Sequeira V, Couto E, Neves A, Vieira A R, Paiva R B, Canario A V M, Gordo L S
MARE-Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal.
CCMAR-Centre for Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal.
J Fish Biol. 2017 May;90(5):2157-2169. doi: 10.1111/jfb.13299. Epub 2017 Mar 21.
Two hundred and seven individuals (103 females and 104 males) of bluemouth Helicolenus dactylopterus (Scorpaeniformes, Sebastidae), a commercially important deep-water species with an unusual reproductive strategy, from the eastern Atlantic Ocean ranging from 13·9 to 37·5 cm total length (L ) were analysed from September 2011 to October 2012. The analysis included gonad maturity phases and blood-plasma levels of oestradiol-17β (E ), 11-ketotestosterone (11-KT) and 17,20β-dihydroxypregn-4-en-3-one (17,20β-P). Results confirmed the existence of an annual reproductive cycle with asynchrony between females and males and a spawning season from January to May. A pronounced peak in 17,20β-P in October for both sexes was associated with possible mating behaviour and recent copula. Levels of E increased preceding the elevation of the gonado-somatic index during ovarian growth and were lower during regression and regeneration. The frequency distribution of oocyte-embryonic stages and variation of hormone levels suggest the existence of daily rhythms. Fertilization was detected between 2000-0000 and 0800-1200 h and spawning took place throughout the day peaking between 2000 and 0000 h. The cyclic pattern of sex steroids and ovarian recruitment provides a new insight into the reproductive strategy of this species.
2011年9月至2012年10月，对207条叉线绒杜父鱼（鲉形目，绒杜父鱼科）进行了分析，该鱼是一种具有特殊繁殖策略的重要商业深水物种，来自东大西洋，全长13.9至37.5厘米（L）。其中雌性103条，雄性104条。分析内容包括性腺成熟阶段以及血浆中雌二醇-17β（E）、11-酮睾酮（11-KT）和17,20β-二羟基孕甾-4-烯-3-酮（17,20β-P）的水平。结果证实存在年度繁殖周期，雌雄之间存在异步性，产卵季节为1月至5月。10月份两性的17,20β-P均出现明显峰值，这与可能的交配行为和近期交配有关。在卵巢生长过程中，E水平在性腺-体指数升高之前升高，在退化和再生期间较低。卵母细胞-胚胎阶段的频率分布和激素水平的变化表明存在日节律。受精发生在20:00-00:00和08:00-12:00之间，产卵在全天进行，在20:00至00:00之间达到峰值。性类固醇和卵巢募集的循环模式为该物种的繁殖策略提供了新的见解。
