de Oliveira Mônica Rocha, Chellappa Sathyabama
Departamento de Oceanografia e Limnologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Via Costeira Senador Dinarte Medeiros Mariz, Mãe Luíza, s/n, 59.014-002 Natal, RN, Brazil.
ScientificWorldJournal. 2014;2014:837151. doi: 10.1155/2014/837151. Epub 2014 Nov 16.
The reproductive aspects of Hemiramphus brasiliensis were analyzed with a view to verify the temporal dynamics of reproduction. This paper presents data on sex ratio, length at first sexual maturity, macroscopic and histological aspects of gonad development, gonadosomatic index (GSI), reproductive period, and fecundity of H. brasiliensis. The fishes were captured from the coastal waters of Rio Grande do Norte, northeastern Brazil. Females of this species predominated in the sampled population and were larger in size than the males. The length at the first sexual maturation of males was 20.8 cm and that of females was 21.5 cm. The macroscopic characteristics of the gonads indicated four maturation stages. Histological studies of gonads of H. brasiliensis showed six phases of oocyte development and four phases of spermatocyte development. The batch fecundity of this species was 1153 (±258.22) mature oocytes for 50 g body weight of female. The microscopic characteristics of gonad development indicate that H. brasiliensis is a multiple spawner, presenting a prolonged reproductive period during the whole year, with a peak in the month of April, and is considered as an opportunistic strategist.
为了验证巴西半颚鱼繁殖的时间动态，对其繁殖方面进行了分析。本文呈现了巴西半颚鱼的性别比例、初次性成熟体长、性腺发育的宏观和组织学特征、性腺指数（GSI）、繁殖期及繁殖力的数据。这些鱼采自巴西东北部北里奥格兰德的沿海水域。在采样群体中该物种的雌性占主导，且体型比雄性大。雄性初次性成熟时的体长为20.8厘米，雌性为21.5厘米。性腺的宏观特征显示有四个成熟阶段。对巴西半颚鱼性腺的组织学研究表明，卵母细胞发育有六个阶段，精母细胞发育有四个阶段。该物种每50克体重雌鱼的分批繁殖力为1153（±258.22）个成熟卵母细胞。性腺发育的微观特征表明，巴西半颚鱼是多次产卵鱼类，全年繁殖期延长，4月为高峰期，被认为是机会主义策略者。
