Comparative ecology of fish population dynamics in the new production and regenerated production systems

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Ecological basis of the latitudinal differences in population dynamic of clupeid fishes was investigated, knowing that recruitment variability is as large as 2-3 order of magnitude in fish populations inhabiting the subarctic waters in contrast to 2-3 times difference in annual recruitment, levels in populations inhabiting the subtropical waters.・ Spratelloides gracilis inhabiting tropical and subtropical waters in the western Pacific becomes matured in 3-4 months after hatching and has short generation time.・ Etrumeus teres inhabiting the subtropical waters in the East China Sea and southern Japan becomes matures in 6 months and has prolonged spawning season almost year roud.・ Sardinops melanostictus inhabiting temperate-subarctic waters is largely variable in recruitment and changes spawning and early life ecology associated with population size.・ Clupea pallasii was weak in year class strength in 2000 but established a dominant year class in 2001 in Miyako Bay. Temperature and food availability were found to be important factors determining the year class strength.