Effects of salinity on fertilization and larviculture of the mangrove oyster,  Crassostrea gasar  in the laboratory

Legat, J. F. A.; Puchnick‐Legat, Angela; Gomes, Carlos Henrique Araújo de Miranda; Sühnel, Simone; Melo, Cláudio

doi:10.1016/j.aquaculture.2016.11.016

Cited by 20 publications

(8 citation statements)

References 11 publications

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“…Legat, et al. (2017) evaluated the effects of salinity on fertilization and the larval development of C. gasar , reporting that fertilization and larva‐D development occurred between salinities 21 and 35, yet only larvae cultivated in salinities 28 and 35 reached the settlement stage. Additionally, in the laboratory setting, both fertilization and development of the embryos and larvae were enhanced in salinity 28.…”

Section: Discussionmentioning

confidence: 99%

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Reproductive cycle of the mangrove oyster, Crassostrea gasar (Adanson, 1757), in tropical and temperate climates

et al. 2020

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The reproductive cycle of Crassostrea gasar oysters from a single origin (Federal University of Santa Catarina hatchery) was studied by culturing the species for 1 year in four distinct areas of Brazil; two of which were in tropical climates (02°44′S, 41°58′W; 02°47′S, 41°55′W) and two in temperate climates (26°28′S, 48°50′W; 27°35′S, 48°32′W). In each area, 20 individuals were collected each month for reproductive cycle analysis using standard histological techniques. Oysters cultivated in tropical climates demonstrated intermittent reproductive cycles, with individuals spawning throughout the year and rarely entering a resting stage. Oysters cultivated in temperate climates demonstrated spawning periods associated with increases in water temperatures, occurring in late spring and summer. Resting stages were clearly seen in samples from latitudes of 26 and 27 °S, with approximately 75% to 100% of the individuals in this stage between May and July.

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Section: Discussionmentioning

confidence: 99%

“…Crassostrea gigas , however, is restricted to cold seawater temperature areas (Poli, 2004). Thus, the expansion of oyster farming in Brazilian tropical waters is linked to the domestication and the development of technological basis for native species (Legat, et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Reproductive cycle of the mangrove oyster, Crassostrea gasar (Adanson, 1757), in tropical and temperate climates

et al. 2020

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“…AQUAVILA, where mean salinity varied seasonally between 8.1 and 22.7, is the major supplier of wild-harvested seed in Pará. Very low salinity (5 -7) is associated with poor growth and survival of seed (Funo et al 2015;Legat et al 2017b) and adult C. gasar (Oliveira et al 2018). Survival and growth of C. gasar seed in the laboratory were highest in intermediate salinities (20 -25), but remained very high between 10 and 45 (Funo et al 2015) or tolerated 21 -35 with optimal results at 28 (Legat et al 2017a).…”

Section: Source Of Variationmentioning

confidence: 99%

Variation in environmental characteristics of waters among Amazon coast oyster culture units

et al. 2020

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Oyster culture has benefited traditional coastal communities along the Amazon macrotidal mangrove coast of Pará state in Brazil since 2006. Currently, seven oyster culture units in five municipalities are expanding production, but with no environmental monitoring, which is important for the control of the impacts of oyster culture on waters as well as for oyster management and conservation. Seasonal variation in environmental characteristics of the water was evaluated at all oyster culture units in Pará, from September to November 2013 (dry season) and February to April 2014 (wet season), to generate baseline data to evaluate future impacts and aid strategic planning, such as diversifying seed production. Salinity, dissolved oxygen, pH, oxidation-reduction potential, depth, temperature, and chlorophyll-a concentration were measured during flooding and ebbing tides, and compared between seasons and among culture units using uni- and multivariate statistics. All variables were significantly higher in the dry season, except depth, which was significantly greater in the wet season. Mean salinity, which varied from 2.4 to 46, explained most of the variation among culture units in relation to season, sampling date within each season and tidal state. However, dissolved oxygen, pH and depth were also important. Oyster culture units in Pará may be suitable for sustainable harvesting of seed/spat from the wild (lower salinity and pH), or for on-growing (higher salinity, higher pH, and greater depth). Seasonal variation is sufficient to allow both activities at most units at appropriate times of the year, which would help increase oyster production in Pará.

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“…In Brazil, C. tulipa has fair economic importance, and it is cultivated in tropical coastal areas where the cultivation of C. gigas (Thunberg, 1793) is otherwise impractical (Gomes et al, 2014). The preference for farming this mangrove oyster species is based on its faster growth and larger size in comparison to C. rhizophorae (Guilding, 1828) (Legat et al, 2017a), a sympatric species occurring from the US Florida coast to Uruguay (Rios, 2009). Indeed, the exploitation of these oysters in their natural stocks is one of the most recognizable traditional activities along the Brazilian coast (Wakamatsu, 1973), and it serves as a source of income in many communities (Ramos et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The effect of density on the cultivation of the native mangrove oyster Crassostrea tulipa (Lamarck, 1819)

Brunetto

Gomes

Ramos

et al. 2020

Lat. Am. J. Aquat. Res.

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In Brazil, the cultivation of Crassostrea tulipa (= C. gasar) is gaining in importance. However, little is known about the best conditions for farming. Therefore, this study aimed to evaluate the effect of oyster density (50, 100, 200, and 400 mL of seeds/0.15 m2; 100, 200, 300, and 400 ind/0.10 m2 (basket area) and 30, 60, 120, and 180 ind/0.13 m2 (lantern floor area) in nursey, juvenile and adult phase, respectively) on the growth and survival of C. tulipa in farm cultivation. In the nursery phase, the 50 mL density resulted in smaller oyster size, as expressed in height and height/length (H/L) ratio (1.31 ± 0.03 mm), compared to other densities, while the length and width was equal among densities. The animals' individual average weight and H/L ratio were negatively influenced by a density of 100 ind/0.10 m2 or bigger. However, animals grown at the density of 200 ind/0.10 m2 did not differ statistically in length or width from those grown with 100 ind/0.10 m2. A high survival rate (≥98%) was found in the nursery and juvenile phases.

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Effects of salinity on fertilization and larviculture of the mangrove oyster, Crassostrea gasar in the laboratory

Cited by 20 publications

References 11 publications

Reproductive cycle of the mangrove oyster, Crassostrea gasar (Adanson, 1757), in tropical and temperate climates

Reproductive cycle of the mangrove oyster, Crassostrea gasar (Adanson, 1757), in tropical and temperate climates

Variation in environmental characteristics of waters among Amazon coast oyster culture units

The effect of density on the cultivation of the native mangrove oyster Crassostrea tulipa (Lamarck, 1819)

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