A Study on Survival and Growth of Ark shell, Scapharca broughtonii with differential density during hanging culture

Abstract

Ark shell Scapharca broughtonii length and total weight growth by density, which was hanging-cultured near the sea area of Yeosu-city, Hoenggan-island (below is Yeosu), showed inverse correlation with density. As for the average growth of shell length by density, the test area of 10 shells showed the best result as 5.21 mm, and it became lower as density became higher. Also, the increase of total weight by density showed the same result, thus on the whole, the increase of average shell length and total weight of 10-20 shell test area showed the better result than the test area of 30-40 shells. In addition, even if the parashell's shell length by density and total weight growth in the sea area of Namhae-gun, Mijo-fishing port (below is Namhae) showed inverse correlation with density, it showed the slighter inverse correlation than the sea area of Yeosu. As for the average growth of shell length by density, the test area of 10 shells showed the best result as 4.55mm, but the average growth of shell length by density in the test area of 20-40 shells appeared to be similar as 3.11, 3.36 and 3.27 mm. On the other hand, as for the increase of total weight by density, the test area of 10-20 shells showed the more increase than the test area of 30-40 shells. In conclusion, it is guessed that the culture density of 20 shells/0.12 m 2 (166 shells / 1 m 2 ) would be appropriate when hanging-culturing the shells. At the sea area of A, the survival rate of Scapharca broughtonii parashell was 68-87% by density respectively, and it showed the density-dependent result, while the survival rate of sea area of Namhae, where phytoplankton as prey is abundant, showed the much better result as 91-100%. It is guessed that this may be due to the fact that the quantity of phytoplankton in sea area of Yeosu is just 55.89% of sea area of Namhae. When hanging-culturing the shells, the water temperature by sea area ranged from 16.22 to 25.66℃, salinity 30. .65 mg/L.

Investigation of interference current distribution in a long line scallop cage aquaculture

“…우리나라에 서식하는 가리비류는 큰가리비 (Patinopecten yessoensis), 흔한가리비 (Chlamys nobilis), 비단가리비 (Chlamys farreri farreri) 등 총 24종이 있다 (Lee and Min, 2002 (Chang, 1991;Park, 1998;Park et al, 2001, Oh et al, 2008, Jo et al, 2009 (Peterson et al, 1989;Zhang and Yichao, 1990;Hegaret et al, 2003;Jie et al, 2005;Akira, 2007; Chen et al, 2007;Jo, 2009;Oh et al, 2010). 이외 에 폐사 관련 연구들로서는 조류의 대량번식과 폐사 (Eckman, 1987;Tracey, 1988;Bricelj et al, 1989;Gallagher et al, 1989;Pohle et al, 1991), 성숙과 산란에 미치는 수온 (Sastry, 1966), 먹이생물의 영향 (Rhodes and Wildman, 1980;Peirson, 1983;Urban and Langdon, 1984) 및 밀도와의 영향 (Song et al, 2002;Duggan, 1973;Oh et al, 2000;Oh et al, 2014)…”