The present invention relates to an aquaculturing system for producing cultured fish by using a marine fish feed source, where said marine fish feed source is obtained according to a method for producing a marine fish feed source comprising copepods, and where said fish larvae are fed with said marine fish feed source, obtained according to a method for feeding fish larvae with a marine fish feed source, where said system comprises a number of containers comprising said fish larvae and the water in each of said containers is filtered by leading water from said container through a bio-filter system and by returning the filtered water to one or more of said containers, whereby the containers are supplied with new non-pathogen bacteria, and whereby toxic ammonia products are removed from containers, and wherein said copepods are used as fish feed in a specific fish larvae container so as to ensure that said fish larvae in said specific fish larvae container are fed with copepods having reached a life stage and/or size which is suitable for feeding said specific fish larvae.
