The ovaries of heterochronal spawners
develop asynchronous oocyte patterns in which representations of oocytes from most stages of maturity are present (17, 18).
2001) and Murauskas and Rulifson (2011) classified both species as batch spawners
, Maryland hatchery personnel do not mention this aspect in their methodology.
Rehabilitation of this stock may now depend upon transplanting spawners
or releasing hatchery-reared juveniles.
Most adult female Argentine Hake <40 cm TL are 2-3 years old and considered first-time spawners
for the Patagonian stock of this species (Otero et al.
The criteria include the number of spawners
that returned three years previously, the "parent year-class.
Two types of spawners
overlapped spatially within the survey area: those that exhibited peak spawning during April in the SCB at about 15.
Because broadcast spawners
are susceptible to mate limitation (which is the dominant cause of Allee effects in aquatic invertebrates), the reproductive asynchrony we found in Spondylus populations in Ecuador further increases the significance of potential depensatory mechanisms and of nearest neighbor distance.
One part of the study includes a "mark-and-recapture" effort to estimate spawner
Fertilized eggs, larvae, and the parent spawner
muscle were analyzed to detect a nutritional source during the nonfeeding period.
It shouldn't be long before a 30-plus pound spawner
redfish inhales it--or a tarpon.
The silver sea bream is a winter spawner
and was successfully bred at Albion Fisheries Research Centre and has an excellent taste and a high commercial value.
oocytes at early migratory nucleus, late migratory nucleus, and hydrated stages, as well as new postovulatory follicles) of an indeterminate multiple-batch spawner
, Japanese flounder (Paralichthys olivaceus), was evaluated.