Some aspects of the reproductive biology of Stolephorid anchovies from Northern Papua New Guinea

Dalzell, P.

Some aspects of the reproductive biology of Stolephorid anchovies from Northern Papua New Guinea

1987

Dalzell, P. (International Center for Living Aquatic Resources Management, Makati, Metro Manila (Philippines))

Batch fecundity, length at first spawning, spawning seasonality and ovarian development of Stolephorus heterobus and S. devisi were determined by examination of preserved ovaries from fish captured during 1976-1981 and 1985. Batch fecundity was estimated from the number of eggs in the most advanced ovarian mode and was related to fish length and weight by an exponential function. Batch fecundity estimates were also made for the two less common anchovies, S. waitei (= bataviensis) and S. punctifer (=buccaneeri and zollingeri). Both S. heterolobus and S. devini appeared capable of spawning throughout the year with peaks in spawning intensity during June and November. Spawning intensity was thought to be regulated by the monsoon seasonality. From data on size versus fish length, it was estimated that S. heterolobus and S. devisi were first capable of spawning at 50 and 41 mm (fork length), respectively.

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