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Onset and development of aggressive behavior in the early life stages of the seven-band grouper Epinephelus septemfasciatus

机译:七带石斑鱼Epinephelus septemfasciatus早期生活阶段攻击行为的发生和发展

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摘要

Onset and development of aggressive behavior were observed in the early life stages of seven-band grouper Epinephelus septemfasciatus. Fish culture was divided into two terms: the first term, from hatch until 21 days after hatching (DAH); and the second term, from 21 DAH until settlement (65 DAH). During the second term the effect of different aeration rate on survival was investigated. Survival during the first term was 14.1 ± 7.1%. In the second term, survival in control tanks (aeration rate 200 mL/min) was 14.7 ± 10.2% and 18.8 ± 7.8% in the increasing aeration tanks (aeration rate 200-800 mL/min). Behavioral observations were conducted at about 8-day intervals and aggressive behavior was quantified by the frequency of chase behavior. Aggressive behavior was first observed on 52 DAH when pigment appeared on the dorsal area of the metamorphosing larvae (standard length 16.6 ± 6.0 mm). Aggressive behavior significantly increased from 59 DAH coinciding with the beginning of settlement.
机译:在七波段石斑鱼石斑鱼的早期阶段观察到攻击行为的发生和发展。鱼类养殖分为两个术语:第一个术语,从孵化到孵化后21天(DAH);第二个学期,从21 DAH到结算(65 DAH)。在第二学期中,研究了不同通气率对存活率的影响。第一个学期的生存率为14.1±7.1%。在第二个学期中,控制罐(充气速率200 mL / min)的存活率是14.7±10.2%,而增加的充气罐(充气速率200-800 mL / min)的存活率是18.8±7.8%。大约每隔8天进行一次行为观察,并通过追逐行为的频率来量化攻击行为。当色素出现在变态幼虫的背侧区域(标准长度16.6±6.0 mm)时,首先在52 DAH上观察到了侵略性行为。积极行为从59 DAH开始显着增加,与定居开始相吻合。

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