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Marine Ecology Progress Series

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MEPS 218:167-177 (2001)  -  doi:10.3354/meps218167

Temporal variation in growth rates and reproductive parameters in the small near-shore tropical squid Loliolus noctiluca; is cooler better?

George D. Jackson1,*, Natalie A. Moltschaniwskyj2

1Institute of Antarctic and Southern Ocean Studies, University of Tasmania, PO Box 252-77, Hobart, Tasmania 7001, Australia
2School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Locked Bag 1-370, Launceston, Tasmania, 7250, Australia

ABSTRACT: Seasonal growth rates and size- and age-at-maturity were analysed for the small near-shore tropical loliginid squid Loliolus noctiluca off North Queensland, Australia, over a 2 yr. Age of individuals was determined using daily statolith increments. The life cycle of L. noctiluca off North Queensland was just over 4 mo. Analysis of growth found that growth was non-asymptotic, and the form of the curve; exponential, linear or log-linear, depended on sex and season that individuals were caught. Winter-caught individuals were the fastest growing and achieved the largest size compared with summer or autumn-caught individuals. Furthermore, females grew faster than males during the winter. The patterns of growth of L. noctiluca were compared between tropical North Queensland and temperate New South Wales. The temperate individuals lived longer and had slower growth rates. There was also a marked seasonal influence on the onset of sexual maturity among the North Queensland population, with the fastest growing winter-caught individuals maturing later than the autumn or summer individuals. L. noctiluca has a large latitudinal range from New Guinea to Tasmania, this study, and published work, suggests a trend towards increased lifespan and decreased growth rate with increasing latitude.

KEY WORDS: Statoliths · Age · Growth rates · Squid · Reproduction

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