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Fish and decapod crustaceans associated with the seagrass Zostera capricorni Aschers. were sampled by beam trawling during the day, beam trawling at night and poisoning during the day. There were significant differences in the numbers of species and individuals sampled by each method. Beam trawling dur~ng the day captured 30 % fewer species of fish than did either night trawling or poisoning. However, day trawls caught 85 % fewer and night trawls caught 60 % fewer indiv~duals of fish than poisoning. Poisoning and day trawling, respectively, caught 46 and 40 % fewer species, and 82 and 48 % fewer individuals, of decapods than beam trawling at night. Consequently, species con~position of samples also differed between methods O u r data suggest that more serious consideration should be given to the rel~ability of d~fferent techn~ques for sampling the vagile macrofauna of seagrass meadows.

Consequences of two common techniques for sampling vagile macrofauna associated with the seagrass Zostera capricorni