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Gonad morphology and reproductive cycle of the mangrove oyster C rassostrea brasiliana ( L amarck, 1819) in the baía de G uaratuba, P araná, B razil
Author(s) -
CastilhoWestphal Gisela G.,
Magnani Francesco P.,
Ostrensky Antonio
Publication year - 2015
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/azo.12055
Subject(s) - biology , oyster , mangrove , gonad , vitellogenesis , histology , intertidal zone , bay , zoology , anatomy , ecology , fishery , oocyte , embryo , genetics , civil engineering , engineering
This study aimed to describe the gonadal histology and the reproductive cycle of C rassostrea brasiliana in the mangroves of G uaratuba B ay in southern B razil. Adults were collected monthly from J anuary 2010 to A pril 2011 from three sampling sites in intertidal oyster beds. The animals were evaluated using biometric and histological analyses of the gonads. The gonadal tissue samples were processed according to the standard histological procedures, and permanent slides were prepared using H arris' haematoxylin and eosin. The oysters were identified at the species level using a molecular protocol. Females (69%) predominated over males (26%), with 4% indeterminate and 1% hermaphroditic. Mature females were more prevalent in F ebruary, M arch and D ecember 2010 and in M arch 2011. Mature males were more prevalent in F ebruary and A pril 2010 and in M arch 2011. The presence of hermaphroditic individuals was sporadic, and oysters in immature stages or sexual repose were observed in only a few collections between the months of M ay and O ctober 2010. The reproduction of C . brasiliana in G uaratuba Bay occurs intermittently, but with greater intensity during the summer, with a larger number of females produced.