Abstract
The effects of water temperature and light regimes on gonadal development in the sea urchin Paracentrotus lividus were evaluated in two 12-week periods, one in spring–summer and one in winter–spring. Four different combinations of photoperiod and temperature regimes (18–26 °C) were tested in each. Sea urchins were fed a prepared diet. Food intake, growth, gonadosomatic index, biochemical composition and gametogenetic stages were measured. Results show that water temperatures between 18 and 22 °C enhance growth and gonadal development. Long days (illumination) reduce the rates of gametogenesis while short days increase reproductive development.
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