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PhD student, the Hong Kong University of Science and Technology


study the nutritional requirement of larval fish

Successful rearing of marine larval fish has long become the bottleneck of marine fish aquaculture. Despite of considerable progresses in recent years, many questions still remained for larval fish nutritional requirements. The overall study provided a full picture of essential micro-elemental nutrition in the early life stage of marine fish. Fish at the early life stage tend to have high micro-elemental requirements, and the requirement changed dynamically with their growth. By using a modified fractional model, we successfully quantified Zn and Fe requirement in a model organism marine medaka. However, responses to different micro-elemental supplementary levels were elemental independent, with both fragile (low Zn) and resistant (low Fe) responses observed. Combined with elemental stoichiometry, sufficiency of each micro-element in typical live feeds (rotifer, artemia and copepod) to marine fish larvae was evaluated, with rotifer potentially deficient in Zn and Se. This can be solved by short-time or long-time Zn and Se enrichment in rotifer. However, the residue time of rotifer during real application should be minimized due to the rapid loss of these enriched micro-elements. Furthermore, zinc oxide nanoparticle presented as a potential novel micro-element source due to its high bioavailability and low toxicity to stomach-less fish, which can be adopted in future micro-feed production.