摘要:
2016年5月,将3万尾北方须鳅Barbatula barbatula nuda仔鱼等量放养在玻璃暖棚内的三个水族箱(100cm×50cm×45cm)中,以曝气48h的深井水为水源,水温18°C,24h连续充气,投喂自制微颗粒饲料,培育成平均体质量1.10~1.38g、平均全长5.30~6.04cm的鱼种.再将小规格鱼种养在4个Φ800mm×850mm的圆形塑性桶内,每桶500尾;大规格鱼种养在8个同规格桶内,每桶375尾.桶内24h充气,溶氧量保持在5mg/L以上,养殖水深0.5m,水温16~19°C,每天8:00和18:00投喂鱼体质量3%左右的自制饲料,上午9:00换水2/3以上,水源同上.经114d培育,小规格的北方须鳅全长达(7.49±0.70)cm,体质量(3.09±0.86)g,增长速度达0.02g/d,成活率95.2%;大规格北方须鳅全长达(8.50±0.63)cm,体质量(4.59±1.18)g,增长速度0.03g/d,成活率达67.5%,饲料系数达1.13.两种规格的全长(L)和体质量(W)的关系式分别为W=0.0057LT0831(R2=0.9273)和W=0.0058LT3.0533(R2=0.9136),属匀速增长型.结果表明,室内人工养殖北方须鳅完全可行.%A total of 30 thousand of fry loach Barbatula barbatula nuda were reared in three aquaria of each 100 cm × 50 cm × 45 cm supplied with deep well water exposed to the sun 48 h and aerated daily in a greenhouse at the same stock density,and fed self-restraint granulated diet at water temperature of 18°C in May of 2016.Then 2 thousand fingerlings with average total length of 5.30 ~6.04 cm and body weight of 1.10 ~ 1.38 g reared above were stocked into 4 round plastic barrels of each Φ 800 mm × 850 mm at a rate of 375 fish per barrel for the small-sized fingerlings and at a rate of 500 fish per barrel for the large-sized ones at daily water exchange rate of 2/3 of the total volume water and fed self-restraint granulated diet at 8:00 and 18:00 at feeding rate of some 3% twice a day at water temperature of 16 ~ 19 °C for 114 d.It was found that the small-sized fingerlings had final total length of (7.49 ± 0.70)cm,final body weight of (3.09 ± 0.86) g,with weight gain rate of 0.02 g/d and survival rate of 95.2%,while the large-sized fingerlings had final total length of (8.50 ± 0.63) cm,final body weight of (4.59± 1.18) g,with weight gain rate of 0.03 g/d and survival rate of 67.5%.There was food conversion ratio of 1.13 during the culture period for both sized loach juveniles.The linear relationship between body weight (W) and total length (L) was expressed as Wsmdll=0.0057LT3.0831 (R2 =0.9273) for the small-sized fingerlings and Wlarger=0.005 8LT3.0533 (R2 =0.9136) for the large-sized fingerlings,with power of near 3,showing uniform growth.Thus,it is feasible for Barbatula barbatula nuda culture in an indoor tank.