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.
Bibliographical noteFunding Information:
This research was funded by the Texas–Israeli Exchange Fund, grant no. 845-4782, and by the Israeli Ministry of Agriculture, grant no. 894-0125-02. Thanks to Barbara Colorni for the histology work; Prof. John Lawrence, Prof. John Lee, and Dr. Angelo Colorni for the helpful comments; and to Mikhal Ben-Shaprut for the help in editing. This paper is funded in part by a grant from the National Sea Grant College Program, National Oceanographic and Atmospheric Administration, U.S. Department of Commerce, under Grant NOAA NA06RG0142, project number A/EA-1 through the California Sea Grant College System to SM. The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies.
- Biochemical composition
- Sea urchins
ASJC Scopus subject areas
- Aquatic Science