Results 231 to 240 of about 41,970 (253)
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Beverton and Holt Reloaded – Incorporating Variable Growth into a Yield Per Recruit Model
SSRN Electronic Journal, 2013Animals to be fattened must be fed with nearly the maximum feeding rate to achieve maximum yields – food supply and food consumption must coincide. This we know for centuries from agriculture. Yields decline immediately when the food supply is limited. Are there parallels between agriculture and fisheries?
Eckhard Bethke, Gerd Kraus
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Yield-Per-Recruit Estimates for Eastern Tropical Atlantic Yellowfin Tuna
Transactions of the American Fisheries Society, 1972Abstract Estimates of instantaneous total mortality for eastern tropical Atlantic yellowfin tuna range from 1.52 to 2.32. First capture for most probable maximum yield per recruit should occur between ages 1.9 and 3.3. Within this range the values of age at first capture tend to cluster around 2.5 years, or about 100 cm and 22 kg.
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Further Perspectives on Yield per Recruit Analysis and Biological Reference Points
Canadian Journal of Fisheries and Aquatic Sciences, 1991Spawner–recruit relationships (SRRs) are indeterminate for most species. Earlier workers proposed solving "amount of harvest" problems for such cases by tacitly assuming that the SRR is density independent (a straight line through the origin) for the available data.
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Visualizing Trade-Offs between Yield and Spawners per Recruit as an Aid to Decision Making
North American Journal of Fisheries Management, 2016Abstract There is a fundamental conflict between harvesting fish and conserving their biomass. Managers mediate this conflict with regulations that control fishery methods and amounts of harvest. In most recreational fisheries, aside from closed seasons, the precise control of fishing effort is difficult to achieve because fisher entry ...
Patrick J. Schmalz +4 more
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Fisheries Research, 1994
Abstract A simple method to estimate the parameters of the Ricker stock-recruitment model is described. The method is based on the Beverton and Holt yield per recruit model, as a function of fishing mortality, which can be used to describe the stock-recruitment relationship of an exploited stock even when the data are limited to 1 year of estimates ...
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Abstract A simple method to estimate the parameters of the Ricker stock-recruitment model is described. The method is based on the Beverton and Holt yield per recruit model, as a function of fishing mortality, which can be used to describe the stock-recruitment relationship of an exploited stock even when the data are limited to 1 year of estimates ...
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Analysis of Potential Yield per Recruit for Striped Bass Produced in Chesapeake Bay
North American Journal of Fisheries Management, 1984Abstract The yield of striped bass (Morone saxatilis) in biomass and numbers was estimated for constant recruitment of young fish into the population on the basis of vital statistics of the Maryland stock. Separate computations were performed for males, females, and sexes combined.
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North American Journal of Fisheries Management, 1986
Abstract We evaluated the effect on yield per recruit of mortality from catch and release of fish smaller than a legal minimum length. Catch-and-release mortality reduces the potential effectiveness of minimum size limits for increasing yield per recruit by an amount that depends on the fishing mortality coefficient, the minimum size limit, and the ...
James R. Waters, Gene R. Huntsman
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Abstract We evaluated the effect on yield per recruit of mortality from catch and release of fish smaller than a legal minimum length. Catch-and-release mortality reduces the potential effectiveness of minimum size limits for increasing yield per recruit by an amount that depends on the fishing mortality coefficient, the minimum size limit, and the ...
James R. Waters, Gene R. Huntsman
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Size-Structured Yield-per-Recruit Simulation for the Florida Gill-Net Fishery for Spanish Mackerel
Transactions of the American Fisheries Society, 1988Abstract We estimated the effects of gill-net mesh size regulations on the yield per recruit of Spanish mackerel Scomberomorus maculatus in Florida. Yield per recruit was calculated with a simulation model that incorporated seasonal fishing rates by sectors (recreational and commercial) and size-varying availabilities of fish to the gear and retention ...
Nelson M. Ehrhardt, David J. Die
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Estimation of yield per recruit when growth and fishing mortality oscillate seasonally [PDF]
ICLARM Fishbyte, 1991 A general form of the yield equation is presented. This is used to investigate the effects of seasonal growth oscillations on estimation of yield per recruit. The results show that these effects will be strongest in short-lived organisms such as penaeid shrimps.
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