Annual and batch fecundities of yellowfin sole, Limanda aspera, in the eastern Bering Sea

Issue:

Author(s): 
Nichol, Daniel G. , and Erika I. Acuna
Cover date: 
2001
PDF: 
Pages: 
108-122
Abstract: 

Annual and batch fecundities of yellowfin sole, Limanda aspera, in the eastern Bering Sea were determined. Most individuals had a determinate, group-synchronous mode of oocyte development as evidenced by a distinctly separate distribution of fully yolked oocytes in more advanced ovaries. The spawning of batches by an individual female occurs in uninterrupted succession, as indicated by the presence of oocytes with migratory-stage nuclei in nearly all females undergoing oocyte hydration. Total fecundity ranged from 295,615 to 3,635,108 oocytes per female and is described by 3.3225 × TL 3.6312, where T = total fish length (cm). The length-fecundity relationship was found to be the same in both southeast and northwest areas of the eastern Bering Sea, despite known growth differences between the two areas. Individual females spawn from 8 to 11 batches. The first batch spawned is generally smaller in number than succeeding batches. After spawning begins, fish remain in the nearshore spawning area (<30 m bottom depth) until spent. The presence of residual chorion tissue from unspawned ova in the ovary lumen of some maturing females indicates that at least some females are capable of spawning more than one series of batches within one reproductive season. The annual fecundity, therefore, for such individuals is consequently considered indeterminate.