Publication Abstract

Techniques for the Hatchery Conditioning of Bivalve Broodstocks and the Subsequent Effect on Egg Quality and Larval Viability

Techniques for the Hatchery Conditioning of Bivalve Broodstocks and the Subsequent Effect on Egg Quality and Larval Viability

S.D. Utting and P.F. Millican

Studies on the hatchery conditioning of bivalve broodstocks are reviewed. The emphasis is on scallops, oysters and clams, species that are of commercial importance. The technological requirements for broodstock conditioning, including holding systems and sea water treatment, are briefly described. This is followed by a more detailed analysis of the environmental and biological requirements including the effects of temperature, photoperiod and food supplements. Of particular importance is the optimisation of the quantity and quality of microalgae diets that are provided during the period of broodstock conditioning. The effects of conditioning regimes on the fecundity of broodstock, egg quality and larval viability are shown. The number of eggs produced and the polyunsaturated fatty acid (PUFA) composition of the eggs are influenced by the quantity and quality of lipid in microalgae diet supplements. Under optimal hatchery rearing conditions, differences in initial egg lipid reserves may not necessarily affect subsequent larval growth and survival. The importance of lipid and PUFA reserves, in particular eicosapentaenoic acid on 20:5(n - 3), during the development of embryos and larvae can, however, be clearly demonstrated under more stressful rearing conditions. The importance of good hatchery practice is highlighted.

Reference:

S.D. Utting and P.F. Millican, 1997. Techniques for the Hatchery Conditioning of Bivalve Broodstocks and the Subsequent Effect on Egg Quality and Larval Viability. Aquaculture, 155: 45-54

S.D. Utting* and P.F. Millican*

Aquaculture, 155: 45-54