because these populations spawn
synchronously during a restricted period of a few hours in the early night, and sampling time is restricted to just after spawning (Hunter and Goldberg, 1980; Hunter and Macewicz, 1985; Funamoto and Aoki, 2002).
We analyzed 58 successful and 5 unsuccessful spawns
performed by the resident male and several female Nocomis leptocephalus and 10 spawns
disrupted by a male C.
However, over the 2-year period, the maximum egg production from individual spawns
occurred most often at greater illumination phases of the moon.
The immature, developing stage identified females that were immature and unlikely to spawn
but had ovaries containing cortical alveoli stage oocytes (which otherwise identified mature, developing females).
Many species of reef fish aggregate seasonally in large numbers to spawn
at predictable times and sites (Johannes, 1978; Sadovy, 1996; Domeier and Colin, 1997).
Data on timing, location, and magnitude of herring spawning events for the 1998-99 and 1999-2000 spawning seasons were obtained from the herring spawn
survey conducted by the California Department of Fish and Game (CDFG).
Hydration of oocytes began in the morning, and ovulation occurred at sunset of that same day; therefore females with hydrated oocytes were ready to spawn
Whitemouth croaker of the Rio de la Plata estuary spawn
in the region of high salinity gradients.
Hence, although yellowfin sole spawns
eggs intermittently in batches, they undergo a group synchronous mode of oocyte development.
There is no concise data available regarding spawns
but according to a user called Rathbunkum, there might be many variations in the spawning rates.
twice a year, once in March-April and then in October-November.
This species spawns
during the winter or early spring in Alaska.
This study analyzed the quality of recently spawned
eggs and of juveniles over five and six consecutive spawns
, respectively, in a caridean shrimp Neocaridina davidi with direct development.
The Little Manistee produces a fall-run strain that spawns
much earlier, sometimes during winter.
However, the use of high density hapas may reduce the frequency of spawns
and the number of eggs/spawning, suggesting that the density would vary between 2 and 6 fishes [m.