The effect of prolonged exposure to elevated temperatures on the biochemical constituents, gonadal development and shell deposition of the American oyster, Crassostrea virginica

1975 ◽  
Vol 51 (2) ◽  
pp. 157-164 ◽  
Author(s):  
G.M. Ruddy ◽  
S.Y. Feng ◽  
G.S. Campbell
Keyword(s):  
Crassostrea Virginica ◽  
Elevated Temperatures ◽  
Prolonged Exposure ◽  
Gonadal Development ◽  
American Oyster ◽  
Biochemical Constituents ◽  
Shell Deposition

scholarly journals Effect of temperature and salinity on the reproductive cycle of males and females of Crassostrea virginica (Bivalvia: Ostreidae).

2016 ◽  
Vol 64 (2) ◽  
pp. 449 ◽  
Author(s):  
Luis Alfonso Ascencio Aguirre ◽  
Martha Enríquez D. ◽  
Imelda Martínez M. ◽  
Dalila Aldana A.
Keyword(s):  
Crassostrea Virginica ◽  
Reproductive Cycle ◽  
Management Strategies ◽  
Gonadal Development ◽  
Effect Of Temperature ◽  
American Oyster ◽  
Additional Information ◽  
Standard Procedures ◽  
Size Groups ◽  
Reproductive Cycles

<p>The American oyster, <em>Crassostrea virginica,</em> is one of the most important economic coastal fishery activities in Mexico. As for other bivalve molluscs, its sustainability is based on healthy populations, and additional information on current reproductive cycles, will reinforce local management strategies. The objective of this study was to evaluate the effect of temperature and salinity on the gonadal development stages in both sexes and in two size groups (40-60 mm and ≥ 61 mm) of <em>C. virginica</em> from Tamiahua Lagoon, Gulf of Mexico. Monthly surveys of 90 organisms were undertaken, for a yearly total of 1 080 oysters sampled from the lagoon in 2011. Both field and laboratory work used standard procedures. Our results showed that reproduction was continuous in both sexes, but some peaks of the reproductive cycle were observed along the year. Peaks registered from January to July were for gametogenesis; those of June and September were for mature individuals; and in January, February, and from September to December, for spawning/spent oysters. Maturity of females of both range sizes was positively correlated with temperature, but not for males. For spawning, spent individuals, males of sizes ≥ 61 mm were positively correlated with salinity, whereas smaller males (40-60 mm) and females of both sizes, did not show any correlation. In this study, we observed that temperature and salinity had a different effect in the reproduction of the American oyster of different sizes and sexes of Tamiahua lagoon.</p>

CYCLIC CHANGES IN THE GONAD OF THE AMERICAN OYSTER, CRASSOSTREA VIRGINICA (GMELIN)

1964 ◽  
Vol 42 (2) ◽  
pp. 305-321 ◽  
Author(s):  
Austina V. Kennedy ◽  
Helen I. Battle
Keyword(s):  
Crassostrea Virginica ◽  
Gonadal Development ◽  
Germinal Epithelium ◽  
Nuclear Area ◽  
Seasonal Growth ◽  
Body Width ◽  
Visceral Mass ◽  
Current Season ◽  
Primary Oocyte ◽  
Cyclic Changes

Cyclic changes in the gonad of Crassostrea virginica (Gmelin), a dioecious, oviparous lamellibranch, are described as they occurred toward the most northerly limit of the range, Malpeque Bay, P.E.I., Canada, during 1961 and 1962. The gonad, composed of right and left gonadal lobes lying immediately beneath the mantle, consists of extensively branched follicles comprising the outer margin of the visceral mass. The follicles open into peripherally located ducts which lead into paired gonoducts terminating in the suprabranchial chamber. During the fall and winter the germinal epithelium is in an indifferent or inactive state. The sex for the current season is distinguishable when proliferation commences in May. Maximum gonadal development occurs in late June or early July as determined by comparison of gonadal width to body width in mid-transverse sections. Primary oocytes are initially distinguishable from oogonia by the presence of a distinct nucleolus, and later by an amphinucleolus consisting of a plasmosome and a karyosome. Seasonal growth of the primary oocyte was followed by a planimetry method using measurements of total area and nuclear area from prepared sections. The spindle for the first meiotic division is established immediately on rupture of the oocyte from the follicular wall. Spermatogenesis and spermiogenesis are completed within the follicle. Following spawning, amoebocytes infiltrate the follicles and interfollicular connective tissue to phagocytize unspawned gametes. By late October the follicles of both male and female consist of a low germinal epithelium and a few unresorbed gametes, and remain inactive until proliferation the following spring.

Some biochemical and physiological aspects of growth and gametogenesis inCrassostrea gigasandOstrea edulisgrown at sustained elevated temperatures

1979 ◽  
Vol 59 (1) ◽  
pp. 95-110 ◽  
Author(s):  
Roger Mann
Keyword(s):  
Crassostrea Gigas ◽  
Elevated Temperatures ◽  
Excretion Rate ◽  
Ammonia Excretion ◽  
Live Weight ◽  
Gonadal Development ◽  
Ostrea Edulis ◽  
Shell Weight ◽  
Histological Assessment ◽  
Ammonia Excretion Rate

Crassostrea gigas (Thunberg) andOstrea edulis L.were grown at sustained temperatures of 12°, 15°, 18° and 21°C for a period of 19 weeks. Regular assays of weight specific ammonia excretion rate were made, following which animals were sacrificed for estimation of dry meat weight, dry shell weight, biochemical composition (percentage carbon, nitrogen, carbohydrate, ash) and gonadal development (histological assessment). Crassostrea gigas grew from an intial live weight of 5·2 g to values of 23·5, 28·2, 34·6 and 38·7 g at 120, 150, 180 and 21 °C respectively.

Regulation of metallothionein genes in the American oyster (Crassostrea virginica): Ontogeny and differential expression in response to different stressors

Gene ◽  
2006 ◽  
Vol 379 ◽  
pp. 156-165 ◽  
Author(s):  
Matthew J. Jenny ◽  
Gregory W. Warr ◽  
Amy H. Ringwood ◽  
David A. Baltzegar ◽  
Robert W. Chapman
Keyword(s):  
Differential Expression ◽  
Crassostrea Virginica ◽  
American Oyster
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