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Seasonal variation in reproductive investment in the tropical loliginid squid Loligo chinensis and the small tropical sepioid Idiosepius pygmaeus


Seasonal variation in reproductive investment in the tropical loliginid squid Loligo chinensis and the small tropical sepioid Idiosepius pygmaeus



U S National Marine Fisheries Service Fishery Bulletin 91(2): 260-270



Seasonal variability in gonad growth was investigated for the tropical cephalopods Loligo chinensis and Idiosepius pygmaeus. Statolith ageing techniques enabled a comparison of gonad growth in relation to both individual size and age. Age analyses revealed that male and female individuals of L. chinensis matured earlier during the warmer summer period than in the cooler winter period. These preliminary results suggested that maturity was governed more by individual size rather than age. Analysis of seasonal change in the gonadosomatic index (GSI) revealed that L. chinensis gonad tissue accounted for the greatest percentage of body weight in the month of October. The trend in the nidamental gland/mantle length index closely paralleled the trend in GSI values for female individuals of L. chinensis, while growth of the nidamental gland and hectocotylus closely paralleled growth of the gonad. The seasonal variation in reproductive investment for Idiosepius pygmaeus followed a different pattern compared with L. chinensis. Slower growing cool-season (spring) individuals lived longer and had comparatively larger gonads than their warm-season (autumn) counterparts, despite no difference in body size between the two seasons. Idiosepius pygmaeus thus appeared to be employing a 'trade-off' in its reproductive strategy by partitioning a greater amount of energy into gonad tissue over a longer lifespan during the cooler period of the year.

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