spawners


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spawners

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Fecundity is highly variable over the course of the spawning season, especially in heterochronal spawners, thus studies conducted over multiple years or with greater sample sizes of fish are likely to estimate higher fecundity ranges (9).
Higher rates of survival to repeat-spawning age and a sex ratio closer to 1:1 should lead to accelerated population rebuilding, as opposed to the rebuilding potential of a population with far more males and virgin spawners.
1) means that cohorts are likely 4 y old when they reach the minimum catch size (145 mm) and join the fishery as adult spawners.
All of spawner fish were subsequently kept at out-door circular concrete at a density up to 10 kg/m3.
gouldii were broadcast spawners with open populations, parasite loads must be analyzed by location in Southern California clams.
An annual run of 100 or more chinook spawners would "make a difference in terms of wild fish health," Ziller said.
Agonistic behaviors were similar to behaviors in other territorial cyprinids with different mating strategies like the crevice spawners Cyprinella (Stout, 1975; Phillips and Johnston, 2008; C.
Mr Schofield said existing measures to protect early run salmon contribute an estimated2,500 spring salmon spawners per year to the English and Welsh stock.
Smelt spawn after ice-break at water temperatures above 4 [degrees]C (Hutchinson & Mills, 1987), when shoals of spawners move along with the melting ice-cover towards the littoral spawning grounds.
MUCH has been said and written recently about a suggestion that the salmon fishing season on the Tay be delayed for a fortnight to protect late spawners and kelts.
Since each adult female can carry as many as 10,000 eggs, the potential boost to the population from just a few large spawners can be significant.
If the spawners are more than a meter apart, Hughes notes, fertilization doesn't occur.