Comparison between the growth rate of the calanoid copepod Acartia tonsa when fed with fresh Isochrysis galbana algae and algae paste

Elijah Osarumen Aighobahi, Ioanna Kaklamanou, Monika Tsotsorou & Kennie Lind Rothmann

Studenteropgave: Basisprojekt

Abstrakt

Since aquaculture is one of the fastest growing food industries in the world, there is a demand for optimization of the procedures and methods used in it. One of the main problems that the aquaculture industry faces is the supply of nutritious live feed for fish larvae. The most commonly used feeds are rotifers, which can be cultured with relative ease, and Artemia brine shrimp cysts, which are bought as a ready feed. However, there are problems with these feeds due to their inadequate nutritional value. They do not facilitate high survival or growth rates, and they lower the nutritional value of the cultured fish. Here, the focus is an alternative feed for fish larvae – copepods. Being the natural food for fish larvae in the wild, it is a better choice in many aspects than the other feeds. However, copepods are more difficult to culture and therefore more expensive to use. This report covers an experiment to test the viability of a low cost concentrated paste as an alternative feed for copepods, leading to a lower cost for rearing copepods, making them more viable as a feed for fish larvae. The experiment was conducted on the copepod species Acartia tonsa, which was fed with Isochrysis galbana paste and a control group fed with fresh Isochrysis galbana. It was shown that the specific growth rate of the copepods fed with the paste was only 0.04 ng C per day while the copepods fed with fresh algae had a specific growth rate of 0.19 ng C per day. However, the mortality rates for the two treatments were not significantly different for the 17 days from hatching to termination. This shows that copepods that are solely fed with algae paste could have a use in aquaculture, since the fish larvae feed on copepods in their naupliar stages.

UddannelserBasis - International Naturvidenskabelig Bacheloruddannelse, (Bachelor uddannelse) Bachelor
SprogEngelsk
Udgivelsesdato27 maj 2016
Antal sider37
VejledereThomas Allan Rayner