참돔 Pagrus major 암모니아 배설에 미치는 온도와 수용밀도의 영향

Abstract

Endogenous ammonia excretion rate and exogenous ammonia excretion rate of red sea bream (Pagrus major) were investigated under the combination of four different temperature regimes (10, 15, 20 and 25℃) and two different densities (5.5 and 11 kg m-3). Ammonia excretion was significantly increased with increasing temperature and density. Endogenous ammonia excretions of red sea bream with lower density under 10, 15, 20 and 25℃ were ranged 88.76∼143.26 mg kg-1 d-1, while that under higher density were ranged 105.24∼168.82 mg kg-1 d-1. The relationship between endogenous ammonia excretion rate and temperature in low density was Y=18.746X+67.66 (R2=0.9865) and that in high density was Y=21.306X+80.416 (R2=0.9804). Exogenous ammonia excretions of red sea bream with low density under 10, 15, 20 and 25℃ were ranged 343.48∼601.74 mg kg-1 d-1. On other hand, exogenous ammonia excretion rates in high density were ranged 391.92∼683.40 mg kg-1 d-1. Ration of ammonia excretion to ingested nitrogen of red sea bream with lower density under 10, 15, 20 and 25℃ were ranged 27.92∼50.11%, while that in higher density were ranged 31.65∼56.89%. The relationship between exogenous ammonia excretion (Y) and temperature (T) in low density was Y=90.68T+244.47 (R2=0.9772) and that in high density was Y=100.66T+290.09 (R2=0.9880)