Population estimates and size structure of Plectropomus leopardus (Pisces: Serranidae) in relation to no-fishing zones: Mark-release-resighting and underwater visual census

D. C. Zeller, G. R. Russ

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21 Citations (Scopus)

Abstract

A mark-release resighting (MRR) technique was used to estimate population size of the coral trout, Plectropomus leopardus, on coral reefs fringing Lizard Island, Great Barrier Reef, Australia. Fish were captured by hook-and-line fishing, and marked with individual freeze-brand numbers in August 1995. An underwater visual census (UVC) technique was used during September and October 1995 both for resighting of marked fish and to make an independent estimate of fish density and thus population size. The study area was 750 966 m2. The UVC sampled 154 000 m2 (20.5%) of this area. Six different methods of analysis of MRR gave similar population size estimates (e.g. Petersen 12 873; 95% CI 9989-15 754) extrapolated to the 4.5 million-m2 reef area from datum to 20-m depth around Lizard Island. UVC gave a population size estimate (24 182; 95% CI 21 860-26 504) twice that of MRR. The lower estimate derived from MRR may be the result of tag-induced mortality, or of the relative difficulty in discriminating between marked and unmarked trout by UVC. This is only the second estimate of population size of coral trout on an area of the Great Barrier Reef.

Original languageEnglish
Pages (from-to)221-228
Number of pages8
JournalMarine and Freshwater Research
Volume51
Issue number3
Publication statusPublished - 2000
Externally publishedYes

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Bass
Serranidae
Censuses
size structure
Pisces
Population Density
population structure
population size
census
fishing
Trout
Anthozoa
Fishes
Lizards
Great Barrier Reef
barrier reef
Islands
lizard
coral
fish

Cite this

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title = "Population estimates and size structure of Plectropomus leopardus (Pisces: Serranidae) in relation to no-fishing zones: Mark-release-resighting and underwater visual census",
abstract = "A mark-release resighting (MRR) technique was used to estimate population size of the coral trout, Plectropomus leopardus, on coral reefs fringing Lizard Island, Great Barrier Reef, Australia. Fish were captured by hook-and-line fishing, and marked with individual freeze-brand numbers in August 1995. An underwater visual census (UVC) technique was used during September and October 1995 both for resighting of marked fish and to make an independent estimate of fish density and thus population size. The study area was 750 966 m2. The UVC sampled 154 000 m2 (20.5{\%}) of this area. Six different methods of analysis of MRR gave similar population size estimates (e.g. Petersen 12 873; 95{\%} CI 9989-15 754) extrapolated to the 4.5 million-m2 reef area from datum to 20-m depth around Lizard Island. UVC gave a population size estimate (24 182; 95{\%} CI 21 860-26 504) twice that of MRR. The lower estimate derived from MRR may be the result of tag-induced mortality, or of the relative difficulty in discriminating between marked and unmarked trout by UVC. This is only the second estimate of population size of coral trout on an area of the Great Barrier Reef.",
keywords = "Coral trout, Fisheries, Freeze brand, Marine protected areas, Mark-release recapture, Population size, Visual census",
author = "Zeller, {D. C.} and Russ, {G. R.}",
year = "2000",
language = "English",
volume = "51",
pages = "221--228",
journal = "Marine Freshwater Research",
issn = "0067-1940",
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TY - JOUR

T1 - Population estimates and size structure of Plectropomus leopardus (Pisces

T2 - Serranidae) in relation to no-fishing zones: Mark-release-resighting and underwater visual census

AU - Zeller, D. C.

AU - Russ, G. R.

PY - 2000

Y1 - 2000

N2 - A mark-release resighting (MRR) technique was used to estimate population size of the coral trout, Plectropomus leopardus, on coral reefs fringing Lizard Island, Great Barrier Reef, Australia. Fish were captured by hook-and-line fishing, and marked with individual freeze-brand numbers in August 1995. An underwater visual census (UVC) technique was used during September and October 1995 both for resighting of marked fish and to make an independent estimate of fish density and thus population size. The study area was 750 966 m2. The UVC sampled 154 000 m2 (20.5%) of this area. Six different methods of analysis of MRR gave similar population size estimates (e.g. Petersen 12 873; 95% CI 9989-15 754) extrapolated to the 4.5 million-m2 reef area from datum to 20-m depth around Lizard Island. UVC gave a population size estimate (24 182; 95% CI 21 860-26 504) twice that of MRR. The lower estimate derived from MRR may be the result of tag-induced mortality, or of the relative difficulty in discriminating between marked and unmarked trout by UVC. This is only the second estimate of population size of coral trout on an area of the Great Barrier Reef.

AB - A mark-release resighting (MRR) technique was used to estimate population size of the coral trout, Plectropomus leopardus, on coral reefs fringing Lizard Island, Great Barrier Reef, Australia. Fish were captured by hook-and-line fishing, and marked with individual freeze-brand numbers in August 1995. An underwater visual census (UVC) technique was used during September and October 1995 both for resighting of marked fish and to make an independent estimate of fish density and thus population size. The study area was 750 966 m2. The UVC sampled 154 000 m2 (20.5%) of this area. Six different methods of analysis of MRR gave similar population size estimates (e.g. Petersen 12 873; 95% CI 9989-15 754) extrapolated to the 4.5 million-m2 reef area from datum to 20-m depth around Lizard Island. UVC gave a population size estimate (24 182; 95% CI 21 860-26 504) twice that of MRR. The lower estimate derived from MRR may be the result of tag-induced mortality, or of the relative difficulty in discriminating between marked and unmarked trout by UVC. This is only the second estimate of population size of coral trout on an area of the Great Barrier Reef.

KW - Coral trout

KW - Fisheries

KW - Freeze brand

KW - Marine protected areas

KW - Mark-release recapture

KW - Population size

KW - Visual census

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