. Among the metals, the highest average concentration was observed for aluminium (Al) in anchovy and the lowest concentration for cadmium (Cd) in whiting. However, the levels were generally below the maximum allowable limits recommended by the FAO, WHO, EC, and Turkish Food Codex. The study results showed that metal concentrations in the analyzed fish species did not pose significant non-carcinogenic health risks to consumers. Although research findings show that some fish species studied from the Black Sea exhibit high metal levels, the concentrations of toxic and trace elements are generally within acceptable thresholds for safe fish consumption. The findings of this study are thought to help stakeholders develop strategies for environmental protection and sustainable fisheries management in the region.

Correction of Italian under-reporting in the first COVID-19 wave via age-specific deconvolution of hospital admissions

When the COVID-19 pandemic first emerged in early 2020, healthcare and bureaucratic systems worldwide were caught off guard and largely unprepared to deal with the scale and severity of the outbreak. In Italy, this led to a severe underreporting of infections during the first wave of the spread. The lack of accurate data is critical as it hampers the retrospective assessment of nonpharmacological interventions, the comparison with the following waves, and the estimation and validation of epidemiological models. In particular, during the first wave, reported cases of new infections were strikingly low if compared with their effects in terms of deaths, hospitalizations and intensive care admissions. In this paper, we observe that the hospital admissions during the second wave were very well explained by the convolution of the reported daily infections with an exponential kernel. By formulating the estimation of the actual infections during the first wave as an inverse problem, its solution by a regularization approach is proposed and validated. In this way, it was possible to compute corrected time series of daily infections for each age class. The new estimates are consistent with the serological survey published in June 2020 by the National Institute of Statistics (ISTAT) and can be used to speculate on the total number of infections occurring in Italy during 2020, which appears to be about double the number officially recorded.

Assessing the influence of artisanal fishing on income and livelihood of the coastal communities in Tanzania: the case of Mkinga district, Tanga region

This study unveiled the influence of artisanal fishing on a coastal community's income and livelihood in the Mkinga District, Tanga region. Particularly, it seeks to: determine fish catch and gross margins across, investigate the influence of fish income on the households total incomes, and factors affecting income earnings in the marketing chain. The study used interviews and focus group discussions on obtaining primary data. Simultaneously, the internet, government documentation units at different levels were the sources of secondary data. It involved a total of 125 randomly selected respondents. Moreover, Gross Margin (GM), Marketing Margin (MG), and Statistical Package for Social Sciences (IBM SPSS Statistics 25) were employed for analysis.Results show the socio-economic status of the respondents was generally poor. The majority of fishers have low education levels (44%), and they depend on fishing for livelihoods. Furthermore, compared to other groups computation of gross margins revealed that artisanal fishers earned the lowest (12.2%) with a gross margin of T.shs 443.6. Despite the lowest gross margin earning than other players, the fish income contributes highly (83.8%) to the total household incomes. Therefore, improvement in the fisheries sector results has a high impact on artisanal fishers' wellbeing. Moreover, factors affecting their income include lack of credit to purchase modern fishing and storage equipment, high cost of fishing gear, poor roads, low bargaining power, inadequate extension services, and lack of market information. Hence, the study recommends the government address observed constraining factors affecting artisanal fishers' incomes to increase their incomes

"It's Incapacitated Me in so Many Ways": Older Adults' Lived Experience With Postoperative Symptoms at Home After Major Elective Surgery.

This qualitative study aimed to explore the challenges faced by older adults regarding the postoperative symptom experience after major elective surgery. Although extensively studied in oncology settings, the impact of postoperative symptom burden remains largely underexplored in elective major surgery among older adults. We employed convenience sampling to recruit adults aged 65 years or above undergoing major elective surgery at the University of California, San Francisco. Semistructured interviews regarding the surgical experience were conducted at 1 and 3 months postoperatively. An inductive qualitative approach was used to identify emerging themes. Symptoms revealed by participants during interviews were also captured. Nineteen participants completed a 1-month postoperative interview, and 17 additionally completed a 3-month interview. Three themes emerged: (1) postoperative symptoms significantly impacted valued life activities and psychosocial well-being, (2) participants felt "caught off guard" by the intensity and duration of postoperative symptoms, and (3) participants expressed the need for additional support, resources, and education on symptom management. The most frequently mentioned symptoms were postoperative pain (n=12, 63.1%), gastrointestinal discomfort (n=8, 42.1%), and anxiety/stress (n=8, 42.1%) at 1-month postsurgery compared with pain and depression (both n=6, 35.3%) at 3 months. Study participants were surprised by the negative impact of postoperative symptoms on their psychosocial well-being and ability to engage in valued life activities. Symptom burden is an important patient-reported outcome that should be assessed postoperatively. Interventions to minimize postoperative symptom burden in older adults could optimize quality of life and participation in meaningful activities during surgical recovery.

First record of the megamouth shark Megachasma pelagios (Lamniformes: Megachasmidae), from the United Republic of Tanzania.

The megamouth shark Megachasma pelagios (Lamniformes: Megachasmidae) was described in 1976 from a specimen caught off Hawaii (Taylor et al. 1983) and is the only extant member of its family and genus (Diez et al. 2022). From 1976 to 2010 M. pelagios was considered rare, with only 50 individuals recorded globally during that time (Nakaya 2010). In recent years it is apparent that it is more common and widespread than previously thought, with 273 confirmed records to date across 16 countries in the Atlantic, Indian and Pacific Oceans (Yu et al. 2021; Diez et al. 2022; Skelton et al. 2023). This species is classified as Least Concern on the IUCN Red List of Threatened Species, as it is globally distributed and does not appear to be heavily impacted by fisheries (Kyne et al. 2019).

Ecosystem Characteristics and Trophic Model of the Artificial Reef Ecosystem in the Sea of Oman, Sultanate of Oman

This study aimed to understand the structure and function of the artificial reef ecosystem of the Sea of Oman and its stability and maturity. For this study, the trophic model of the Sea of Oman’s artificial reef ecosystem was described using the Ecopath with Ecosim (EwE) ecosystem modeling software (Version 6.6.7). The essential characteristics of the aquatic system were identified using a total of 38 fish species/functional groups, spread across an area of 140 km2 of artificial reef farm. The mean trophic level of the artificial reef ecosystem of the Sea of Oman was 3.039. Sharks were the keystone species of the studied ecosystem. Heniochus acuminatus and Chaetodon gardneri were the species with the highest niche overlap, whereas Acanthurus sohal and other crustaceans, and Terapon puta and Saurida undosquamis were the species with the lowest niche overlap. It was found that the ratio of total primary production to total respiration of the ecosystem studied was more than one, indicating that the system produces more energy than it uses to respire, and the ecosystem of the Sea of Oman can be regarded as a developing system because of its low degree of stability and maturity. The omnivory index was 0.260, the connectance index was 0.159, the total biomass to total throughput ratio was 0.006, Finn’s cycling index was 5.41, the total primary production to total biomass ratio was 64.895, and the total primary production to total respiration ratio was 4.424. The results indicate that the artificial reef ecosystem in the Sea of Oman can be categorized as immature (in the early developmental stage). Further study is needed to improve the input data and track ecosystem health, as well as exploring other management strategies. Based on the outcomes of the study, it is suggested that environmental management of the reef ecosystem, along with the fish catch data, should be taken into consideration for future research.

Estimating recreational trap‐fishing effort for crayfish from zig‐zag line transects, drone surveys and enforcement surveys

AbstractEstimates of recreational fishing effort and catch are needed to inform fisheries management, but such estimates can be challenging to obtain. We combined a zig‐zag line transect survey of buoys, a fisheries enforcement survey and a drone survey to estimate recreational effort in the open‐access trap fishery for signal crayfish (Pacifastacus leniusculus) in the sixth largest lake in Europe, Lake Vättern, Sweden. Using supporting variables such as size of nearby ports and bathymetry, our model‐assisted estimate of total effort was 6400 (±4300 CI) buoys during the three‐weekend season. Using the frequency of buoys to traps as a constant, the total number of crayfish traps was estimated to be 25,500 (±17,000 CI). The sampling design and methods presented are useful for ecologists and resource managers to design future multi‐source surveys of recreational trap fishing effort.

Profile of fisheries capture in Cikidang Fish Landing Base (PPI), Pangandaran, West Java Study 2017-2021 and its potential utilization for fisheries product processing industry

Fishing activities in Pangandaran Regency are centered in Cikidang Fish Landing Base (PPI), Babakan Village, Pangandaran Sub-district, Pangandaran Regency, West Java Province. The research objective is to identify the fishing profile in Panagandaran Sub-district during 2017-2021 and identify its potential utilization for the fishery product processing industry. The research method is descriptive data collection. The research location is in Pangandaran sub-district. Data taken are secondary and primary data from 2017-2022. Respondents are Joint Business Groups (KUB) based on Cikidang PPI, Pangandaran Regency Marine Fisheries and Food Security Office, Head of Cikidang PPI, and Pangandaran District village leaders. The results of the study identified the age profile of respondents aged 55-59 years (55%), basic education level (75%), 31-35 years of fishing experience (25%), no side job (85%), monthly income of 1-2 million (60%). The types of fishing gear used by fishermen are Vessel Seine, Drift Net, Liong Bun, Hand Line and seser. The dominant types of fish catches in a row from the highest in 2017 to 2021 are Rebon Shrimp, Yellowfin Layur, Krosok Shrimp, Dogol Shrimp, White Bawal and fish bycatch. By-catch fish are in the top 4 most abundant fish caught using vessel seine and drift net gear. Most of the by-caught fish from middlemen are made into salted fish. Fishing activity decreased in 2020-2021, but the value of fishing production increased. The utilization of caught fish is mostly salted fish, yet to be utilized for the fishery products industry.