ABSTRACT

Boarfish, Capros aper (Linnaeus, 1758), is a demersal species with a wide distribution in the eastern Atlantic Ocean and the Mediterranean Sea. Boarfish is a common by-catch species of the bottom-trawl fisheries and, over the last two decades, its landings have been increasing in the Atlantic. In the Mediterranean Sea, its landings are not being recorded by any country and the data on its biology are rather limited. The present work aims to determine the lifespan and growth parameters of the boarfish in the Aegean and Ionian Sea (Greece) and provide data on its feeding habits and related morphological relationships. Overall, 406 individuals were collected during the summer of 2014 and their total weight (W, g), total length (TL, cm), vertical (VMO, mm), horizontal (HMO, mm) mouth openings were measured, and stomach contents were examined. Ageing was performed based on cracked and burned otolith readings. The growth parameters were estimated as L_∞ = 11.19cm, K = 0.27 y⁻¹, t₀ = −0.57 y for the Aegean Sea and as L_∞ = 10.43cm, K = 0.21 y⁻¹, t₀ = −3.41 y for the Ionian Sea. In both areas boarfish prefers feeding on Crustacea with Polychaeta, Annelida, Mollusca and Hydrozoa also participating in its diet. Finally, its trophic level was 3.27 ± 0.48 for the Aegean and 3.11 ± 0.29 for the Ionian Sea.

摘要

ar鱼，Capros aper（Linnaeus，1758年），是一种深海物种，在东部大西洋和地中海广泛分布。公猪是底拖网渔业的常见副渔获物，在过去的二十年中，其在大西洋的登陆量一直在增加。在地中海，任何国家都没有记录其登陆，其生物学数据非常有限。本工作旨在确定爱琴海和爱奥尼亚海（希腊）中公鱼的寿命和生长参数，并提供有关其饲养习惯和相关形态关系的数据。总体上，在2014年夏季收集了406个人，测量了他们的总重量（W，g），总长度（TL，cm），垂直（VMO，mm），水平（HMO，mm）张口和胃内容物被检查了。基于破裂和燃烧的耳石读数进行老化。生长参数估计为L 对于爱琴海 ，_∞ = 11.19cm，K = 0.27 y ^-1，t ₀ = -0.57 y，对于 爱奥尼亚海，_L∞ = 10.43cm，K = 0.21 y ^-1，t ₀  = -3.41 y。在这两个地区，公鱼都喜欢以甲壳纲为食，同时也要吃宝鸡，An鱼，软体动物和水生动物。最后，爱琴海的营养水平为3.27±0.48，爱奥尼亚海的营养水平为3.11±0.29。