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Angling Experiments With Carp (Cyprinus Carpio L.)

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Angling in drainable ponds for tagged carp, which were reared at a hatchery, revealed the following phenomena: 1. When densities were kept constant by returning captured carp to the same ponds, catches per unit angling effort decreased to low levels within less than 100 man-hours per acre. 2. Relatively high proportions of the carp present were caught only once (as concluded from comparison to Poisson probabilities). 3. Numbers of carp recaptured were significantly below numbers to be expected if catchability were unchanged after first capture. 4. When high proportions of the fished carp were hooked and subsequently lost, the whole populations fished for (not only the captured parts) became nearly uncatchable. 5. Catchability of carp one year after being either captured or hooked and lost was some three times lower than catchability of carp either never fished before or fished one year before, but not hooked. 6. The phenomena are considered as an example of one-trial learning: one hooking experience in an individual carp decreases its further willingness to take a bait upon a hook for a year at least.

Affiliations: 1: Organization for the Improvement of Inland Fisheries, Utrecht & Zoological Laboratory, State University of Groningen, The Netherlands

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