Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

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• 作者：Ana Rita Vieira ; Vera Sequeira ; Ana Neves…
• 刊名：Helgoland Marine Research
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：70
• 期：1
• 全文大小：2,416 KB
• 刊物主题：Ecology; Oceanography; Microbiology; Plant Sciences; Zoology; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution;
• 出版者：Springer Berlin Heidelberg
• ISSN：1438-3888
• 卷排序：70

文摘

Knowing fish reproductive strategy is essential for understanding population dynamics. This study intends to define the spawning season, length at first maturity, fecundity type, and estimate fecundity of forkbeard, Phycis phycis, from the Portuguese coast. Monthly samples collected from commercial landings between May 2011 and December 2012 were used. Results show that forkbeard is a group-synchronous and batch spawner species. Mature females were found between September and January, mature males were found between August and January, and a significant concomitant increase in gonadosomatic index suggests a spawning season from September to January. Length at first maturity was estimated as 35.9 and 28.5 cm TL for females and males, respectively. Reproductive abnormalities—mosaic intersex, follicular cysts in ovaries, and early mature males—were detected. For fecundity-type definition, a hiatus between primary and secondary growth oocytes was detected. A significant increase in the mean diameter of secondary growth oocytes and a decreasing trend in their number during the spawning season were observed. The intensity of α-atresia was low throughout the spawning season. These four criteria suggest that forkbeard has determinate fecundity. Mean relative annual fecundity estimated was 1833 ± 857 oocytes g−1 gutted weight. Non-reproductive females that skipped a spawning season attained 36.1 %.KeywordsReproductive strategyFirst maturityDeterminate fecunditySkipped spawningForkbeardPhycis phycis