Abstract
The effects of the claw size used on the shoes of the traditional sea snail beam trawl and the effect of the steel wire used between the shoes on catching efficiency were investigated on the Samsun coast of the Black Sea. A traditional beam trawl with steel wire and with a claw length of 5.5 cm (T) was compared to modified beam trawls with steel wire (M1) and without steel wire (M2) with a claw size of 0.5 cm. The operations were performed as T-M1 and then T-M2 hauls using the dual parallel towing method. There was no significant difference in the amount of target species in the comparison of T (70.12) and M1 (63.23) according to the average catch per unit effort (CPUE, kg h?1) values obtained (P = 0.399). In the T-M2 comparison, 49% higher CPUE value was achieved with the T (77.37) beam trawl and there was a significant difference in terms of targeted species (P = 0.002). As a result, it was observed by underwater observations that steel wire on the beam trawl had a negative effect on the ground, and it was found that the bycatch ratio with the T beam trawl was higher than that with the modified beam trawl.
Highlights
The first record in the Black Sea for the sea snail (Rapana venosa Val., 1846), a local species of the Japanese Sea, was made in Russia’s Novorossiysk Bay in 1947 [1]
This research is the first study conducted in Turkey about the impact of the structural changes on sea snail beam trawls and benthic ecosystems, and on the target species
The findings revealed that the use of steel wire had a significant effect on the amount of catch of the target species (P < 0.05), Figure 6
Summary
The first record in the Black Sea for the sea snail (Rapana venosa Val., 1846), a local species of the Japanese Sea, was made in Russia’s Novorossiysk Bay in 1947 [1] It was observed in the eastern Black Sea region for the first time in 1962 in Turkey [2]. It was reported that the sea snail had harmful effects on the demersal ecosystem on the coasts of Zmiinyi Island (Black Sea) [5] It is responsible for the collapse of bivalve stocks, it started being caught as an important export species in Turkey in the late 1980s and in Bulgaria in the 1990s [2].
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