spawners


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spawners

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Fish ladders exact a toll of 5 to 10 percent of returning spawners at each of the main-stem dams, but runs could thrive at that level of mortality.
Many of the spawners in the shallower Mosquito Lagoon move through the canal to the deep water in the river.
The latest spawners are the Ganaraskas, arising from a Lake Ontario tributary of the same name in Canada.
Such extended patterns of spawning, or extended readiness to spawn, are typical of indeterminate spawners with asynchronous oocyte development patterns (Hunter et al.
Two recent articles included aging as a tool to study the ecology of the Argentine short-finned squid in Brazil: Schwarz and Perez (2010) used statoliths readings to study their growth and maturation, and Schroeder and Perez (2010) used recent daily increments (Dis) recorded on the gladius to compare growth among different seasonal spawners.
Mature fish showing a narrow otolith edge zone in their spawning year, different from the wider zones laid down in the previous years, were recorded as first-time spawners.
As the virus is carried by most, if not all, tiger prawn spawners used on farms, some form of intervention in the breeding process would be required to `clean up' progeny.
The 1998 spawning run numbered 1,925 fish and was followed by 2,400 spawners in 1999.
Last year, Hilton and Whiskey had these special regulations only from new Highway 395 downstream, but the DFG extended the special regulations upstream on these creeks for this year to give the spawners in these smaller creeks greater protection.
These results, together with falling shrimp catches in the Gulf between Iran and the Arabian Peninsula, were used to justify a longer closed season aimed at protecting spawners.
Contract notice: Delivery of specialist specialized consumables for the continuation of research work in the academy of sciences in olsztyn irzibz project pneumatic method of obtaining fish roe - application options and the impact on the qualitative and quantitative parameters of gametes and welfare spawners (acronym pneufish).
Two types of spawners overlapped spatially within the survey area: those that exhibited peak spawning during April in the SCB at about 15.