| From October 1965 to April 1966, sardine laying in the Gulf of Lion was studied by the Institute of fisheries laboratory of Sète. Plankton fisheries, at two levels (surface and 5 m), were conducted each month on 26 stations distributed over the whole continental shelf. A total of 236 traits were carried out, at surface level and at depths of 5 m, with Hensen nets, dragged at a speed of about one knot, and using a flow-meter, evaluating the volume of filtered water. Moreover, hydrological results concerning the sardine laying season were used, representing 800 observations on environmental conditions. The collected material represents 50 255 eggs and 7 758 larvae preserved with Baker formalin. Its laboratory study included: egg and larva count as well as... |
