Reproductive cycle and size at first sexual maturity of Hexaplex trunculus (Gastropoda: Muricidae) in the Gulf of Gabes (southern Tunisia)

被引：27

作者：

Elhasni, Kamel ^{[1
]}

Ghorbel, Mohamed ^{[1
]}

Vasconcelos, Paulo ^{[2
]}

Jarboui, Othman ^{[1
]}

机构：

[1] Ctr Sfax, INSTM, Sfax 3018, Tunisia

[2] IPIMAR, Inst Nacl Recursos Biol INRB IP, P-8700305 Olhao, Portugal

来源：

INVERTEBRATE REPRODUCTION & DEVELOPMENT | 2010年 / 54卷 / 04期

关键词：

Banded murex; Hexaplex trunculus; general condition index; gonadosomatic index maturation; spawning; LAGOON ALGARVE COAST; ADELOMELON-BRASILIANA NEOGASTROPODA; ZIDONA-DUFRESNEI CAENOGASTROPODA; JUVENILE GROWTH; SEASONAL REPRODUCTION; BANDED MUREX; FEMALE SIZE; VOLUTIDAE; IMPOSEX; RIA;

D O I：

10.1080/07924259.2010.9652335

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The reproductive cycle and size at first sexual maturity of the banded murex (Hexaplex trunculus) from the tidal areas of the Gulf of Gabes (southern Tunisia) were investigated from June 2007 to May 2008 through macroscopic analysis of the gonads and monthly variations in the general condition (K) and gonadosomatic indices (GSI) This muricid gastropod is gonochoristic (separate sexes throughout life) and lacks external sexual dimorphism The overall sex-ratio of the population was significantly unbalanced, with a predominance of females (M F = 1 1 6) The monthly variation in the gonad maturation stages, K and GSI revealed that H trunculus has a yearly reproductive cycle, with both sexes showing a long period of gonadal activity and slightly asynchronous gametogenic cycle Gametogenesis occurred during most of the year (11 out of 12 months examined) and almost every gametogenic stage was observed throughout the study period Ripe males were found mainly from November to January, preceding the main period of gametic emission (between January and May) Ripe females occurred mainly from February to April, preceding the main spawning season (between April and May) apparently triggered by the increasing daylength and seawater temperature during this period (from 13 2 to 14 2 h and from 19 3 to 23 4 degrees C, respectively) Both sexes displayed a relatively short resting phase (males June July, females June September), coincident with the highest daylength and seawater temperature during summer in the Gulf of Gabes The first sexual maturity was reached at a smaller SI7C in males (SL50 = 36 9 mm SL) than in females (SL50 = 40 3 mm SL) The information gathered in this study allowed preliminary management measures for the fishery to be proposed, including a closed season during the main spawning season (April May) and the establishment of a minimum landing size (of at least 40 mm SL) for H trunculus from the Gulf of Gabes

引用

页码：213 / 225

页数：13

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[3]

Azouz A., 1966, Annals Inst natn scient tech Oceanogr Peche Salambo, V15, P1

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