Smith Vera-Mera, Diego Mejía, Christopher Mera, Michael Vélez-Soledispa, Jesús Briones-Mendoza, Felipe Galván-Magaña, Steven Tamayo-Vega
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引用次数: 0
摘要
短鳍灰鲭鲨（Isurus oxyrinchus）是一种分布广泛的掠食性鲨鱼。然而，在一些地区，人们对其生物学的关键方面仍然知之甚少，包括厄瓜多尔太平洋，在那里它是最常被捕获的鲨鱼物种之一。对238例椎体标本进行了分析，其中女性119例（长度82 ~ 228 cm， 0 ~ 15岁），男性115例（长度76.4 ~ 248 cm， 0 ~ 16岁），无性个体4例（长度194 ~ 215 cm， 10 ~ 14岁）。von Bertalanffy模型最适合雄性（L∞271.31 cm TL, L0 = 75.85 cm TL, k = 0.10 year−1）和雌性（L∞347.53 cm TL, L0 = 76.04 cm TL, k = 0.06 year−1）。结果显示雌雄二态性，雌性比雄性体型更大，生长速度更慢。厄瓜多尔太平洋的短鳍灰鲭鲨生长缓慢，根据其生活史特征，容易受到过度捕捞，因此有必要进行捕捞管理以维持渔业。
Age and Growth of the Shortfin Mako Shark, Isurus oxyrinchus (Rafinesque, 1810), in the Ecuadorian Pacific Ocean
The shortfin mako shark (Isurus oxyrinchus) is a widely distributed predatory species. However, critical aspects of its biology remain poorly understood in several regions, including the Ecuadorian Pacific Ocean, where it is one of the most commonly captured shark species. Vertebral samples of 238 specimens were analyzed, including 119 females (82–228 cm TL; 0–15 years), 115 males (76.4–248 cm TL; 0–16 years), and 4 unsexed individuals (194–215 cm TL; 10–14 years). The von Bertalanffy model provided the best fit for males (L∞ 271.31 cm TL, L0 = 75.85 cm TL, k = 0.10 year−1), and females (L∞ 347.53 cm TL, L0 = 76.04 cm TL, k = 0.06 year−1). The results indicated sexual dimorphism, with females reaching a larger size and exhibiting slower growth rates compared with males. The shortfin mako shark in the Ecuadorian Pacific Ocean grew slow, and based on its life history characteristics, is vulnerable to overexploitation, thereby necessitating harvest management to sustain a fishery.
期刊介绍：
Fisheries Management and Ecology is a journal with an international perspective. It presents papers that cover all aspects of the management, ecology and conservation of inland, estuarine and coastal fisheries.
The Journal aims to:
foster an understanding of the maintenance, development and management of the conditions under which fish populations and communities thrive, and how they and their habitat can be conserved and enhanced;
promote a thorough understanding of the dual nature of fisheries as valuable resources exploited for food, recreational and commercial purposes and as pivotal indicators of aquatic habitat quality and conservation status;
help fisheries managers focus upon policy, management, operational, conservation and ecological issues;
assist fisheries ecologists become more aware of the needs of managers for information, techniques, tools and concepts;
integrate ecological studies with all aspects of management;
ensure that the conservation of fisheries and their environments is a recurring theme in fisheries and aquatic management.
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