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Showing 1 to 15 of 15 for “"Fish survival"”.
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Wind induced entrainment in the Strait of Georgia and the possible consequences for fish survival
… that wind induced entrainment enhances the survival of fish which spend their early lives in the area, by supplying nitrate rich deep water to the photic zone and increasing primary productivity. Historical records of winds and Fraser River discharge were used to drive the combined GF4/MULES …
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Distribution of larval fishes in the Winfield Pool, Kanawha River, and direct impacts of commercial navigation traffic on larval fish survival
Distributions of larval fishes in the Winfield Pool, Kanawha River, West Virginia, were determined by sampling two sites with bongo and push nets. Cyprinids, clupeids, and <i>Aplodinotus grunniens</i> dominated collections. Main channel densities were a fraction of the densities along the …
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An examination of differential survival in downstream migrating coho salmon smolts
… smolts high in the watershed and recapturing the fish near the ocean. Four study sites were used, two in the upper watershed and two in the lower watershed. At both distances, lake-type and stream-type habitats were sampled. Factors which were found to influence survival included: 1) distance of …
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An Ecological Approach to Feed Management in Fish Rearing Ponds
Channel catfish (Ictalurus punctatus) has been the most important cultured fish in the United States by yield and commercial value for the past 60 years, and at least 31 states stock this species into lakes and reservoirs as a sportfish. Catfish culturists have historically used a “black box” …
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Deepwater Horizon Impacts on the Diet, Growth, and Condition of Larval Spanish Mackerel (<i>Scomberomerus maculatus</i>)
… of many valued commercial and recreational fishes in the northern Gulf of Mexico. Larval fish survival and eventual recruitment into adult populations may have been impacted by changes in the planktonic food web caused by the release of oil and chemical dispersants during the DWHOS event. …
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Comparison of Water Quality, Rainbow Trout Production, and Economics in Oxygenated and Aerated Raceways
… economics were compared at the Wytheville State Fish Hatchery (WSFH) for 270 days. Mean dissolved oxygen (DO) concentrations and delta DO were significantly higher (P < 0.001) in the oxygenated raceways (9.5 and 2.75 mg/L, respectively) compared to aerated raceways (7.4 and 0.57 mg/L). Total …
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Modeling the processes affecting larval haddock (Melanogrammus aeglefinus) survival on Georges Bank
The ultimate goal of early life studies of fish over the past century has been to better understand recruitment variability. Recruitment is the single most important natural event controlling year-class strength and biomass in fish populations. As evident in Georges Bank haddock, Melanogrammus …
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The impact of restricted ration and chemical stressors on Rainbow trout (Oncorhynchus mykiss) and American flagfish (Jordanella floridae)
… and chemical stressors and their effects on fish survival, growth, and reproduction. Rainbow trout (Oncorhynchus mykiss) were used to assess the impact of restricted feed on acute toxicity and it was found that prior feeding regime is unlikely to affect short-term toxicity results. These …
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Modeling the processes affecting larval haddock (Melanogrammus aeglefinus) survival on Georges Bank
The ultimate goal of early life studies of fish over the past century has been to better understand recruitment variability. Recruitment is the single most important natural event controlling year-class strength and biomass in fish populations. As evident in Georges Bank haddock, Melanogrammus …
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Biological Impacts and Uses of Black Bass Competitive Fishing Tournaments on Large Lake Systems
Recreational fisheries in North America are valued between $47.3 billion and $56.8 billion. Fisheries managers must make strategic decisions based on sound science and knowledge of population ecology, to effectively conserve populations. Competitive fishing, in the form of tournaments, has become …
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The Effect of Highly Unsaturated Fatty Acids (HUFA) on Lake Trout (Salve linus namaycush) Alevins Using Artemia nauplii Enriched with Commercial Emulsions and Dry Diets
… fatty acids (HUFA) are important nutrients for fish survival, development, and reproduction. Fish oil (PO), rich in HUFA, is the dominant lipid source for first feeds in salmonid aquaculture. To determine if other lipid sources would influence survival, growth, and fatty acid profiles in lake …
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Effect of pawpaw (Carica Papaya) seed meal on growth performance, feed utilization, survival and masculinization of sexualy undifferentiated three spotted Tilapia (Oreochromis Andersonii) fry
… levels on growth performance, feed utilization, survival rate and sex ratio of sexually undifferentiated three spotted tilapia (Oreochromis andersonii) fry. Six treatments (replicated thrice) were designed based on the control (basal diet), 17 α-methyltestosterone (MT) (60 mg) and C. papaya seed …
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Instream flow methodologies: an evaluation of the Tennant method for higher gradient streams in the national forest system lands in the western U.S.
… for determining instream flow requirements for fish, known as the 'Montana method', or more commonly the Tennant method. The method uses a percentage of average annual flow (AAF) to determine fish habitat quality. From 58 cross sections from 11 streams in Montana, Nebraska, and Wyoming, Tennant …
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ALTERNATIVE LIPIDS IN NUTRITION OF MARINE FINFISH
Fish oil sparing and replacement is a major focus in the fields of aquaculture and aquaculture nutrition. Most of the commercial fish oil production is consumed by the aquafeed industry due to its highly digestible energy and elevated content of long-chain polyunsaturated fatty acids (LC-PUFAs; ARA …