[논문]순환여과양식시스템에서 광주기 및 어체 크기가 대서양연어(Salmo salar)의 Off-season Smolt 생산에 미치는 영향

김유희; 김병기

doi:10.5657/kfas.2022.0894

순환여과양식시스템에서 광주기 및 어체 크기가 대서양연어(Salmo salar)의 Off-season Smolt 생산에 미치는 영향
Effects of Photoperiods and Body Size on the Off-season Smolt Production of Atlantic Salmon Salmo salar in a Recirculating Aquaculture System 원문보기

한국수산과학회지 = Korean journal of fisheries and aquatic sciences, v.55 no.6, 2022년, pp.894 - 902

김유희 (강원도립대학교 스마트해양양식과) , 김병기 (강원도립대학교 스마트해양양식과)

Abstract ▼ AI-Helper

This study investigated the effects of photoperiod (NL 12L:12D and LL 24L:0D) and body sizes (30 g and 50 g) on parr-smolt transformation, post-smolt growth and blood properties in the off-season parr-smolt stage of Atlantic salmon reared in a recirculating aquaculture system (RAS). Potential off-season salmon smolt were reared in a freshwater RAS for 80 days and then all experimental fish were transferred to seawater. In both LL groups (LL-30 and LL-50), we recorded and increase in specific growth rate and reduction in feed conversion, although there were no significant difference in body size. The values of osmolality, and serum Na+, Cl- and cortisol concentrations in the LL groups were maintained at lower levels than in NL group fish, and LL group fish were observed to recover to the pre-seawater adaptation state more rapidly than those in the NL group. ID chips were inserted in all smolts reared in freshwater. These fish were subsequently transferred to full-strength seawater and thereafter individual growth rates were monitored for 120 days. The results indicated that compared with smolt reared under natural photoperiodic condition, 24 h lighting in freshwater contributed to enhancing post-smolt specific growth rate in seawater.

주제어

표/그림 (7)

$Fig. 1. Experimental recirculating aquaculture system for Atlantic salmon Salmo salar parr-smolt. 1, Culture tank; 2, Sump; 3, Settling chamber; 4, Circulating pump; 5, Foam fractionators; 6, Venturi pump for foam fractionators; 7, Trickling biofilter; 8, Drain pipe; 9, Outlet pipe; 10, Inlet pipe; 11, Circulation pipe.$ 그림 Fig. 1. Experimental recirculating aquaculture system for Atlantic salmon Salmo salar parr-smolt. 1, Culture tank; 2, Sump; 3, Settling chamber; 4, Circulating pump; 5, Foam fractionators; 6, Venturi pump for foam fractionators; 7, Trickling biofilter; 8, Drain pipe; 9, Outlet pipe; 10, Inlet pipe; 11, Circulation pipe.
표 Table 1. Water qualities of Atlantic salmon Salmo salar parr-smolt rearing tank in seawater RAS for 120 days after seawater acclimatization
표 Table 2. Growth performance of Atlantic salmon Salmo salar parr-smolt by photoperiod and sizes in freshwater for 80 days
표 Table 3. Water qualities of Atlantic salmon Salmo salar parr-smolt rearing tanks for 80 days in freshwater RAS
그림 Fig. 2. Blood analysis (stress related) of Atlantic salmon Salmo salar parr-smolt reared at different photoperiod and sizes before and after adaptation of seawater. NL, Natural light regime; LL, 24 h continuous light regime. The zebra patterns of column mean 3 day of seawater adaptation period. The different letters of columns denote significant different (P<0.05).
그림 Fig. 3. Blood analysis (electrolyte related) of Atlantic salmon Salmo salar parr-smolt reared at different photoperiod and sizes before and after adaptation of seawater. NL, Natural light regime; LL, 24 h continuous light regime. The zebra patterns of column mean 3 day of seawater adaptation period. The different letters of columns denote significant different (P<0.05).
표 Table 4. Growth performance of Atlantic salmon Salmo salar parr-smolt by photoperiod and sizes in seawater for 120 days

AI 본문요약
AI-Helper

문제 정의

따라서 본 연구에서는 대서양연어 발안란을 노르웨이로부터 수입하여 사육한 parr를 대상으로 RAS 내에서 광주기 조절과 어체 크기에 따른 parr-smolt의 성장과 혈액성상의 변화를 조사하고, 해수에서 post-smolt의 성장도를 비교하여 RAS를 활용한 smolt 생산 효율을 비교 검토하였다.

제안 방법

각 수조마다 10–19 마리에(n=반복구) 개체 인식 ID chip을 삽입한 후 4일간의 해수 순치 기간을 거쳐 34 psu 해수에서 실험구의 모든 어류를 같은 시스템에서 무지개송어용 상품사료를 1일 2회 만복 공급하면서 약 120일간 공동 사육하면서 성장도를 조사하여 smolt 생산 조건의 적합성을 판단하였다.
대서양연어의 주 서식지인 북유럽의 환경과 다른 우리나라의 환경에 이식하여 off-season smolt 생산에 미치는 인공조명과 크기의 효과를 조사하기 위하여 80일간 24시간 인공조명을 실시하였다. 80일간 크기별로 광주기를 조절하면서 담수 RAS 시설에서 사육한 결과 LL 실험구에서 시작시 평균 체중 30 g 급과 50 g 급 모두 NL 실험구보다 유의적으로 사료계수가 우수하였고 일간성장율(specific growth rate, SGR)이 높았다(P>0.
실험구별로 담수에서 parr-smolt의 사육 실험을 실시한 후 연이어 해수 순치하여 post-smolt의 성장도를 평가하였다. 각 수조마다 10–19 마리에(n=반복구) 개체 인식 ID chip을 삽입한 후 4일간의 해수 순치 기간을 거쳐 34 psu 해수에서 실험구의 모든 어류를 같은 시스템에서 무지개송어용 상품사료를 1일 2회 만복 공급하면서 약 120일간 공동 사육하면서 성장도를 조사하여 smolt 생산 조건의 적합성을 판단하였다.

데이터처리

16.0 프로그램을 사용해 ANOVA로 검증한 후, P<0.05 수준에서 Duncan’s multiple range test로 유의성을 비교하였다.

성능/효과

80일간 크기별로 광주기를 조절하면서 담수 RAS 시설에서 사육한 결과 LL 실험구에서 시작시 평균 체중 30 g 급과 50 g 급 모두 NL 실험구보다 유의적으로 사료계수가 우수하였고 일간성장율(specific growth rate, SGR)이 높았다(P>0.05, Table 2)

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