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순환여과양식 시스템 내 감성돔(Acanthopagrus schlegelii) 치어에 미치는 질산성 질소의 만성적 영향

Chronic Effects of Nitrate Nitrogen on Juvenile Blackhead Seabream Acanthopagrus schlegelii in a Recirculating Aquaculture System

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초록

This study evaluated the chronic effects of NO3-N on juvenile blackhead seabream Acanthopagrus schlegelii. The experiment used six identically configured recirculating aquaculture systems (435 L), with three tanks (70 L) each. The NO3-N concentrations studied were 0 (control), 62.5, 125, 250, 500, and 1,000 mg/L NO3-N/L. Thirty juvenile blackhead seabream (18.8±2.2 g) were stocked in each tank. Growth and hematological changes were evaluated after 120 days. At the end of the experiment, the growth, survival, and cortisol levels indicated that blackhead seabream were healthy in 500 mg NO3-N/L. However, insulin-like growth factor I (IGF-1) and the IGF-1 receptor were significantly lower at 250, 500, and 1,000 mg NO3-N/L than in controls (62.5 and 125 mg NO3-N/L). Juveniles were likely affected at a much lower NO3-N concentration than 250 mg/L NO3-N/L in terms of IGF-1 and the IGF-1 receptor. Therefore, for the sake of long-term fish welfare, the NO3-N should be maintained at lower than 250 mg/L for blackhead seabream in recirculating aquaculture systems.

Abstract

This study evaluated the chronic effects of NO3-N on juvenile blackhead seabream Acanthopagrus schlegelii. The experiment used six identically configured recirculating aquaculture systems (435 L), with three tanks (70 L) each. The NO3-N concentrations studied were 0 (control), 62.5, 125, 250, 500, and 1,000 mg/L NO3-N/L. Thirty juvenile blackhead seabream (18.8±2.2 g) were stocked in each tank. Growth and hematological changes were evaluated after 120 days. At the end of the experiment, the growth, survival, and cortisol levels indicated that blackhead seabream were healthy in 500 mg NO3-N/L. However, insulin-like growth factor I (IGF-1) and the IGF-1 receptor were significantly lower at 250, 500, and 1,000 mg NO3-N/L than in controls (62.5 and 125 mg NO3-N/L). Juveniles were likely affected at a much lower NO3-N concentration than 250 mg/L NO3-N/L in terms of IGF-1 and the IGF-1 receptor. Therefore, for the sake of long-term fish welfare, the NO3-N should be maintained at lower than 250 mg/L for blackhead seabream in recirculating aquaculture systems.

참고문헌 (37)

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