Relationship between larval and spat growth rates in the oyster (Crassostrea virginica)

Losee, Ellen

doi:10.1016/0044-8486(79)90142-x

Cited by 22 publications

(9 citation statements)

References 1 publication

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“…These results support the general assumption of commercial hatchery operators that the final grading of a hatchery batch of diploid spat is slower growing, and therefore, of lower value than the top gradings. Similarly, Losee (1979) found that hatchery reared C. virginica which reached metamorphosis earlier than sibling larvae achieved greater subsequent growth rates. In general, Sydney rock oysters take around 3 years to reach market size ( Nell 1993).…”

Section: Discussionmentioning

confidence: 90%

“…Similarly, Newkirk (1981) and Newkirk & Haley (1982) found that there was little relationship between the size of juvenile European oysters, Ostrea edulis L., and subsequent growth rates to market size. In contrast, Losee (1979) found that Crassostrea virginica Gmelin larvae which reached metamorphosis earlier (i.e. faster‐growing larvae) developed into faster‐growing spat.…”

Section: Introductionmentioning

confidence: 94%

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Studies on triploid oysters in Australia: effect of initial size on growth of diploid and triploid Sydney rock oysters, Saccostrea commercialis (Iredale & Roughley)

Hand¹,

Nell²,

Reid³

et al. 1999

Aquaculture Research

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In a 2‐year grow‐out trial, triploid Sydney rock oysters, Saccostrea commercialis (Iredale & Roughley), from two initial size grades grew faster (in terms of both mean whole weight and shell height) than the equivalent initial size grades of sibling diploids (P < 0.05). Small size grade triploids caught up with and had significantly heavier (P < 0.05) final whole weights than large size grade diploids after a 2‐years grow‐out period. The initial size grade had a significant effect on final mean whole weight and shell height for both ploidy types. After the 2‐years grow‐out trial, the final mean whole weights (but not shell heights) of small and large diploids (35.8 ± 0.6 g and 39.4 ± 0.5 g, respectively) were significantly different (P < 0.05). Small and large triploids grew at a similar rate for the first 18 months despite the significantly (P < 0.05) heavier final mean weight of large grade triploids (48.4 ± 0.8 g and 61.2 ± 0.7 g, respectively). The effect of the initial size grade on subsequent growth of both diploid and triploid oysters which was demonstrated in the present study is of significant commercial value to hatchery and nursery operators as well as growers of single seed oysters. In addition, small‐grade triploids appeared to be more valuable in terms of potential growth rate than all diploid grades. There was no significant difference in the final percentage triploidy between small and large grade triploids. A large proportion of diploid/triploid mosaicism was detected in adult oysters.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 94%

Studies on triploid oysters in Australia: effect of initial size on growth of diploid and triploid Sydney rock oysters, Saccostrea commercialis (Iredale & Roughley)

Hand¹,

Nell²,

Reid³

et al. 1999

Aquaculture Research

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show abstract

“…than inside the mantle cavity of the oyster. Losee (1979) and Newkirk & Haley (1982b) reported a negative correlation between the length of the larval period and the size of the individuals in the first growing season but later the correlation was close to zero.…”

Section: Discussionmentioning

confidence: 99%

Divergent selection for growth rate in the European oyster Ostrea edulis response to selection and estimation of genetic parameters

Toro¹,

Newkirk²

1990

Mar. Ecol. Prog. Ser.

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Individual (mass) selection for growth rate was carried out in the European oyster Ostrea edulis (Linne). Oysters from 40 families produced In 1983 were selected on the basis of their live weight after the first growing season. Divergent select~on was applied; the High and Low selected group were mated in pairs according to their rank. Twenty-four families were obtained: 6 Low selected and 18 High selected. A total of 6560 spat were individually tagged and brought to the field for 2 yr. Shell height and live weight after the first and second growing seasons were analyzed. Statistically significant &ffer-ences ( p < 0.05) were found between the offspring of the High and Low selected groups for both traits after both growing seasons. No differences in survival were detected between the fam.ilies of the 2 selected groups. Heritability esbmates for live weight and shell height, after each growing season ranged from h* = 0.112 to 0.243. Genetlc correlations between the traits were found to be high; r, = 0.963 for the first growing season and r, = 0.995 for the second growing season.

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“…Newkirk, Haley, Waugh & Doyle (1977) report evidence which indicates that the growth rates of larvae and spat (9 months old) of C. virginica are positively correlated. Losee (1979), also working with C. virginica , reported that larvae setting earliest produce faster-growing spat (7-month-old juveniles). Also Haley & Newkirk (1978) reported high correlations between live oyster weight (C. virginica) at different ages (2-5-year-old oysters).…”

Section: Discussionmentioning

confidence: 99%

Phenotypic analysis in the Chilean oyster, Ostrea chilensis Philippi 1845: relationship between juvenile and adult growth rates

Toro

Newkirk

1990

Aquaculture Res

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Abstract. The Chilean oyster, Ostrea chilensis Philippi, shows high phenotypic variability for growth rate within populations. In order to determine if the serial correlation of growth rate in oysters is positive, the correlation between shell height and live weight at different stages of the life cycle in a cohort of the Chilean oyster was estimated. Four size groups of individually tagged oysters selected on the basis of their shell heights were examined. The relationships for juvenile and adult oysters were found to be positively correlated throughout the study period. The correlation coefficients ranged from r = 0.28 to r = 0.83. For shell height the coefficient of determination for market size oysters was higher in 2‐year‐old (r2=0.88) than in 1‐year‐old oysters (r2=0.09). Shell height and live weight were more highly correlated at later stages of the life cycle. The results indicate that 2‐year‐old oysters have a size that is indicative of performance to market size and hence is an appropriate age to select the parents to be used in breeding programmes to improve the growth rate in O. chilensis. A high mortality was detected after the natural spawning period. A physiological stress hypothesis is proposed to explain the high summer mortality in O. chilensis in the Quempillen estuary, southern Chile.

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Relationship between larval and spat growth rates in the oyster (Crassostrea virginica)

Cited by 22 publications

References 1 publication

Studies on triploid oysters in Australia: effect of initial size on growth of diploid and triploid Sydney rock oysters, Saccostrea commercialis (Iredale & Roughley)

Studies on triploid oysters in Australia: effect of initial size on growth of diploid and triploid Sydney rock oysters, Saccostrea commercialis (Iredale & Roughley)

Divergent selection for growth rate in the European oyster Ostrea edulis response to selection and estimation of genetic parameters

Phenotypic analysis in the Chilean oyster, Ostrea chilensis Philippi 1845: relationship between juvenile and adult growth rates

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