Spawning and Egg Production of Oysters and Clams

Davis, Harry; Chanley, Paul

doi:10.2307/1538972

Cited by 42 publications

(24 citation statements)

References 6 publications

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“…Davis and Chanley ( 1956) found that there was no significant difference in the average number of eggs released in a spawning season, whether clams were spawned at 3-, 7-, or 14-day intervals, nor was there any significant difference in the average number of spawnings per female.…”

Section: Methodsmentioning

confidence: 74%

“…In Table 3 the clams have been ranked in order of egg production and are compared with figures presented by Davis and Chanley ( 1956). The total number of eggs produced and the number of eggs released at each spawning were significantly lower in the first experiment than the values found by Davis and Chanley.…”

Section: Resultsmentioning

confidence: 90%

“…The Relationship between total number ( x 106) of eggs produced, and the volume (ml) of the shell cavity, This study: A = 1st experiment; n = 2nd experiment. Davis and Chanley ( 1956) : 0 = 3-day intervals; 0 = 7-day intervals; x = 14-day intervals.…”

Section: Resultsmentioning

confidence: 99%

“…The procedure adopted was similar to that used by Davis and Chanley ( 1956)) although the exact procedure could not be followed.…”

Section: Methodsmentioning

confidence: 99%

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EGG PRODUCTION OF MERCENARIA MERCENARIA

Ansell

1967

Limnology & Oceanography

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Section: Methodsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

“…The procedure adopted was similar to that used by Davis and Chanley ( 1956)) although the exact procedure could not be followed.…”

Section: Methodsmentioning

confidence: 99%

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EGG PRODUCTION OF MERCENARIA MERCENARIA

Ansell

1967

Limnology & Oceanography

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“…This species also has a longer pelagic stage (3-8 weeks) and lower fecundity (250,000-300,000/single brood ;Hopkins 1936;Baker 1995;Brown et al 2004) than C. virginica. The Eastern oyster is oviparous, with females releasing 23-86 million eggs in a single spawn (Davis and Chanley 1956), and the duration between fertilization and settlement is only about 2 weeks (Langdon and Newell 1996). Differences in level Fig.…”

Section: Resultsmentioning

confidence: 99%

Differences in heat shock protein 70 expression during larval and early spat development in the Eastern oyster, Crassostrea virginica (Gmelin, 1791)

Ueda

Boettcher

2009

Cell Stress and Chaperones

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For a variety of species, changes in the expression of heat shock proteins (HSP) have been linked to key developmental changes, i.e., gametogenesis, embryogenesis, and metamorphosis. Many marine invertebrates are known to have a biphasic life cycle where pelagic larvae go through settlement and metamorphosis as they transition to the benthic life stage. A series of experiments were run to examine the expression of heat shock protein 70 (HSP 70) during larval and early spat (initial benthic phase) development in the Eastern oyster, Crassostrea virginica. In addition, the impact of thermal stress on HSP 70 expression during these early stages was studied. C. virginica larvae and spat expressed three HSP 70 isoforms, two constitutive, HSC 77 and HSC 72, and one inducible, HSP 69. We found differences in the expression of both the constitutive and inducible forms of HSP 70 among larval and early juvenile stages and in response to thermal stress. Low expression of HSP 69 during early larval and spat development may be associated with the susceptibility of these stages to environmental stress. Although developmental regulation of HSP 70 expression has been widely recognized, changes in its expression during settlement and metamorphosis of marine invertebrates are still unknown. The results of the current study demonstrated a reduction of HSP 70 expression during settlement and metamorphosis in the Eastern oyster, C. virginica. Keywords

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A modelling study of the role of marine protected areas in metapopulation genetic connectivity in Delaware Bay oysters

Munroe

Klinck

Hofmann

et al. 2013

Aquatic Conservation

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Management decisions concerning location and extent of marine protected areas (MPAs) both for exploited and unexploited resources rely on understanding how populations are interconnected.The potential effects of MPA location and external fishing pressure on genetic connectivity of eastern oyster (Crassostrea virginica) populations in Delaware Bay were examined.An individual‐based metapopulation model that includes post‐settlement population dynamics, larval dispersal, and genetic structure was used to simulate four oyster populations for two periods (1970s and 2000s) with distinct population and environmental conditions. Sensitivity analysis examined the influence of larval dispersal, and simulations included combinations of MPA location (which population was protected) and three fishing mortality rates for non‐MPA populations: low (4%), medium (8%) and high (30%); no fishing was allowed in the MPAs.Results showed (i) salinity‐driven changes in larval dispersal led to relatively small, population‐specific connectivity changes, (ii) MPAs can enhance the frequency of genotypes originating within protected populations in unprotected populations when fishing rates are high (30%), and (iii) demographic shifts can impose temporal variability on the influence of MPAs on connectivity.These results suggest that genetic consequences of siting MPAs must be considered in terms of present population and environmental conditions, as well as allowing for changes in population and genetic connectivity that may shift fundamentally over time.Simulation results indicate that siting protected areas for oyster restoration in low salinity (<12ppt) regions may interact with development of disease resistance in the metapopulation by altering genotype transfer from protected to unprotected downestuary populations. Copyright © 2013 John Wiley & Sons, Ltd.

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Spawning and Egg Production of Oysters and Clams

Cited by 42 publications

References 6 publications

EGG PRODUCTION OF MERCENARIA MERCENARIA

EGG PRODUCTION OF MERCENARIA MERCENARIA

Differences in heat shock protein 70 expression during larval and early spat development in the Eastern oyster, Crassostrea virginica (Gmelin, 1791)

A modelling study of the role of marine protected areas in metapopulation genetic connectivity in Delaware Bay oysters

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