O 38
LUC DE FRANSSU
Oysters.
1988 3 pp
Infofish International 3/88, 14–16.
Of the four major producers of oysters, the Republic of Korea was the only one to register increased production over the past decade. Overall, pollution problems are likely to further restrict future production.
O 40
SPENCER, B.E.
Growth and filtration of juvenile oysters in
experimental outdoor pumped upwelling systems.
1988 19 pp
Aquaculture, 75, 139–158
Hatchery-reared Ostrea edulis and Crassostrea gigas seed grown in outdoor pumped upwelling systems show enhanced growth in water fertilized with N, P, and Si or N and P only compared to that in unfertilized water. The effect of water flow rate on growth depends on the amount of food in the water. Observations on filtration suggest that maximum feeding occurs at flow rates which produce about 20% filtration of suspended material passing through an upwelling column. Equations are derived which describe the relationship between filtration, flow rate, temperature, food concentration and oyster size. These offer an explanation for the variability of growth due to flow rate and food concentration and provide a means of managing flow to give maximum feeding and therefore maximum growth.
O 41
THIRIOT-QUIEVREUX, C., NOEL, T., BOUGRIER, S. and S.
DALLOT
Relationships between aneuploidy and growth rate in
pair matings of the oyster Crassostrea gigas.
1988 7 pp
Aquaculture, 75, 89–96
The incidence of aneuploidy was studied in different sizeclass full-sib juveniles of two pair matings in Crassostrea gigas. In all cases, slow-growing juveniles showed the highest percentage of aneuploid cells. the relationship between aneuploidy and growth rate is discussed in the light of previous genetic studies on heterozygosity-growth rate correlation and heterozygosityviability correlation.
O 42
DAVIES, I.M., DRINKWATER, J. and J.C. MCKIE
Effects of tributyltin compounds from antifoulants on
Pacific oysters (Crassostrea gigas) in Scottish Sea
Lochs.
1988 11 pp
Aquaculture, 74, 319–330
Before 1987, tributyltin-based antifoulants were used in Scottish sea lochs on both the hulls of vessels and on cage nets at marine salmon farms. In two sea lochs, the leachates from these antifoulants caused accumulation of tin compounds in soft tissue, and had deleterious effects on the shell structure, growth and condition of Pacific oysters (Crassostrea gigas). The extent and intensity of the effect appeared to be dependent upon source size and distribution, and upon hydrographic factors. The use of triorganotin compounds in antifoulants for mariculture applications, and on vessels less than 25 m, has now been prohibited in the U.K.
