fishery observer Articles
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Bioaccumulation of decamethylpentacyclosiloxane (D5): A review
Decamethylpentacyclosiloxane (D5) is a widely used, high–production volume personal care product with an octanol–water partition coefficient (log KOW) of 8.09. Because of D5's high KOW and widespread use, it is subject to bioaccumulation assessments in many countries. The present study provides a compilation and an in‐depth, independent review of bioaccumulation studies involving D5. The ...
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Predation of Northern Pike (Esox lucius L.) Eggs: A Possible Cause of Regionally Poor Recruitment in the Baltic Sea
Northern pike (Esox lucius) spawning habitat and egg mortality were studied in three spawning areas in 2001 along the Swedish coast of the Baltic proper: the Blekinge Archipelago, Kalmar Sound and coastal freshwater streams. Spawning peaked during the last week of April in streams, at temperatures ranging from 7.7 to 8.9 °C and during the first week of May in brackish waters, at temperatures ...
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Anti‐anxiety drugs and fish behaviour: Establishing the link between internal concentrations of oxazepam and behavioural effects
Psychoactive drugs are frequently detected in the aquatic environment. The evolutionary conservation of the molecular targets of these drugs in fish suggest that they may elicit mode‐of‐action mediated effects in fish as they do in humans, and one the key open question is at what exposure concentrations these effects might occur. In the present study, we investigated the uptake and tissue ...
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Biochemical effects of petroleum exposure in hornyhead turbot Pleuronichthys verticalis) exposed to a gradient of sediments collected from a natural petroleum seep in CA, USA
Untitled Document Concentrations of serum/plasma estradiol, biliary fluorescent aromatic compounds (FACs), levels of hepatic CYP1A expression, and DNA damage were measured in sexually mature hornyhead turbot (Pleuronichthys verticalis) exposed in the laboratory for 7 days to a gradient of sediments collected from a natural petroleum seep in the Santa Barbara Channel. Coal oil ...
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Toxic concentrations in fish early life stages peak at a critical moment
During the development of an embryo into a juvenile, the physiology and behavior of a fish change greatly, affecting exposure to and uptake of environmental pollutants. Based on experimental data with sole (Solea solea), an existing bioaccumulation model was adapted and validated to calculate the development of concentrations of persistent organic pollutants in the tissue of developing fish. ...
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Hexabromocyclododecane in consumer fish from South China: Implications for human exposure via dietary intake
Levels of hexabromocyclododecane (HBCD) were determined in 12 consumer fish species from South China. The concentrations of the sum of HBCD diastereoisomers (ΣHBCD) ranged from nondetectable to 194 pg/g wet weight, with a detectable frequency of 70%. This was at the low end of the concentration range globally observed. Carnivorous fish species contained higher HBCD concentrations than herbivorous ...
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Effects of anionic polyacrylamide products on gill histopathology in juvenile rainbow trout (Oncorhynchus mykiss)
Anionic polyacrylamide (PAM) products are commonly used to remove suspended materials from turbid waters and to help mitigate soil erosion. In the present study, juvenile rainbow trout (Oncorhynchus mykiss) were exposed to between 3 to 300 mg/L of ten commercially available PAMS (Clearflow Water Lynx Polymer Log and Clearflow Soil Lynx Granular Polymer; Clearflow Enviro Systems Group Inc.) and ...
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Underwater Unmanned Aerial Vehicle-Future of Marine Fisheries
First of all, there is huge market space for underwater drone. In terms of Fisheries and aquaculture, China's aquaculture area is 8465,000 hectares, of which 27.38% is mariculture area and 72.62% is freshwater aquaculture area. There are 32,000 aquaculture farms in China, covering an area of 10 million hectares. It is necessary to check the temperature, salinity, PH value, dissolved oxygen of ...
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Case study: Fish farm
OverviewKfar Ruppin is one of the leading fish farming coops in Israel. Recent restrictions on water consumption and discharge have led the coop to consider semi intensive closed loop fish ponds. The main objectives in closed loop fish farming applications are prevention of Ammonia and Nitrite accumulation, and removal of suspended solids. Usually, the investment in a closed water cycle system ...
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floating fish feeds vs sinking feed pellets
Generally there is no nutritional difference between floating and sinking feed. Advantages of floating feed • High Nutrition Retention • Environment-friendly • Easy to Store • Best for a Young Fish Breed • Monitoring the fish Advantages of sinking feed • Better for fish who likes to live in bottom level of water. • Great for sky or pavid fish that are scared ...
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Transgenic fish are ready for us. Are we ready for them?
After decades of regulatory and legal challenges, AquaBounty aims to bring genetically engineered salmon to U.S. and Canadian markets next year. On a hill above the cold waters around Prince Edward Island, technicians painstakingly create fertilized Atlantic salmon eggs that include growth-enhancing DNA from two other fish species. The eggs will be shipped to ponds in the high rainforest of ...
By Ensia
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Challenges and opportunities for fisheries managers in developing countries: a case for economic eclecticism
Fisheries managers and advisors in developing countries face challenges that may be difficult to overcome, because they use doctrines, principles and models of management and economics that do not adequately explain the problems that need to be solved. This may perpetuate non-sustainable policies, because broader issues important to fisheries sustainability are not accounted for more eclectic ...
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