Results 271 to 280 of about 9,423 (285)
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Chlorinated hydrocarbons and hatching success in Baltic herring spring spawners
Marine Environmental Research, 1985Abstract Eggs from 69 females of spring spawning herring from the German Baltic coast (Travemunde, April 1979) were incubated in clean sea water (20‰ S, temperature 8°C) under standard conditions. Sixty-one trials could be used for the evaluation of hatching success.
P.-D Hansen +2 more
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Estimating reference fishing mortality rates from noisy spawnerrecruit data
Canadian Journal of Fisheries and Aquatic Sciences, 2004We review and evaluate methods of estimating reference fishing mortality rates from spawnerrecruit (SR) data to obtain maximum sustainable yield. Using Monte Carlo simulations, we found that a reference fishing mortality rate derived from the maximum likelihood estimates of the SR parameters was less biased than reference fishing mortality rates ...
A Jamie F Gibson, Ransom A Myers
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Fecundity and Spawning Frequency of Captive Tessellated Darters–Fractional Spawners
Transactions of the American Fisheries Society, 1985Abstract In 1982–1983, 15 pairs of captive tessellated darters Etheostoma olmstedi proved to be fractional spawners and produced from two to eight clutches (19 to 324 eggs per clutch; mean = 158) between the last week of April and the first week of August, in northeastern Pennsylvania. Average clutch size for individual pairs ranged from 49 to 204. The
William F. Gale, William G. Deutsch
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Precise Timing of Upstream Migrations by Repeat Steelhead Spawners
Transactions of the American Fisheries Society, 1985Abstract Summer and winter races of steelhead Salmo gairdneri were tagged in the Kalama River, Washington, during spawning migrations of 1976–1982. Some marked fish returned to the tagging site during spawning runs 1–2 years later. Using 2-week sampling strata, the date of subsequent return was significantly related to the prior time of tagging for ...
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Density dependence in total egg production per spawner for marine fish
Fish and Fisheries, 2018AbstractA paradigm of fisheries science holds that spawning stock biomass (SSB) is directly proportional to total egg production (TEP) of fish stocks. This “SSB–TEP proportionality” paradigm has been a basic premise underlying the spawner–recruitment models for fisheries management and numerous studies on recruitment mechanisms of fish.
Akinori Takasuka +2 more
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Implications of protracted recruitment for perception of the spawnerrecruit relationship
Canadian Journal of Fisheries and Aquatic Sciences, 2001In European lobster, Homarus gammarus, wide growth variation means that annual recruitment to a fishery (individuals reaching legal size in the same year) consists of at least six year-classes (individuals hatching in the same year). In this paper, a simple simulation analysis is used to explore the effects of uncertainty about the specifics of this ...
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Sea-Age Variation in Maiden Atlantic Salmon Spawners: Phenotypic Plasticity or Genetic Polymorphism?
Bulletin of Mathematical Biology, 2011Atlantic salmon exhibit a partially heritable polymorphism in which the morphs are distinguished by the duration and location of the sea-phase of their life-cycle. These morphs co-occur, albeit in characteristically different proportions, in most Scottish rivers and in both the spring and autumn spawner runs; early running fish being generally ...
Gurney, William +4 more
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Influence of salmon spawner densities on stream productivity in Southeast Alaska
Canadian Journal of Fisheries and Aquatic Sciences, 1999We conducted this study to determine the relationship between salmon spawner abundance and stream biofilm and benthic macroinvertebrate abundance in Southeast Alaska. Experiments took place in outdoor artificial and natural streams. Six pink salmon (Oncorhynchus gorbuscha) carcass treatments (0.00, 1.45, 2.90, 4.35, 5.80, and 7.25 kg wet mass) placed ...
Mark S. Wipfli +3 more
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Fecundity and Spawning Frequency of Caged Bluntnose Minnows–Fractional Spawners
Transactions of the American Fisheries Society, 1983Abstract Eleven pairs of bluntnose minnows Pimephales notatus produced from 7 to 19 clutches of eggs between May 27 and August 28. Clutches ranged in size from 5 to 547 eggs. Average clutch size ranged from 93 to 239. The total number of eggs spawned per pair ranged from 1,112 to 4,195 (mean = 2,396).
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