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Growth, mortality and reproductive traits of diploid and triploid Pacific oysters ( Crassostrea gigas , THUNBERG, 1793) in Southern Brazil
Author(s) -
Melo Emílio Mateus Costa,
Sühnel Simone,
Oliveira Ana Cristina Santos de,
Lopes Brenda de Oliveira,
Bachi Gabriela Costa,
De Melo Claudio Manoel Rodrigues
Publication year - 2020
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.14713
Subject(s) - biology , crassostrea , condition index , bay , pacific oyster , ploidy , oyster , fishery , reproduction , zoology , ecology , oceanography , genetics , gene , geology
This work aimed to evaluate the whole weight (g), shell height (mm), mortality (%) and reproductive aspects (condition index and histology) of triploid (3N) Pacific oysters ( Crassostrea gigas ) cultivated in southern Brazil. To accomplish this, a comparative experiment was performed with a diploid (2N) control group in two cultivation sites on Santa Catarina Island: North Bay (NB) and South Bay (SB). Whole weight, height and cumulative mortality were evaluated monthly for eight months and condition index (CI) for six months. Histological analysis was performed every two weeks for four months to investigate reproductive aspects. At the end of the experiment, whole weight and height were similar for 3N and 2N oysters. However, while more growth in whole weight and height was observed in the initial phase of cultivation in NB, such growth was not detected in SB until intermediate and final grow‐out phase. At harvest, cumulative mortality in 3N oysters was similar that in 2N oysters. The results suggest that diploid and triploid oysters grown in southern Brazil have similar developmental patterns based on whole weight and height, as well as reproductive cycle. In addition, cultivation sites have more influence on growth and mortality than ploidy levels.