Open AccessContinuous Spat Production of Fiat Oyster: Ostrea Edulis in Running Water 1
Author(s) -
Flassch J. P.,
L'Herroux M.,
Laubier L.
Publication year - 1975
Publication title -
proceedings of the annual meeting ‐ world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0164-0399
DOI - 10.1111/j.1749-7345.1975.tb00017.x
Subject(s) - stocking , ostrea edulis , oyster , biology , tetraselmis suecica , larva , broodstock , fishery , zoology , aquaculture , ecology , algae , fish <actinopterygii>
The breeding of bivalve larvae has up to now always been conducted in closed systems. This method requires great care and consequently much labor. Using running water systems, we intended to exclude handling and avoid infestations and diseases without the use of antibiotics. Primarily, we used two cylindrical 20 m 3 tanks, both with a filtering sand bottom and air‐lift system. The flow was about 400 liters/hr. The temperature was 20 C. One tank was used as the filter, the second as our breeding unit in which circulation was maintained by adapted aeration. Newly released larvae of Ostrea edulis were introduced at four times. Larvae were fed daily at a rate of from 10 Isochrysis galbana, 10 Monochrysis lutheri and 2 Tetraselmis suecica per microliter to 25 I.g., 25 M. 1. and 5 T. s. per microliter. The best results were obtained at the end of experiment using a stocking density of 220 larvae/liter. We observed a shorter larval period than usual records. Metamorphosis took place from day 9 to day 11. Five percent of the larvae were collected as spat on plates at an early stage (24 to 48 the hours), without considering the high number of spat settled on the tank itself. Total number of settled spat was about 15 to 20% of last larval density. These preliminary results need to be studied thoroughly. Nevertheless, the experiment shows that continuous oyster spat production is feasible in running water systems.