In this study, the efficiency of two fishing methods (a) traditional handline commonly used in the Strait of Istanbul and (b) light rock fishing (LRF), which is beginning to spread in recent years, were investigated by monthly sampling between September 2014 and September 2015. One classic handline fishing tackle and one LRF fishing tackle were used in the test fishing exercise. In addition, the effects of the hook sizes (numbers 6, 8 and 10) used in the handline fishery on the size selectivity for horse mackerels were also studied. Catches using both types of fishing gear were mainly composed of Trachurus mediterraneus (89.60%), Scorpeana porcus (5.12%), Sardina pilchardus (1.98%), Atherina boyeri (0.99%), Liza aurata (0.66%), Scorpaena scrofa (0.50%), Pomatomus saltatrix (0.33%), Sprattus sprattus (0.33%) and a few other species. The frequency distributions of horse mackerel caught using handlines and LRF were slightly different and ranged between 6.1–19.0 cm and 9.0–16.0 cm, respectively. Of all the handlines, LRF yielded the highest catch per unit effort (CPUE), 1.295 kg/10 hooks/hour. The log normal model selectivity curve gave the best fit for the T. mediterraneus by using the SELECT method. The modal lengths of horse mackerel caught by handline hook sizes no.10 and no. 8 hook were calculated as 13.4 cm and 17.7 cm, respectively. In addition, the spread values were determined with 3.58 and 4.74, respectively.

中文翻译：

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土耳其伊斯坦布尔海峡两个运动钓鱼区的钩选择性和捕捞效率：经典手钓和轻石捕鱼（LRF）

在这项研究中，通过2014年9月之间的每月抽样调查了两种捕鱼方法（a）伊斯坦布尔海峡常用的传统钓线和（b）近年来开始普及的轻岩捕鱼（LRF）的效率。以及2015年9月。在测试捕鱼练习中使用了一把经典的手动钓具和一个LRF钓具。此外，还研究了在手工渔业中使用的鱼钩尺寸（6、8和10号）对竹荚鱼尺寸选择性的影响。使用两种类型渔具的渔获物主要由Trachurus mediterraneus（89.60％），Scorpeana porcus（5.12％），Sardina pilchardus（1.98％），Atherina boyeri（0.99％），Liza aurata组成（0.66％），赤鲉（0.50％），Pomatomus saltatrix（0.33％），黍鲱（0.33％）和一些其他物种。用手线和LRF捕捞的鲭鱼的频率分布略有不同，分别在6.1-19.0 cm和9.0-16.0 cm之间。在所有机翼中，LRF的单位努力量（CPUE）最高，为1.295千克/ 10钩/小时。通过使用SELECT方法，对数正态模型选择性曲线最适合中间T。用10号和10号手钩钩住的鲭鱼的模态长度。8个钩子分别计算为13.4厘米和17.7厘米。此外，扩展值分别用3.58和4.74确定。