태양열 온수기로부터 획득한 $50{sim}60^{circ}C$의 온수를 이용하여 수온이 낮은 3, 4, 10, 11월은 물론 한 겨울철에도 미꾸리의 최적 성장온도를 유지시켰던 바 다음과 같은 결과를 얻었다. 가. 전장 $4{sim}5cm$, 체중 $1{sim}2g$정도의 미꾸리의 최적 성장수온은 $18{sim}20^{circ}C$이고 $5{sim}7cm,;2{sim}3g$인 것은 $20{sim}22^{circ}C$이고 $7{sim}9cm,;4{sim}6g$인 것은 $22{sim}24^{circ}C$의 수온임을 알아냈다. 나. $1{sim}3g$의 개체는 서서히 성장하나 $4{sim}8g$의 것은 성장이 빠르고 총개체수의 무게 총량은 1개월간에 약 $30{sim}50g$ 증가하였다.
We have maintained the optimum water temperature for misgumus in winter season by solar thermal heating energy. The optimum temperatures for the misgumus anguillicaudatus were experimentally estimated, i.e. for the total length $4{sim}5cm$ and body weight $1{sim}2g$, the optimum temperature was $18{sim}20^{circ}C$. For the total length $5{sim}7cm$, body weight $2{sim}3g$ was $20{sim}22^{circ}C$ and for the total length $7{sim}9cm$, body weight $4{sim}6g$ was $22{sim}24^{circ}C$. The smaller misgumas($1{sim}3g$) grows relatively slow but the bigger one($4{sim}8g$) grows relatively fast and total average body weight increment was about $30{sim}50g$ per month.
