육상 사육 수조에서 쥐노래미 치어의 적정 사육 밀도

Influence of Stocking Density on Growth, Feed Efficiency and Body Composition of Juvenile Fat Cod (Hexagrammos otakii Jordan et Starks) in Indoor Culture System

육상 사육 수조에서의 쥐노래미 적정 사육 밀도를 구명하기 위해 13 g 전후의 치어를 대상으로 250 l FRP 수조(수용적 : 200 l)에 각각 2반복으로 50 (330 g/100 l), 100 (660 g/100 l), 150 (990 g/100 l) 및 200 (1330 g/100 l)마리씩 수용하여 냉동 전갱이와 분말사료를 1 : 1의 비율로 혼합한 moist pellet으로 2개월간 사육 실험하였다. 사육실험한 후의 평균체중, 증체율, 사료효율, 일일사료섭취율 및 단백질 축적율이 수용 밀도가 증가됨에 따라 이 값들이 감소하여 실험 시작시 수용적 100 l당 330 g을 수용한 실험구가 $660\~990 g을 수용한 실험구와는 유의차가 없었지만, 1330 g을 수용한 실험구와는 차이를 보였다(P>0.01).

A growth study was conducted to investigate the effect of stocking density on performance of juvenile fat cod (Hexagrammos otakii Jordan et Starks.). Fish averaging 13 g were stocked into duplicate tanks ($250\;{\ell}$ each) at four different densities of 330 g/$100\;{\ell},\;660\;g/100\;{\ell},\;990\;g/\;100\;{\ell}$, and $1330\;g/100\;{\ell}$, and fed MP diet containing $50\%$ frozen horse mackerel and $50\%$ commercial binder meal for 2 months. Weight gain, feed efficiency, survival rate, and protein retention were decreased as density increased. Whereas these parameters were not significantly different (P>0.01) fish stocked at initial stocking densities of $330\;g/100\;{\ell},\;660\;/g/100\;{\ell}\;and\;990\;g/100\;{\ell}$. Moisture and lipid content of whole body were not affected by stocking densities (P>0.01). These results indicate that stocking density should be considered, and $1{\~}2$ kg fish/$100\;{\ell}$ final stocking density for juvenile fat cod could be used to decrease production cost for the indoor tank (culture) system.