Effects of salinity and rainfall on the reproductive biology of the mangrove oyster (Crassostrea gasar): Implications for the collection of broodstock oysters

Paixão, Leonardo Fernandes da; Ferreira, María Auxiliadora Pantoja; Nunes, Zélia Maria Pimentel; Fonseca-Sizo, Fabrícia; Rocha, Rossineide Martins da

doi:10.1016/j.aquaculture.2012.11.019

Cited by 40 publications

(37 citation statements)

References 15 publications

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“…It was also observed through the principal component analyses (PCA) that the values of density recruited at this location were more related to the dry period, indicating a direct correlation, mainly with salinity, apparently as a regulatory factor for the higher settlement of oysters in the collectors of this location (Figure 4). PAIXÃO et al (2013) suggested that the increased salinity during the dry period was a fundamental factor in the release of the gametes of C. gasar and, consequently, of greater settlement, corroborating the results of this study.…”

Section: Discussionsupporting

confidence: 90%

Recruitment of oyster in artificial collectors on the Amazon macrotidal mangrove coast

Funo¹,

Antônio

Marinho

et al. 2019

Cienc. Rural

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The purpose of this study was to determine the moment of the year for the oyster recruitment and define the type of collector and environmental conditions that maximize recruitment. Collections were conducted, during 12 months, on Amazon Macrotidal Mangrove at two different sites: raft (point I) and mangrove (point II). In each location three types of collectors were used (1) transparent PET bottles, (2) green PET bottles, and (3) PVC sheets, each with three replicates. Spats were counted and measured at 45-day intervals, while the environmental data were measured every two weeks. Identification of oyster species occurred by genetic testing (multiplex PCR) by randomly selecting individuals by sampling. Results indicated spat capturing was significantly influenced by the collector type, location and period of collection (P<0.05, MANOVA) with significantly higher recruitment in the PVC collector (P<0.05, Tukey test). Oyster recruitment occurred throughout the year, suggesting that these individuals reproduce during all months; however, months with less rain and greater salinity were the best for spat collection, while the rainy period with lower salinity proved to be the best for individuals growth. The location in interaction with the environmental variables, mainly salinity, has a significant effect on the recruitment rate of spat and on their size, so that point II (mangrove) had the best results for recruitment and point I (raft) provided the spats of the largest size. Genetic identification verified two native oysters species (Crassostrea gasar and Crassostrea rhizophorae) in both points (I and II).

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Section: Discussionsupporting

confidence: 90%

Recruitment of oyster in artificial collectors on the Amazon macrotidal mangrove coast

Funo¹,

Antônio

Marinho

et al. 2019

Cienc. Rural

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“…Cultured C. gasar oysters became mature and present several spawning peaks during most parts of the year (PAIXÃO et al, 2013;RAMOS et al, 2014). It is important to consider that the oyster growth data presented here represents the mean of two different oyster species, which were likely pulled down by the species with the worst performance.…”

Section: Discussionmentioning

confidence: 99%

Growth, mortality and susceptibility of oyster Crassostrea spp. to Perkinsus spp. infection during on growing in northeast Brazil

Scardua

Vianna

Duarte

et al. 2017

Rev. Bras. Parasitol. Vet.

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Crassostrea rhizophorae and C. gasar oysters are cultivated in the northeast region. Perkinsus parasites infect bivalves, and their effects on oysters from tropical regions are poorly understood. This study evaluated the impact of Perkinsus infection on the productive traits of native oysters. Oysters were sampled bimonthly during 7 months, from July 2010 to February 2011, to evaluate growth rate, mortality and shell color patterns (white and dark-gray) (n = 500), and to determine the prevalence and intensity of Perkinsus (n = 152). Perkinsus and Crassostrea species were determined using molecular tools. Results showed that most dark-gray (90%, n = 20) and white (67%, n = 18) oysters were C. gasar and C. rhizophorae, respectively. Oysters showed a high growth rate and moderate cumulative mortality (44%). C. gasar oysters grew better and showed lower mortality and lower incidence of Perkinsus compared to C. rhizophorae. The mean prevalence of Perkinsus was moderate (48%), but the infection intensity was light (2.2). Perkinsosis affected very small oysters (19.4 mm). In conclusion, native oysters, especially C. gasar, have a great potential for culture, mortality is not associated with perkinsosis, and the shell color of oysters can be used to improve selection for spats with better performance.

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“…There are significant variations in bivalve reproductive cycles that are associated with environmental variables. Reproductive cycles are controlled by specific endogenous rhythms synchronised by external factors such as temperature (Berthelin et al., ; Mann, ; Thompson, ; Weiss, Currant, Peterson, & Gobler, ), food (Dridi, Rhomdhane, & Elcafsi, ; Enríquez‐Díaz, Pouvreau, Chávez‐Villalba, & Le Pennec, ; Ruiz, Abad, Sedano, Garcia‐Martin, & Sanchez Lopez, ), salinity (Paixão, Ferreira, Nunes, Fonseca‐Sizo, & Rocha, ) and photoperiod (Fabioux, Huvet, Le Souchu, Le Pennec, & Pouvreau, ).…”

Section: Introductionmentioning

confidence: 99%

Reproduction of the introduced oyster Crassostrea gigas (Bivalvia: Ostreidae) cultured on rafts in Spain

Antônio

Camacho

2018

Acta Zoologica

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The oyster Crassostrea gigas was introduced in Spain for aquaculture purposes; however, until now, it is not known whether populations are established in the wild, being necessary to define whether this species is spawning and which environmental variables trigger this process. The influence of environmental parameters on the reproduction of C. gigas was evaluated from January 2008 to October 2009 with oysters grown on a raft in the Ría de Arousa (Galicia, NW Spain). Temperature and chlorophyll a are directly correlated to sexual maturation. Oysters can mature at temperatures below 14°C. The temperature necessary for spawning differs between the sexes, requiring a temperature above 15°C for males and 18°C for females.Females had a single massive spawn between June and September, while males had partial spawning from May to December with two peaks, one in May-September and another in October-December, with the second peak more pronounced. The first spawning peak is related to high temperatures and concentrations of chlorophyll a, and the second spawning peak is mainly related to the food availability in the water.The spawning asynchrony may be impeding establishment of wild C. gigas populations in Spain. K E Y W O R D Schlorophyll a, mollusc, reproductive biology, spawning, temperature

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Effects of salinity and rainfall on the reproductive biology of the mangrove oyster (Crassostrea gasar): Implications for the collection of broodstock oysters

Cited by 40 publications

References 15 publications

Recruitment of oyster in artificial collectors on the Amazon macrotidal mangrove coast

Recruitment of oyster in artificial collectors on the Amazon macrotidal mangrove coast

Growth, mortality and susceptibility of oyster Crassostrea spp. to Perkinsus spp. infection during on growing in northeast Brazil

Reproduction of the introduced oyster Crassostrea gigas (Bivalvia: Ostreidae) cultured on rafts in Spain

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