The results obtained by the histological analysis of Mediterranean bluefin tuna ovaries collected over a six-month period (March-August) are reported. Five phases of ovarian cycle were characterised: recrudescence {March-early May); ripening (middle May); pre-spawning (late May-June); spawning (late June early July); and spent (late July-August). The ovaries of five specimens caught during the spawning period in the North Ionian Sea and South Adriatic Sea displayed extensive vitellogenic atresia. In females which find themselves in unfavourable environmental condition during the spawning period, follicular atresia could represent a way to re-absorb highly energetic yolk reserve.
Ovarian cycle of the Mediterranean Bluefin tuna (Thunnus thynnus L.)
CORRIERO, Aldo;DESANTIS, Salvatore;
2003-01-01
Abstract
The results obtained by the histological analysis of Mediterranean bluefin tuna ovaries collected over a six-month period (March-August) are reported. Five phases of ovarian cycle were characterised: recrudescence {March-early May); ripening (middle May); pre-spawning (late May-June); spawning (late June early July); and spent (late July-August). The ovaries of five specimens caught during the spawning period in the North Ionian Sea and South Adriatic Sea displayed extensive vitellogenic atresia. In females which find themselves in unfavourable environmental condition during the spawning period, follicular atresia could represent a way to re-absorb highly energetic yolk reserve.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
