摘要
本文研究了不同强化饵料对匙吻鲟(Polyodon spathala)仔鱼生长和发育的影响,实验采用蛋黄或鱼油强化卤虫无节幼体或桡足幼体为饵料的共6个实验组,即未强化卤虫组、蛋黄强化卤虫组、鱼油强化卤虫组和未强化桡足幼体组、蛋黄强化桡足幼体组、鱼油强化桡足幼体组,对匙吻鲟仔鱼开口驯化14 d,动态监测和统计不同饵料组匙吻鲟仔鱼的生长和存活情况,并对消化酶活性进行相关性分析。体重、体长、日增重和存活率4个指标,均为桡足幼体组显著高于卤虫组(P<0.05),尤其在存活率方面,鱼油强化卤虫组不足50%,而未强化桡足幼体组最高可达86.59%;不同饵料组生长模式方程都获得较好的拟合,从体重和体长生长曲线看,桡足幼体组从饲喂8天起体长和体重进入快速生长期,而卤虫组生长一直相对缓慢;胃蛋白酶活性在未强化桡足幼体组显著高于其他组(P<0.05),不同饵料组对仔鱼的淀粉酶活性无显著性影响。结果表明,在匙吻鲟仔鱼开口期以桡足幼体开口饵料驯化效果较好,特别是未强化桡足幼体组仔鱼的存活率高,鱼油强化桡足幼体组仔鱼生长速度较快,而以卤虫饲喂效果相对较差。
In intensive aquaculture, the choice of diet in initial feeding stage has important effects on growth and survival in fish larvae, even all the whole life history. The aim of this study was to find out a diet more suitable for development and survival of paddlefish Polyodon spathala larvae in their initial feeding stage. A total of six different diet groups, namely, unenriched artemia nauplii, enriched artemia nauplii with yolk, enriched artemia nauplii with fish oil, unenriched copepodid larva, enriched copepodid larva with yolk and enriched copepodid larva with fish oil, were fed to paddlefish larvae in initial feeding for 14 days. The growth and survival of paddlefish larvae were monitored and recorded, the effects of six different diet groups on digestive enzymes activity were analyzed. The results indicated that all four statistical index, such as final weight, final length, daily weight gain(DWG) and survival rate(SR), were significantly higher in the three groups fed with copepodid larva than other three groups fed with artemia nauplii(P〈0.05, Table 1). Impressively, SR was less than 50% in fish larvae fed by enriched artemia nauplii with fish oil group, however, SR was over 86% in larvae fish fed by unenriched copepodid larva group(Table 1). Though growth pattern equations of six diet groups all fitted well, the weight and length growth curves revealed paddlefish larvae grew quickly after 8 d fed by diet of copepodid larva groups, while paddlefish larvae feed on diet of three artemia nauplii groups grew significantly slowly(Fig. 1﹣3). Pepsin activity in paddlefish larvae fed by unenriched copepodid larva group was higher than other five groups(P〈0.05, Fig. 4). In addition, the effects of six diets on amylase activity were not significantly different(P〈0.05, Fig. 6). Collectively, paddlefish larvae fed with unenriched copepodid larva group had significantly high survival rate, and that of enriched copepodid larva with yolk group grew quickly. Therefore, these results suggested copepodid larva diet is much better choice than artemia nauplii diet for paddlefish larvae during initial feeding stage.
出处
《动物学杂志》
CAS
CSCD
北大核心
2015年第4期571-580,共10页
Chinese Journal of Zoology
基金
广东省科学院野外台站基金项目(No.Sytz201203)
基本科研业务费专项资金项目(No.HYS201202)
公益性行业(农业)科研专项(No.201003055)
关键词
匙吻鲟
不同饵料
开口驯化
消化酶
Paddlefish Polyodon spathala
Different diets
Initial feeding stage
Digestive enzyme