CAJ | 학술논문

在90 d的饲养实验中,研究了集约化室内储水池养殖条件下,流速和温度对西伯利亚鲟幼鱼生长的影响.按照流速,实验鱼分为4组:即流速分别为 V1组(0.12 m·s-1),V2组(0.16 m·s-1), V3组(0.20 m·s-1),和V4组 (0.5 h流速为 0.20 m·s-1, 0.5 h流速为 0 的间隙式水流组).水温在13.8 ～24.7 ℃变化. 在16.7～22.5 ℃的温度段内,随着流速增大,幼鱼的最终体重、体长、生长效率、净增重、每日生长率及日增重等指标均逐渐增大,饵料系数逐渐降低,其中西伯利亚鲟鱼的生长效率(GE)与流速(V)之间存在显著正相关性,其关系式为GE＝52.5 V + 69.567 (R2 = 0.997, P＜ 0.05).尽管高流速V3组的特殊生长率(DGR)是最大的,但V3组在22.5～24.7 ℃之间和13.8～16.7 ℃之间时DGR是最小的.间隙式水流V4组(0.5 h流速为0.20 m·s-1,0.5 h流速为0)DGR和净增重(NY)不是最高,但其饵料系数(FC)和生长效率(GE)分别是各组中最低和最高的,而且在高温和低温段DGR均有比其他组升高的趋势.另外,水流因子与温度交互作用影响西伯利亚鲟幼鱼的生长,本次四组流速组西伯利亚鲟幼鱼的最适生长水温各不相同,在20.2～20.7 ℃之间.结果显示在设施集约化养殖中,V4组能够产生较好的效益.
재90 d적사양실험중,연구료집약화실내저수지양식조건하,류속화온도대서백리아심유어생장적영향.안조류속,실험어분위4조:즉류속분별위 V1조(0.12 m·s-1),V2조(0.16 m·s-1), V3조(0.20 m·s-1),화V4조 (0.5 h류속위 0.20 m·s-1, 0.5 h류속위 0 적간극식수류조).수온재13.8 ～24.7 ℃변화. 재16.7～22.5 ℃적온도단내,수착류속증대,유어적최종체중、체장、생장효솔、정증중、매일생장솔급일증중등지표균축점증대,이료계수축점강저,기중서백리아심어적생장효솔(GE)여류속(V)지간존재현저정상관성,기관계식위GE＝52.5 V + 69.567 (R2 = 0.997, P＜ 0.05).진관고류속V3조적특수생장솔(DGR)시최대적,단V3조재22.5～24.7 ℃지간화13.8～16.7 ℃지간시DGR시최소적.간극식수류V4조(0.5 h류속위0.20 m·s-1,0.5 h류속위0)DGR화정증중(NY)불시최고,단기이료계수(FC)화생장효솔(GE)분별시각조중최저화최고적,이차재고온화저온단DGR균유비기타조승고적추세.령외,수류인자여온도교호작용영향서백리아심유어적생장,본차사조류속조서백리아심유어적최괄생장수온각불상동,재20.2～20.7 ℃지간.결과현시재설시집약화양식중,V4조능구산생교호적효익.
Effect of water current and temperature on growth of juvenile sturgeon Acipenser baeri in intensive indoor (semi-recirculating) tank culture was investigated in a 90-day rearing trial. Fish were reared in continuous water current with three levels of velocity of 0.12(V1), 0.16(V2) and 0.20 m·s-1(V3) respectively, and isochronic water current (in half an hour with a velocity of 0.20 m·s-1, then in the next half an hour of intermission with a velocity of 0 m·s-1)(V4), under water temperature varying between 13.8 ℃ and 24.7 ℃. Within a range of water temperature of 16.7 - 22.5 ℃, growth efficiency (GE) and daily growth rate (DGR) increased with the increase of velocity of water current, and maximum DGR occurred in V3 group. There was significant positive linear relation between GE and V: GE＝52.5 V + 69.567 (R2 = 0.997, P＜ 0.05), when the velocity of water current ranged from 0.12 m·s-1 to 0.20 m·s-1. In contrast, within a range of water temperature of 13.8 - 16.7 ℃ or 22.5 - 24.7 ℃, DGR of V3 group were lower than that of V1 and V2 groups. Fish in the group with intermission of non-water current obtained the highest GE while lowest FCR at a water temperature of 20.7 ℃. It suggested that water current and water temperature have reciprocal effect on the growth of juvenile sturgeon A. baeri. The fish has different optimal water temperatures at different velocity of water currents, and the optimum temperatures are between 20.2 ℃ and 20.7 ℃.This result suggests that group V4 is the best among these groups that can produce better economic benefits.