Elsevier

Biological Conservation

Volume 78, Issue 3, December 1996, Pages 223-231
Biological Conservation

An evaluation of the suitability of non-specialist volunteer researchers for coral reef fish surveys. Mafia Island, Tanzania — A case study

https://doi.org/10.1016/0006-3207(95)00147-6Get rights and content

Abstract

Trials are described for testing and validating the use of non-specialist volunteer divers for visual censusing of reef fish populations. Volunteers showed significant improvement between two censuses in identifying 56 species in 30 genera. Thus, after 11 additional dives, the loss of precision compared with an experienced ‘control’ diver was reduced from 13% to 0·6%. In the second census there was no loss in consistency caused by the use of groups of divers rather than single divers. Even in the early stages of training the level of precision was sufficient to detect changes in composition at the trophic level.

Coloured canvas strips were used as model ‘fish’ for estimating lengths underwater. After three trials divers were able to estimate lengths with an 80% accuracy in relation to the true distribution.

References (35)

  • P.B. Adams

    Life history patterns in marine fishes and their consequences for fisheries management

    Fish. Bull. US Fish & Wildl.

    (1990)
  • J.D. Bell et al.

    Estimating length frequency distributions of large reef fish underwater

    Coral Reefs

    (1985)
  • V.E. Brock

    A method of estimating fish populations

    J. Wildl. Manage.

    (1954)
  • R.E. Brock

    A critique of the visual census technique for assessing coral reef fish populations

    Bull. Mar. Sci.

    (1982)
  • C.D. Buxton et al.

    Abundance and distribution patterns of three temperate marine reef fish (Teleostei: Sparidae) in exploited and unexploited areas off the southern cape coast

    J. Appl. Ecol.

    (1989)
  • L.M. Chou

    A reef conservation project involving sport divers in Singapore

  • EPA
  • A.J. Fowler

    The development of sampling strategies for population studies of coral reef fishes

    A case study

    Coral Reefs

    (1987)
  • L.E. Greene et al.

    Comparative accuracies of visual assessment methods for coral reef fishes

    Bull. Mar. Sci.

    (1989)
  • E.S. Hobson

    Trophic relations of fishes specialized to feed on zooplankters above coral reefs

  • J.C. Horrill et al.

    Mafia Island Project Report No. 2: results of the physical, biological and resource use surveys: rationale for the development of a management strategy

    (1991)
  • J.C. Horrill et al.

    Development of a proposed Marine Protected Area at Mafia Island, Tanzania

    Ambio

    (1996)
  • A. Keast et al.

    Strip counts as a means of determining densities and habitat utilization patterns in lake fishes

    Environ. Biol. Fish.

    (1977)
  • J.J. Kimmel

    A new species-time method for visual assessment of fishes and its comparison with established methods

    Environ. Biol. Fish.

    (1985)
  • M.P. Lincoln Smith

    Effects of observer swimming speed on sample counts of temperate rocky reef fish assemblages

    Mar. Ecol. Prog. Ser.

    (1988)
  • R.H. Lowe-McConnell

    Ecological studies in tropical fish communities

    (1987)
  • M.I. McCormick et al.

    Estimating total abundance of a large temperate-reef fish using visual striptransects

    Mar. Biol.

    (1987)

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