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


报告题目:Cannibalism control in Asian seabass Lates calcarifer

报告人:秦建光 弗林德斯大学

主持人:陈立侨 教授

报告时间:2020年1月10日 上午10:00(周五上午)

报告地点:生科院534小会议室


报告人简介:

秦建光在大连水产学院获学士、美国俄克拉荷马(Oklahoma)大学获硕士、美国俄亥俄(Ohio)州立大学获博士学位、在美国夏威夷(Hawaii)大学完成博士后研究。 曾在大连水产学院、俄克拉荷马大学和俄亥俄州立大学任助教、费林德斯大学任讲师、高级讲师和副教授。现任费林德斯大学终身教授和水产养殖学科主任。20多年来,他始终主导着该大学在水产养殖和渔业科学领域的研究和发展,学术上一直保持着世界先进水平,在美国和澳大利亚等国家获18项荣誉和奖项。在国际知名出版社出版著作2本,参编学术专著14本, 在国际学术期刊发表250多篇SCI论文。著作被引用4800多次、被阅读54000多次、h-index为36.  其研究领域包括水产养殖学、水生动物饲料与营养学、 水生生物生态、生理及毒理学、行为学。 研究对象包括细菌、藻类、浮游动物、鱼类、贝类及甲壳类。目前任水产养殖杂志(Aquaculture)编辑,水产营养杂志(Aquaculture Nutrition)编辑、水产研究杂志(Aquaculture Research)编委。现任华东师范大学顾问教授、大连海洋大学客座教授、青岛农业大学客座教授。


报告内容:

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.