Results 221 to 230 of about 44,314 (257)
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North American Journal of Fisheries Management, 2013
Abstract Equilibrium yield models predict the total biomass removed from an exploited stock; however, traditional yield models must be modified to simulate roe yields because a linear relationship between age (or length) and mature ovary weight does not typically exist. We extended the traditional Beverton–Holt equilibrium yield model to
Michael E. Colvin +2 more
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Abstract Equilibrium yield models predict the total biomass removed from an exploited stock; however, traditional yield models must be modified to simulate roe yields because a linear relationship between age (or length) and mature ovary weight does not typically exist. We extended the traditional Beverton–Holt equilibrium yield model to
Michael E. Colvin +2 more
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Yield-per-recruit modeling of two piscivores in a Midwestern reservoir: A Bayesian approach
Fisheries Research, 2017Abstract Walleye Sander vitreus and hybrid striped bass Morone chrysops x M. saxatilis fisheries are supported by annual stockings in many US midwestern reservoirs. To maximize return to the angler, yield-per-recruit models are often used to evaluate expected yield and assist managers to determine which regulation to implement, generally length ...
Jason C. Doll +2 more
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Yield per Recruit and Management Recommendations for Alaska Plaice in the Eastern Bering Sea
North American Journal of Fisheries Management, 1990Abstract Adult Alaska plaice Pleuronectes quadrituberculatus are abundant over the continental shelf (40–110-m depths) during the summer, move to the outer shelf during the winter, and return to the shelf in spring. Female Alaska plaice mature at a total length of about 31 cm (6–7 years), and peak spawning occurs during April.
Chang Ik Zhang, Donald R. Gunderson
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Mixed-Species Yield-per-Recruitment Analyses Accounting for Technological Interactions
Canadian Journal of Fisheries and Aquatic Sciences, 1984Multipecies fishery assessment models may be divided into two general categories: those involving analyses of the trophic interdependence of species (biological interactions) and those addressing the question of co-occurrence in fishing gear (technological interactions). Certainly, both categories of interactions may occur simultaneously. Nevertheless,
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Updated Yield-per-Recruit Information on the Tortugas Pink Shrimp Fishery
North American Journal of Fisheries Management, 1986Abstract Portions of a 1979 analysis dealing with optimum-size considerations in the Tortugas, Florida, pink shrimp (Penaeus duorarum) fishery are updated. The 1979 management advice remains essentially the same. The current target minimum size of 103 mm total length theoretically should produce a 14-20% gain, compared to unregulated conditions, in ...
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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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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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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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Age, growth, mortality, and yield-per-recruit for nagroor, Pomadasys kakaan, in Kuwait’s waters
Fisheries Research, 2002Abstract The age, growth and mortality of nagroor, Pomadasys kakaan , were determined from sectioned otoliths of fish from Kuwait waters. Estimated parameters of the von Bertalanffy growth function for pooled data were L ∞ =62.16 cm, K =0.27 per year, and t 0 =−0.47 year ( n =1183).
M Al-Husaini +5 more
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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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