사료 내 일인산칼륨 수준이 Hybrid 바이오플락 아쿠아포닉 시스템 내 황쏘가리(Siniperca scherzeri) 및 엽채류 4종의 생산성과 수질변화에 미치는 영향

초록

This study investigated the effects of dietary monobasic potassium phosphate (MKP) on the growth of gold mandarin fish and four leafy vegetables in a hybrid biofloc technology aquaponic system (HBFT-AP). Fish were fed a type of a dough mixed with water and mash diet containing MKP (MKP 0.0%, 1.5% and 3.0%) for 8 weeks. The experiment was designed to stabilize water quality using diet without MKP for 1-4 weeks and examined the effect of the three diets on productivity of the fish and leafy vegetables in the HBFT-AP for 5-8 weeks. After the 8-week feeding trial, the growth factors of fish fed three diets were not significantly different (P>0.05), but hematological factors (hemoglobin, inorganic phosphorus and potassium) were significantly different (P<0.05). Inorganic nitrogen compounds and phosphate were measured six times a week using reagent measurements. The TAN (0.12-2.12 mg/L), NO3-N (9.0-23.7 mg/L) and PO4-P (6.12-25.80 mg/L) levels increased with time, while the NO2-N level remained below 0.1 mg/L. MKP 3.0% group had a higher leafy weight (g) in 3 kinds of cultivar (caipira, manchu perilla leaf, ezatrix ) compared to those of other groups (MKP 0.0% and MKP 1.5%). The present results suggested that dietary MKP could improve growth of leafy vegetables in aquaponics.

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