Reproductive cycle of the razor clam Solen marginatus (Pulteney 1799)in Spain. A comparative study in three different places

摘要

The reproductive cycle of the razor clam, Solen marginatus, (Pulteney 1799) is studied in three different places of Spain through time. Sampling was performed in the natural beds of: Eo Estuary (NW Spain) in 1994-95, Santander Bay (N Spain) in 1998-99 and Terron Estuary (SW Spain) in 1999. In Eo, Santander and Terron, respectively: phase 0 (resting stage) occurred in July-August, September-October and August-September, phase I (early gametogenesis) happened in: August-October, October-December and September-November, phase II (late gametogenesis) was developed in November-April, January-May and December-April and phase III (reproduction) took place in: May-June, June-August and May-July. Two new approaches oriented to the fast monitoring of the gametogenic cycle of the species based on sequential mean drained soft parts weights obtained by simulation and on the macroscopic observation of the gonad are presented.