Because of the high abundance of spawners
, there were about 10 times more newly-hatched larvae in the unfished area than the fished area (Stoner and Ray, 1996).
Age distribution of male first-time spawners
differed significantly among all three morphotypes (p = 0.
In addition, angling deadlines on certain rivers were moved downriver to reduce pressure on returning spawners
calcifer individuals from Ayangue are distinct batch spawners
During the latter half of August or very early September in 2007 and 2008, prior to the expected season of southerly migration of cownose rays through Core, Back, and Bogue Sounds, we created spawner
sanctuaries for adult scallops and protected them by erecting stockades modified from those used by Peterson et al.
Many different strategies have been used to supplement bivalve populations to enhance fisheries including the release of hatchery seed, transplant of bivalves from closed areas to cleaner waters for depuration, modification of bottom types to improve settlement and post settlement survival, and the use of spawner
transplants to increase larval production (Kassner & Malouf 1982, Peterson et al.
1983), the increases in spawner
and recruit virtual abundances were represented by positive cyclical anomalies, and the decreases were represented by negative cyclical anomalies.
Based on histological sections of ovaries and the oocyte size frequency distribution were able to classify the ovarian development organization of the Brazilian snapper as asynchronous, and the reproductive style as indeterminate fecundity spawner
2012a) used cohort reconstruction methods (Hilborn and Walters, 1992) to estimate broad year exploitation rates, referred to as the spawner
reduction rate and defined as the reduction in a brood's potential adult spawner
escapement that is caused by ocean fisheries in relation to escapement potential in the absence of ocean fishing.
Further studies must be conducted to say with certainty whether or not the Alabama shad is a heterochronal spawner
All of spawner
fish were subsequently kept at out-door circular concrete at a density up to 10 kg/m3.
So when I saw an angler reel in a huge spawner
in the shad zone below the Holyoke Dam last week, I was quite surprised.