The early development of Paracentrotus lividus was examined in natural sea water and in two artificial media (a commercial sea water and one prepared in the laboratory). The observations were carried out up to 40 hours (at 25°C) after fertilization when the embryos were at the echinopluteus stage. The developmental rate in the tested waters did not significantly differ but the mean size of the echinopluteus did; it was usually greater in laboratory water. These results indicate that up to the echinopluteus stage embryonic development is completely "endotrophic", since it does not necessarily require the several biologically active substances present in natural sea water. The use of a laboratory standard water may be recommended for short-time bioassays using P. lividus as test-organism.
Early development of sea urchin eggs (Paracentrotus lividus Lmk.) in artificial media.
MARIN, MARIA;BRESSAN, MONICA;
1987
Abstract
The early development of Paracentrotus lividus was examined in natural sea water and in two artificial media (a commercial sea water and one prepared in the laboratory). The observations were carried out up to 40 hours (at 25°C) after fertilization when the embryos were at the echinopluteus stage. The developmental rate in the tested waters did not significantly differ but the mean size of the echinopluteus did; it was usually greater in laboratory water. These results indicate that up to the echinopluteus stage embryonic development is completely "endotrophic", since it does not necessarily require the several biologically active substances present in natural sea water. The use of a laboratory standard water may be recommended for short-time bioassays using P. lividus as test-organism.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
