Ectoparasite Prevalences of Grouper Fish (Epinephelus fuscogutatus x Epinephelus polyphekadion) Cultured in Floating Net Cages

S. Adibrata, M. Yusuf, Cristiana Manullang
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引用次数: 1

Abstract

Monitoring the health of the reared fish in a floating net cage (FNC) is often conducted by examining their ectoparasites. Th is study determine s ectoparasite prevalence s of grouper fish (Epinephelus fuscogutatus x E. polyphekadion ). It was conducted in the waters surrounding Pongok Island, South Bangka Regency. The health examination of both fish and ectoparasites w as carried out by apply ing simple random sampling during three periods, November 2016 (I), February 2017 (II) and May 2017 (III) . H ydro-oceanography surve ys were done every month during th e th ree year s . The grouper checking s (I, II and III) indicated the prevalences of ectoparasites in these periods were 43.3%, 8.8% and 13.5%, respectively. Fish death highly occurred in the period I , and the grouper surviv al rate at harvesting time was only 70% from initial seed stocking of 1 , 500 fish. T he ectoparasite intensit ies during the research periods we re 1.6, 1.6 and 1.5, respectively. This condition implies that every 10 grouper s would potentially be attacked by at least 15-16 ectoparasites. A slow seawater current flow trigger ed the quick uplifting of the ectoparasites from the seafloor. The water condition at the FNC location in 2011 and 201 7 was still under the quality standard. Th e ectoparasites were coming from the surrounding environment of the FNC location . I t is inevitable that the fish culture management should focus on cleansing the ectoparasites attaching on the groupers, dusting the net cage clean, and arranging the harvest pattern on a particular month following the surrounding environmental condition to prevent ectoparasite attacks .
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浮式网箱养殖石斑鱼(褐斑石斑鱼和多斑石斑鱼)的体外寄生虫流行率
监测在浮动网箱(FNC)中饲养的鱼的健康状况通常是通过检查其体外寄生虫来进行的。本研究测定了石斑鱼(Epinephelus fuscogutatus x E. polyhekadia)体表寄生虫的流行情况。这是在南Bangka摄政Pongok岛周围的水域进行的。在2016年11月(I)、2017年2月(II)和2017年5月(III)三个时间段,采用简单随机抽样的方法对鱼类和体外寄生虫进行健康检查。3年期间每月进行水文海洋调查。石斑鱼检查(ⅰ、ⅱ、ⅲ)显示,各时间段外寄生虫的患病率分别为43.3%、8.8%和13.5%。第1期鱼类死亡发生率高,采鱼期1500尾石斑鱼的成活率仅为70%。研究期间的外寄生强度分别为1.6、1.6和1.5。这种情况意味着每10条石斑鱼就有可能受到至少15-16条体外寄生虫的攻击。缓慢的海水流动触发了体外寄生虫从海底迅速上升。FNC厂址2011年和2017年水质均未达标。体外寄生虫主要来源于FNC位置周围环境。因此,养殖管理的重点是清除附着在石斑鱼身上的外寄生虫,清扫网箱,并根据周围环境情况安排特定月份的捕捞模式,以防止外寄生虫的侵袭。
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