The Relationship between Trends in a Condition Index of the American Oyster, Crassostrea virginica, and Environmental Parameters in Three Virginia Estuaries

Austin, Herbert M.; Haven, Dexter S.; Moustafa, Mary Sue

doi:10.2307/1352508

Cited by 35 publications

(18 citation statements)

References 18 publications

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“…According to Okumus et al (1998), fluctuations in the CI and MY have important implications for cultivation and harvesting strategy. Meat quality and biochemical composition in bivalves primarily depends on food, environmental parameters (mainly temperature) (Brown and Hartwick 1988, Austin et al 1993, Fabioux et al 2005 and reproductive activities (Chávez-Villalba et al 2007). In this study, MY and CI ranged from 2.69% to 12.29% and from 5.21% to 20.42%, respectively.…”

Section: Discussionmentioning

confidence: 64%

Seasonal variation in reproductive activity and biochemical composition of flat oyster (<em>Ostrea edulis</em>) in the Homa Lagoon, Izmir Bay, Turkey

et al. 2015

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Summary:The reproductive cycle of the flat oyster, Ostrea edulis Linnaeus, 1758, in Homa Lagoon, Izmir Bay, Turkey was examined from August 2008 to July 2009. Gonad samples were analysed histologically in order to determine the sex ratio and gonad development stage. Overall, the sex ratio was recorded as 2.2% female, 42.6% male, 37% hermaphrodite and 17.9% inactive. Glycogen content showed considerable variations between August and February, but decreased gradually thereafter. However, glycogen did not directly affect the reproductive cycle. Total lipid content was positively correlated with temperature and inversely correlated with salinity. In addition, this parameter was influenced by the reproductive activity, which is correlated with the fluctuation of the condition index and gonad index (P<0.05). However, the relationship between the protein index and the gonad index was negative (P<0.05). The results of this study showed that protein was the major energy resource. The condition index varied between 2.69±0.91 (February) and 12.29±1.45 (April) during the year. With respect to meat yield, oyster quality changed from "fine" to "special", except in December and February.Keywords: flat oyster; Ostrea edulis; reproductive cycle; biochemical composition; Aegean Sea; Homa Lagoon.Variación estacional de la actividad reproductiva y de la composición bioquímica de ostra plana (Ostrea edulis) en Homa Lagoon, bahía de Izmir, Turquía Resumen: El ciclo reproductivo de la ostra plana, Ostrea edulis Linnaeus, 1758, en Homa Lagoon, Bahía de Izmir, Turquía, fue examinado entre agosto de 2008 y julio de 2009. Las gónadas se analizaron histológicamente para determinar la proporción de sexos y su estado de desarrollo. La proporción de sexos encontrada fue 2.2% hembras, 42.6% machos, 37% hermafroditas y 17.9% inactivos. El contenido de glucógeno mostró considerables variaciones entre agosto y febrero, pero después de estos meses se produjo un aumento gradual. Sin embargo el glucógeno no afectó directamente el ciclo reproductivo. El contenido total de lípidos se correlacionó positivamente con la temperatura e inversamente con la salinidad. Además, este parámetro estuvo influenciado por la actividad reproductiva, que se correlaciona con la fluctuación del índice de condición y del índice gonadal (P<0,05). Sin embargo la relación entre el índice de proteí-na y el índice gonadal fue negativa (P<0,05). Los resultados de este estudio mostraron que la proteína era la principal fuente de energía. El índice de condición varió entre 2.69±0.91 (febrero) y 12.29±1.45 (abril) durante el año. En lo que respecta a la producción de carne, la calidad de las ostras pasó de "fine" to "special", excepto en diciembre y febrero.

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Section: Discussionmentioning

confidence: 64%

Seasonal variation in reproductive activity and biochemical composition of flat oyster (<em>Ostrea edulis</em>) in the Homa Lagoon, Izmir Bay, Turkey

et al. 2015

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“…CI and MY of bivalve species are affected by endogenous origin such as gametogenic cycle of animals and exogenous origin such as water temperature (Austin et al, 1993), salinity, pH, oxygen level and food availability (Orban et al, 2002;Flores-Vergara et al, 2004). However, salinity, pH and dissolved oxygen level did not significantly effect the CI, MY and biochemical composition of oyster in the Dardanelles.…”

Section: Resultsmentioning

confidence: 99%

Seasonal variation in the condition index, meat yield and biochemical composition of the flat oysterOstrea edulis(Linnaeus, 1758) from the Dardanelles, Turkey

Yıldız

Berber

Acarlı

et al. 2011

Italian Journal of Animal Science

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This study was conducted in Dardanelles between October 2007 and August 2009 when condition index, meat yield, biochemical compositions and environmental parameters of seawater were investigated and the study area was found to have available conditions for cultivation. Investigation of the study area showed a positive correlation in particular among condition index, seasonal variation of temperature, protein, fat and chlorophyll-a; a negative correlation was seen between them and carbohydrate value. It was clear from the two years study that the most ideal period for oyster harvest is April and August especially when condition index was maximum followed by a winter with no oyster yield is available in terms of the related processes involving oyster cultivation.

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“…No previously published estimates were available for the intervening years 1985^1991. In order to estimate smolt abundance in these years, we ¢rst calculated a ratio of the number of redds (nests) observed in the Snake River Basin (as reported by Beamesderfer et al (1997)) to the number of smolts estimated by Raymond (1988) for the out-migration years 1975^1984. We then applied this ratio to the number of redds observed in 19831 989 in order to estimate the number of smolts arising from these nests in 1985^1991.…”

Section: (A) Datamentioning

confidence: 99%

“…Because we knew the age composition of ¢sh that returned to spawn (Beamesderfer et al 1997), it was possible to estimate the number of returning adults from each out-migration of smolts. Data from the spawning ground were not yet available for 1999 and 2000.…”

Section: (A) Datamentioning

confidence: 99%

The road to extinction is paved with good intentions: negative association of fish hatcheries with threatened salmon

Levin

Zabel

Williams

2001

Proc. R. Soc. Lond. B

166

139

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Hatchery programmes for supplementing depleted populations of ¢sh are undergoing a worldwide expansion and have provoked concern about their rami¢cations for populations of wild ¢sh. In particular, Paci¢c salmon are arti¢cially propagated in enormous numbers in order to compensate for numerous human insults to their populations, yet the ecological impacts of this massive hatchery e¡ort are poorly understood. Here we test the hypothesis that massive numbers of hatchery-raised chinook salmon reduce the marine survival of wild Snake River spring chinook, a threatened species in the USA. Based on a unique 25-year time-series, we demonstrated a strong, negative relationship between the survival of chinook salmon and the number of hatchery ¢sh released, particularly during years of poor ocean conditions. Our results suggest that hatchery programmes that produce increasingly higher numbers of ¢sh may hinder the recovery of depleted wild populations.

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The Relationship between Trends in a Condition Index of the American Oyster, Crassostrea virginica, and Environmental Parameters in Three Virginia Estuaries

Cited by 35 publications

References 18 publications

Seasonal variation in reproductive activity and biochemical composition of flat oyster (<em>Ostrea edulis</em>) in the Homa Lagoon, Izmir Bay, Turkey

Seasonal variation in reproductive activity and biochemical composition of flat oyster (<em>Ostrea edulis</em>) in the Homa Lagoon, Izmir Bay, Turkey

Seasonal variation in the condition index, meat yield and biochemical composition of the flat oysterOstrea edulis(Linnaeus, 1758) from the Dardanelles, Turkey

The road to extinction is paved with good intentions: negative association of fish hatcheries with threatened salmon

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