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在投食正常、水质良好、生态环境适宜的情况下,河蟹在5—8月这一摄食生长旺季死亡的主要原因是“脱壳不遂”。通常预防方法是在食物中添加脱壳素,但实际效果并不明显。下面把我场在实践中摸索出的一种方法介绍给大家。具体作法:每天晚上10时或凌晨4时左右巡塘,将爬在岸边不动或静伏的河蟹捉住放在特制的脱壳箱内,让其脱壳。刚脱壳的软壳蟹也可以捉来,让其在箱内使外壳由软变硬。脱壳箱用木板做成,也可用水泥或塑料预制。箱内分隔成10厘米×15厘米×20厘米的小方格脱壳箱封闭,并设微孔用以透气(孔可用钻子打通,可
In the normal feeding, water quality is good, the ecological environment is appropriate, crabs in May-August this season, the main reason for the death of feeding growth is “unsuccessful shelling.” The usual preventive method is to add chitin in food, but the actual effect is not obvious. Here’s my field in practice to explore a way to introduce to everyone. Specific practices: every night at 10 o’clock or around 4 am Xuntang, will climb or move in the shore of the quiet crab catches caught in a special shelling box, let the shelling. Soft-shelled soft-shelled crabs can also be caught, allowing them to soften the shell inside the box. Shelling boxes made of wood, can also be precast cement or plastic. The box is divided into 10 cm × 15 cm × 20 cm small box shelling closed, and set the microporous for ventilation (holes can be drilled through the drill can be