A 4-wk rearing trial of the sea urchin Paracentrotus lividus was carried out in a closed-circuit system in the presence and absence of food supply to evaluate the short-term response of gametogenesis to different feeding conditions. At the end of the trial, the gonad index (GI) was calculated, histological analyses of the gonads were performed, gamete fertilization ability was evaluated, and sperm motility was assessed by computerized motility analysis. Starvation significantly affected gametogenesis, whereas developing gametes were always observed in fed animals, whose GI had doubled by the end of the 4-wk trial. No differences were recorded between gametes from reared (fed) urchins and wild-collected ones. Although spent gonads frequently contained unspawned motile spermatozoa or morphologically intact eggs, the fertilization ability of gametes from starved urchins was significantly lower. It may be concluded that, although they were at the end of the reproductive season, the specimens fed ad libitum were able to reactivate the gamete maturation process immediately. This ability can be used in short-term procedures for roe enhancement and gamete production, particularly for specimens from areas in which environmental conditions determine slow gametogenesis and a consequently short reproductive season.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 29 • No. 4