Survival of fish after escape from a 40 mm stretched diamond mesh trawl codend in the Aegean Sea
Survival of fish after escape from a 40 mm stretched diamond mesh trawl codend in the Aegean Sea
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DOI：
10.3989/scimar.2010.74n4755
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发表时间：
2010-12-01
期刊：
影响因子：
1.4
通讯作者：
Tokac, Adnan
中科院分区：
文献类型：
--
作者：
Duzbastilar, Faik Ozan;Aydin, Celalettin;Tokac, Adnan
本研究的目的是确定三种鱼类，棕色精梳机（Herranus hepatus），黑虾虎鱼（Gobius尼日尔）和环形海鲷（Diplodus annularis），逃生后的40 mm拉伸金刚石网聚乙烯（PE）囊的存活率。2007年9月在地中海东部进行了实验，使用的是口部周围有600目的传统底拖网。所有牵引均使用恒定的15 min牵引持续时间。拖曳速度在2.0节和2.5节之间变化。由两个箍支撑的囊盖被用来留住逃跑的鱼。每次打捞结束时，将这些覆盖物从囊袋上拆下，固定在19至28 m深处的海底，然后由潜水员观察7天。到了第八天，揭开所有的盖，计算和测量幸存者和死亡者。开囊和实验笼的平均成活率分别为：褐精梳机97.1%和98.3%，黑虾虎鱼69.0%和77.2%，环纹鲷97.5%和98.6%。
This study aimed to determine the survival rates of three fish species, the brown comber (Serranus hepatus), black goby (Gobius niger) and annular seabream (Diplodus annularis), after their escape from a 40 mm stretched diamond mesh polyethylene (PE) codend. Experiments were carried out in the eastern Mediterranean in September 2007 using a conventional bottom trawl with 600 meshes around the mouth. A constant 15 min towing duration was used for all hauls. The towing speed varied between 2.0 and 2.5 knots. Codend covers, supported by two hoops, were used to retain escaping fish. At the end of each haul, these covers were detached from the codend, fixed to the sea floor at depths of 19 to 28 m, and then observed by the divers for a period of seven days. On the eighth day, all of the covers were lifted up and the survivors and mortalities were counted and measured. The mean survival percentages of open codend and experimental cages were found to be 97.1% and 98.3% for brown comber, 69.0% and 77.2% for black goby, and 97.5% and 98.6% for annular seabream respectively.