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New Zealand Journal of Marine and Freshwater Research abstractsPOPULATION AND STANDING CROP ESTIMATES FOR ROCKY REEF FISHES OF NORTH-EASTERN NEW ZEALANDB. C. Russell*Marine Research Laboratory, University of Auckland, R. D. Leigh, New ZealandAbstract Estimates of the population and standing cron of fishes were made in six selected transect areas around Goat Island (17*4° 47'50" E, 36° 16'10" S), a typical rocky reef area on the coast of north-eastern New Zealand. There were considerable differences in the numbers of species and individuals between the sampling areas. Chance encounters with schools of "transient" fishes was a major source of variation between, replicate censuses. Amongst the "resident" species, variation in numbers could be attributed to habitat differences. Bottom topography and algal cover are important factors affecting the distribution and abundance of reef fishes. Standing crop estimates of resident fishes ranged from <0.001 kg.nr~2 (low relief bottom, sparse algal cover) to 0.103 kg.trr2 (high relief bottom, extensive algal cover). These figures are similar to those obtained for Californian kelp beds and. for coral reefs. Reef fish .populations are susceptible to exploitation and the scarcity of larger fishes in two of the study areas could be attributed to spearfishing. Resident species are most vulnerable to spearfishing, and legal protection for these fishes is suggested.
N.Z. Journal of Marine and Freshwater Research 11 (1) : 23-36. March 1977
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