The Reproductive Cycle of the Patagonian scallop Zygochlamys patagonica in SW Atlantic, Argentina

SILVANA CAMPODÓNICO; MACCHI, G.; BETINA JUDITH LOMOVASKY; MARIO LASTA,

The Journal of Marine Biology Association U.K.

Cambridge University Press

Lugar: Cambridge; Año: 2008 vol. 88 p. 603 - 611

0025-3154

The reproductive cycle of Zygochlamys patagonica was studied from October 1999 to February 2001 in a bed located in the SW Atlantic (Reclutas bed 39°24? S - 55°56? W). Scallops were collected monthly and the sexual maturity stages were determined histologically (n = 508). Sex ratio was 1:1 (T-test P > 0.05). The size of first sexual maturity was estimated from males of an average of 36.63 mm and females of 36.31 mm of shell height. The relative gonadal condition index (RGCI) showed an annual cycle, with higher values during winter-spring and lower values during summer-autumn; an inverse relationship for the relative muscle condition index (RMCI) was observed with maximum values in early summer. Thus, a reallocation of energy from soma to gonad appears to be inevitable to meet energy demand of gonad development. Seven histological stages of sexual maturity were established for both sexes: (1) Immature, (2) Early maturity, (3) Advanced maturity, (4) Ripe, (5) Spawning, (6) Spent and, (7) Recovery. Individuals in early and advanced maturity were found throughout the year; however, they were more frequently between June and September. Spawning began in October (early spring) and extended through March (late summer-early autumn) coexisting with early and advanced maturity stages supported by the annual variation of the RGCI and the food availability into the system.