鸭脖 亚博

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  • 1月10日 秦建光:Cannibalism control in Asian seabass Lates calcarifer


    報告題目:Cannibalism control in Asian seabass Lates calcarifer

    報告人:秦建光 弗林德斯大學

    主持人:陳立僑 教授

    報告時間:2020年1月10日 上午10:00(周五上午)

    報告地點:生科院534小會議室


    報告人簡介:

    秦建光在大連水產學院獲學士、美國俄克拉荷馬(Oklahoma)大學獲碩士、美國俄亥俄(Ohio)州立大學獲博士學位、在美國夏威夷(Hawaii)大學完成博士后研究。 曾在大連水產學院、俄克拉荷馬大學和俄亥俄州立大學任助教、費林德斯大學任講師、高級講師和副教授?,F任費林德斯大學終身教授和水產養殖學科主任。20多年來,他始終主導著該大學在水產養殖和漁業科學領域的研究和發展,學術上一直保持著世界先進水平,在美國和澳大利亞等國家獲18項榮譽和獎項。在國際知名出版社出版著作2本,參編學術專著14本, 在國際學術期刊發表250多篇SCI論文。著作被引用4800多次、被閱讀54000多次、h-index為36.  其研究領域包括水產養殖學、水生動物飼料與營養學、 水生生物生態、生理及毒理學、行為學。 研究對象包括細菌、藻類、浮游動物、魚類、貝類及甲殼類。目前任水產養殖雜志(Aquaculture)編輯,水產營養雜志(Aquaculture Nutrition)編輯、水產研究雜志(Aquaculture Research)編委?,F任華東師范大學顧問教授、大連海洋大學客座教授、青島農業大學客座教授。


    報告內容:

    Intracohort cannibalism is a common event in the culture of carnivorous fish in the early life stage. Cannibalism can lead to substantial fish mortalities and cause a great economic loss. The current practice to control cannibalism in aquaculture is by size grading, but the efficiency of size-grading is highly dependent on the size difference of large and small individuals. Previous studies have used morphological models to predict the maximum prey size that a cannibal can ingest. However, cannibalistic polyphenism has never been considered into a model to predict size-dependent cannibalism in fish. Furthermore, few models have been validated with an independent dataset. The aim of this study was to test size-dependent cannibalism in a highly cannibalistic fish, the Asian seabass Lates calcarifer. We hypothesized that a given sized cannibal can swallow a prey if the prey body depth is equal to or smaller than the cannibal mouth width. Furthermore, this study tested the role of cannibalistic polyphenism in predictive models that were developed using morphological traits from prey and cannibals. The predictive models were validated with the data from independent trials where cannibals were challenged with progressing increments of prey sizes. Mouth size showed negative allometric growth comparing with body depth, resulting in a descending trend on the maximum size of ingestible prey as cannibals grow larger. In the validation test, all predictive models underestimate the maximum ingestible prey size for cannibals. However, the model based on the maximal width of opened mouth closely matched the empirical observations. Moreover, the observed data showed that an experienced cannibal would have a greater ability to stretch its mouth size to catch a much larger prey than the models could predict. These results indicate the presence of cannibalistic polyphenism in barramundi. Asian seabass can ingest conspecific prey up to 78-72% of its body length, depending on their previous cannibalistic experience.


    鸭脖 亚博
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