한국수산과학회

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  • pISSN : 2234-8395
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  • eISSN : 2234-1757

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kfas, vol. 52, no. 2, pp.159-172, April, 2019
DOI. https://doi.org/10.5657/KFAS.2019.0159

Effect of Dietary Monobasic Potassium Phosphate Levels on Water
Quality and the Growth of Far Eastern Catfish Silurus asotus and Four
Leafy Vegetables in a Hybrid Biofloc Technology Aquaponic System
사료 내 일인산칼륨(MKP) 수준이 Hybrid 바이오플락(BFT) 아쿠아포닉
시스템 내 메기(Silurus asotus) 및 엽채류 4종의 생산성과 수질변화에
미치는 영향

이동훈·김진영1·임성률·김달영·김주민2·신승준3·김정대3*
경기도해양수산자원연구소, 1경기도농업기술원, 2세븐필라, 3강원대학교

This study investigated the effects of dietary monobasic potassium phosphate (MKP) on the growth of the far eastern
catfish Silurus asotus and four leafy vegetables in a hybrid biofloc technology aquaponic system. To an experimental
diet containing 45% protein and 7% lipid, 1, 2, 3 or 4% MKP was added and was designated as MKP1, MKP2,
MKP3, and MKP4, respectively. The optimum MKP levels were determined for the growth of fish and four leafy vegetables
over 10 weeks. After the 10-week feeding trial, weight gain, feed efficiency, specific growth rate and protein
efficiency ratio were higher in the fish groups fed MKP2 and MKP3 than in the other groups (P<0.05). The growth of
the four leafy vegetables was also higher in the fish groups fed MKP2 and MKP3. Water quality [dissolved oxygen,
pH, water temperature, electrical conductivity, turbidity, total ammonia nitrogen (TAN), NO2-N, NO3-N and PO4-P]
was measured six times a week using a portable water quality meter and reagent measurements. The TAN (4.58-20.40
mg/L), NO3-N (24.12-52.40 mg/L) and PO4-P (20.38-48.48 mg/L) levels increased with time, while the NO2-N level
remained below 0.1 mg/L throughout the study.

Keyword : Silurus asotus, Monobasic potassium phosphate (MKP), Aquaponics, Vegetables, Hybrid biofloc technology

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