scholarly journals Increase of methane emission linked to net cage fish farms in a tropical reservoir

2021 ◽  
pp. 100287
Author(s):  
Marcelo Gomes da Silva ◽  
Fernanda G. Sampaio ◽  
Ricardo Hideo Taniwaki ◽  
Nathan Oliveira Barros ◽  
Plínio C. Alvalá ◽  
...  
Keyword(s):  
Methane Emission ◽  
Fish Farms ◽  
Tropical Reservoir ◽  
Net Cage ◽  
Cage Fish

scholarly journals Influence of net-cage fish farming on zooplankton biomass in the Itá reservoir, SC, Brazil

2012 ◽  
Vol 23 (4) ◽  
pp. 357-367 ◽  
Author(s):  
Bruna Roque Loureiro ◽  
Christina Wyss Castelo Branco ◽  
Evoy Zaniboni Filho
Keyword(s):  
Fish Farming ◽  
Dry Weight ◽  
Control Area ◽  
Zooplankton Biomass ◽  
Total Density ◽  
Total Zooplankton ◽  
Net Cage ◽  
Uruguay River ◽  
Cage Fish ◽  
Total Zooplankton Biomass

OBJECTIVES: This study aimed to verify the influence of net-cage fish farming on zooplankton biomass in the Itá reservoir (Uruguay River, Brazil). METHODS: Samples were collected monthly from October/2009 to May/2010 at the surface and at the bottom in two sampling stations, the net-cage area and in a control area using a Van Dorn bottle and a plankton net (68 µm). RESULTS: The Cladocera and Copepoda biomass was estimated by dry weight using a micro-analytical balance, and the Rotifera biomass by Biovolume. Total zooplankton biomass varied between 6.47 and 131.56 mgDW.m-3 Calanoida copepod presented the highest value of biomass (127.56 mgDW.m-3) and rotifers, despite having an important contribution to total density, showed a maximum biomass of 2.01 mgDW.m-3. Zooplankton biomass at the net-cage area surface was higher when compared with the control area during the months of October to January. However, the zooplankton biomass was similar at the bottom of the two areas throughout the studied period. From February until May, zooplankton biomass decreased in both sampling stations, a fact probably associated with the flushing of the reservoir, followed by an increase in water transparency and a decrease in chlorophyll-a concentration in the following months (February to May). CONCLUSIONS: The influence of fish farming on zooplankton biomass was detected at the surface of the net-cage area only from October to January. From February to May this influence was not found, probably by the influence of the flushing of the reservoir.

Benthic Respiration and Nutrient Release Associated with Net Cage Fish and Longline Oyster Aquaculture in the Geoje-Tongyeong Coastal Waters in Korea

2019 ◽  
Vol 43 (3) ◽  
pp. 589-601 ◽  
Author(s):  
Sung-Han Kim ◽  
Hyung Chul Kim ◽  
Sang-Hwa Choi ◽  
Won-Chan Lee ◽  
Rae-Hong Jung ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Nutrient Release ◽  
Benthic Respiration ◽  
Oyster Aquaculture ◽  
Net Cage ◽  
Cage Fish

Influence of some physico-chemical variables on wild fish richness beneath sea-cage fish farms in the Aegean Sea, Turkey

2020 ◽  
Vol 100 (7) ◽  
pp. 1171-1179
Author(s):  
Okan Akyol ◽  
Aytaç Özgül ◽  
F. Ozan Düzbastılar ◽  
Halil Şen ◽  
José M. Ortiz de Urbina ◽  
...  
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Fish Assemblages ◽  
Wild Fish ◽  
Light Transmittance ◽  
Fish Farms ◽  
Physico Chemical ◽  
Sea Cage ◽  
The Relationship ◽  
Cage Fish

AbstractThis study aims to determine the relationship between physico-chemical variables on a seasonal basis and wild fish assemblages beneath sea-cage fish farms. Assemblages of wild fish were counted monthly on two separate days at each of six fish farms between August 2015 and July 2017, by six rapid visual counts (RVC) in 5 minutes with scuba by two divers. Seawater samples were simultaneously taken by a Nansen bottle during the RVC from the fish farm barge. SST (°C), salinity (ppm), dissolved oxygen (mg l−1) and pH were measured by YSI multiparameter, while Secchi disk was also used for light transmittance. Wild fish species richness went up with increasing temperature and salinity in the Izmir region, however, this stopped at about 26°C and about 39 ppm. Wild fish richness increased when the DO was at a level of 7 mg l−1 and the pH at about 7.9 in Izmir. Between 10 and 20 m, light transmittance showed greater wild fish species richness in Izmir region. In contrast, the wild fish species richness of the Muğla region fluctuated more. In terms of wild fish species richness, these fluctuations increased with salinity and DO, while they decreased with SST, pH and light transmittance. However, the range of variation of the recorded physico-chemical variables is rather narrow. The results of the correlation matrix indicate that the relationship between wild fish species richness and pH and SST was statistically significant in Izmir region (P < 0.05).

Food composition of whiting Merlangius merlangus, captured around the sea-cage fish farms in Ordu, south-eastern Black Sea

2019 ◽  
Vol 99 (7) ◽  
pp. 1651-1659 ◽  
Author(s):  
Tuğçe Şensurat-Genç ◽  
Okan Akyol ◽  
Aytaç Özgül ◽  
Uğur Özden
Keyword(s):  
Black Sea ◽  
Food Composition ◽  
Control Site ◽  
Fish Farms ◽  
South Eastern ◽  
First Choice ◽  
Significant Difference ◽  
Merlangius Merlangus ◽  
Sea Cage ◽  
Cage Fish

AbstractThe food composition of whiting, Merlangius merlangus, caught around the sea-cage fish farms off the coast of Perşembe, was analysed and compared with the diet of whiting from a control site off the coast of Fatsa (Ordu Province, south-eastern Black Sea). A total of 815 stomach samples were collected during the study, and of these, 195 (23.9%) were empty. According to the percentage of relative importance index (IRI%), pellet food (47.8%) and Annelida (25%) were the main prey groups of whiting in the sea-cage fish farms area, while unidentified teleost (85.3%) and Engraulis encrasicolus (8.2%) were dominant in the control site. The other prey groups in both areas were Crustaceans (Mysidae, Amphipoda, Upogebia sp.), Sprattus sprattus and Gobius spp. Seasonally, pellet food was the most consumed food in all seasons, but Mysidae was the first preference of whiting around the sea-cage fish farms in spring. In the control site, unidentified teleost was the first preference in all seasons, except winter, where E. encrasicolus was the first choice, followed by crustaceans and S. sprattus in winter. Bray–Curtis analysis shows that seasonally, there is no significant difference in the sea-cage fish farms, while there is significant difference in the control site, and two-dimensional nMDS of IRI% revealed a clear separation between both sites. SIMPER analysis revealed that the most contributing factors to the differences between seasons were pellet food in the sea-cage fish farms, and E. encrasicolus in the control site.

scholarly journals Dolops carvalhoi as a vector of Epistylis sp. between cultivated and wild specimens of Oreochromis niloticus in Brazil

2019 ◽  
Vol 28 (2) ◽  
pp. 325-329
Author(s):  
Cibele Diogo Pagliarini ◽  
Lidiane Franceschini ◽  
Cristiéle da Silva Ribeiro ◽  
Rosilene Luciana Delariva ◽  
João Paulo de Arruda Amorim ◽  
...  
Keyword(s):  
Geographical Distribution ◽  
Oreochromis Niloticus ◽  
Production Systems ◽  
Preventive Measure ◽  
Fish Farms ◽  
Accidental Release ◽  
Parasite Specificity ◽  
Etiological Agents ◽  
Host Parasite ◽  
Cage Fish

Abstract Epistyliasis has been characterized as an emergent disease which has a great impact on fish farms, especially on Oreochromis niloticus production systems. Although epidemiological important, information about the dispersion of these parasites and their mechanical vectors is scarce. The present study reported the cooccurrence of Epistylis sp. as an epibiont of Dolops carvalhoi, a parasitic crustacean of cultivated/wild specimens (from accidental release) of O. niloticus from a cage fish farm area in the Ilha Solteira Reservoir, Grande River, SP, Brazil. The co-occurrence of Epistylis sp. and D. carvalhoi, and their epibiont relationship registered in this study suppose that the Epistylis may use the crustaceans for dispersion and as mechanical vectors for the dissemination of diseases in wild and cultivated hosts. Moreover, exchange of parasites between wild and cultivated hosts is possible, considering both organisms (protozoan and argulid). Furthermore, the results of the present study demonstrate the need to monitor the areas adjacent to cage fish farms as a preventive measure for the dispersion of pathogens. This is the first report of epibiosis between Epistylis sp. and argulid parasites of cultivated and wild O. niloticus, contributing to knowledge about host-parasite specificity, geographical distribution, dispersion of etiological agents and epidemiology in aquaculture.

scholarly journals Seasonal variations in wild fish aggregation near sea-cage fish farms in the Turkish Aegean Sea

2020 ◽  
Vol 18 ◽  
pp. 100478
Author(s):  
Okan Akyol ◽  
Aytaç Özgül ◽  
F. Ozan Düzbastılar ◽  
Halil Şen ◽  
José M. Ortiz de Urbina ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Aegean Sea ◽  
Wild Fish ◽  
Fish Farms ◽  
Fish Aggregation ◽  
Sea Cage ◽  
Cage Fish

scholarly journals Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms

2008 ◽  
Vol 65 (7) ◽  
pp. 1153-1160 ◽  
Author(s):  
Damian Fernandez-Jover ◽  
Pablo Sanchez-Jerez ◽  
Just Tomás Bayle-Sempere ◽  
Carlos Valle ◽  
Tim Dempster
Keyword(s):  
Fish Assemblages ◽  
Abundant Species ◽  
Stomach Content Analysis ◽  
Wild Fish ◽  
Seasonal Patterns ◽  
Fish Farms ◽  
Coastal Fish ◽  
Fish Stocks ◽  
Floating Structures ◽  
Cage Fish

Abstract Fernandez-Jover, D., Sanchez-Jerez, P., Bayle-Sempere, J. T., Valle, C., and Dempster, T. 2008. Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms. – ICES Journal of Marine Science, 65: 1153–1160. Fish are attracted to floating structures, including coastal cage fish farms, sometimes in dense aggregations. To understand better the influence of aquaculture on wild fish stocks, we carried out seasonal visual censuses around three southwestern Mediterranean farms over 2 years to assess the temporal patterns of the aggregated fish assemblage. In addition, we analysed the diet of the five most abundant species. Aggregations around all farms were large throughout the year, although species composition and abundance differed among farms and seasons. Fish farms are attractive habitats for certain species of wild fish in specific seasons. Adult fish of reproductive size dominated the assemblages, and stomach content analysis revealed that 66–89% of fish of the five most abundant taxa had consumed food pellets lost from the cages. We estimated that wild fish consume up to 10% of the pellets used at farms, indicating that food is a key attractant. Regional monitoring of farm-associated wild fish assemblages could aid management of the interaction of aquaculture and wild fish resources, because changes in feeding behaviour may have consequences for fish populations and local fisheries.

Changes in body condition and fatty acid composition of wild Mediterranean horse mackerel (Trachurus mediterraneus, Steindachner, 1868) associated to sea cage fish farms

2007 ◽  
Vol 63 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Damian Fernandez-Jover ◽  
Jose Angel Lopez Jimenez ◽  
Pablo Sanchez-Jerez ◽  
Just Bayle-Sempere ◽  
Francisca Gimenez Casalduero ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Body Condition ◽  
Horse Mackerel ◽  
Fish Farms ◽  
Sea Cage ◽  
Cage Fish

scholarly journals Prevalence and pathology of ectoparasites of Mediterranean fish, reared under three different environmental and aquaculture conditions in Greece

2017 ◽  
Vol 55 (3) ◽  
pp. 203 ◽  
Author(s):  
St. VAGIANOU (ΒΑΓΙΑΝΟΥ ΣΤ) ◽  
F. ATHANASSOPOULOU (Φ. ΑΘΑΝΑΣΟΠΟΥΛΟΥ) ◽  
V. RAGIAS (Β ΡΑΓΙΑΣ) ◽  
D. Di CAVE ◽  
L. LEONTIDIS (Λ. ΛΕΟΝΤΙΔΗΣ) ◽  
...  
Keyword(s):  
Sea Bass ◽  
Infected Fish ◽  
Sea Bream ◽  
Fish Farms ◽  
Factors Associated ◽  
Larval Stages ◽  
Severe Pathology ◽  
Mediterranean Fish ◽  
Cage Fish

Sea bream Spams aurata L. and sea bass Dicentrarchus labraxL. were sampled from three different locations in Greece (2 cage fish farms located in different geographic areas and a lagoon), in order to investigate the prevalence of Metazoa parasites, the intensity and the factors associated with the prevalence. In farm 1 (Eastern Greece) the prevalence of the ectoparasites was: 61.5% and 76.9% for Monogenea, 0% for Isopoda and 0% and 23% for Copepoda in sea bream and sea bass, respectively. In farm 2 the prevalence was: 13.3% and 26.3% for Monogenea, 13.7% and 20% for Isopoda and 0% and 13.6% for Copepoda in sea bream and sea bass, respectively. Lesions in the gills of Sparidae were due to monogeneans, but lesions in the skin and eyes were due to Ceratothoa oestroides larval stages causing severe pathology. Furnestinia. echeneis and Diplectanum aequans were host specific for sea bream and bass, respectively and showed persistence in all aquaculture systems. The Greek lagoon had the largest variety of parasites among the ecosystems studied, however, this variety did not significantly affect the health of infected fish. Lernanthropus kroyeri was host specific and was detected only in sea bass in both cage farms investigated.

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