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The ability to find food is one of the most important behaviours an animal can undertake, and one of the best advantages an animal can have is to remember where food can commonly be found. Laboratory studies have shown that fish are able to use learning-based strategies to locate food with most studies focusing on the aquatic equivalent of the lab rat - the goldfish. This fish has been shown to typically use visual landmarks to remember a food source within laboratory arenas. In this study the authors used radio tagged common carp to investigate the ability of free ranging fish to undertake similar behaviours. Carp are very closely related to goldfish and share similar feeding habits and sensory cues while feeding. This was undertaken in a highly turbid lake with a water clarity of <>
This study showed that carp could quickly learn and find the location of a food reward in the natural environment. It typically took the carp six days to learn and remember where the food reward was. This matches that found in laboratory trials. Carp were highly nocturnal in their feeding habits and would leave their home range during the night consistently visiting the food reward once the location was known.
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This study has some big implications. Firstly, carp are known to undergo extensive movements of 100 km or more. They will often enter areas to spawn that are unstable but predator free, and the ability to remember such locations would significantly improve the survival of their offspring. The ability to remember important sites would therefore be highly adaptive. Another implication is to use this knowledge to reduce the numbers of this fish, which is one of the most invasive species worldwide. By setting up feeding stations you may be able to attract many carp to a specific location within a short time frame and then undertake selective removal.
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