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Effects of Stocking Density on Growth,Survival,Production,and Size Variation of the Common Carp Cyprinus Carpio Linnaeus(1758)Fry Within Aquariums
魚缸放養密度對鯉Cyprinus Carpio Linnaeus(1758)魚苗成長、存活、生產量及體型差異之影響
摘要
鰻魚為東亞地區重要的養殖魚種之一，主要養殖國家為臺灣、中國及日本，這三國的鰻魚產量佔全球鰻魚總產量的90％左右。由於鰻魚的人工繁殖技術尚未被確立，因此養殖所需的鰻苗均皆仰賴天然撈捕者。受到天然環境的影響，鰻線的捕獲量年年變動，鰻苗售價的大幅波動，增加產業發展的不穩定性。有鑑於此，有關學者專家莫不努力研發，期待早日確立鰻苗生產技術。由於鰻魚費用在鰻魚生產成本中約佔30～60％之比例，因此鰻魚人工繁殖技術被確立後，究竟對三國間競爭優勢有何影響，一直深受關注。本研究乃利用DRC(Domestic Resource Cost)作為指標模擬分析三國在鰻苗人工繁殖成功後之競爭力，結果發現臺灣、日本及中國中任何一個國家，優先取得人工繁殖技術者，則能大幅提高該國鰻魚產業的競爭力。本文針對分析結果提出幾點建議俾供參考。
並列摘要
Eel is one of the most important aquaculture species in Asia.Taiwan,Japan,andChina are the leading eel-producing countries,contributing to about 90% of the world eelaquaculture production.Since the technology on larval rearing has not yet beenestablished,the glass eel supply is entirely dependent on natural harvest,which limits thescale and area of eel aquaculture.Such dependence results in the fluctuation of seedprices and the instability of the industry's development.Since the seed expensecontributes to 30%-60% of the eel production cost,it is believed that the commercializationof larval rearing technology will be able to abate the eel production cost,and therefore,elevate the competitiveness of eel aquaculture.The Domestic Resource Cost(DRC)index was used in this research to analyze the impact of successful propagation on thecompetitiveness of the eel aquaculture in Taiwan,Japan,and China.Our results suggestthat the first country to successfully achieve the technique in larval rearing would berewarded with the most profit.This paper also provides some suggestions to improve thecompetitiveness of the eel aquaculture in Taiwan,Japan,and China.