Life history, distribution and seasonal movements of a threatened South African endemic seabream, Chrysoblephus gibbiceps

The red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth, reproduction and diet. In addition, catch records from...

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Veröffentlicht in:African journal of marine science Jg. 41; H. 4; S. 395 - 411
Hauptverfasser: Attwood, CG, Dawson, ME, Kerwath, SE, Wilke, C
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Grahamstown Taylor & Francis 17.12.2019
Taylor & Francis Ltd
Schlagworte:
Age
Agulhas Bank
body length
body weight
Carabodes gibbiceps
Catch per unit effort
catch records
Chrysoblephus gibbiceps
Courtship
Depletion
Diet
Distribution
Distribution patterns
endangered species
Endemic species
feeds
females
Fishing
Fishing effort
Fishing pressure
Gonadosomatic index
Growth
growth models
Indian Ocean
indigenous species
Length-weight relationships
Life history
longevity
Males
Marine fishes
migratory behavior
Morphology
morphometrics
Nutrient deficiency
Nutrition
otoliths
overfishing
Polygamy
Prey
Protogyny
red stumpnose
reefs
Reproductive behaviour
Seasonal distribution
Secondary sexual characters
Sediments
Sex ratio
Sexual behavior
Shoaling
South Africa
Sparidae
Spawning
Spawning seasons
summer
Sympatric populations
sympatry
threatened species
Trophic levels
Indian Ocean
South Africa
ISSN:1814-232X, 1814-2338, 1814-2338
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Abstract The red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth, reproduction and diet. In addition, catch records from three time-periods since 1897 were interrogated for distribution patterns and movement behaviour. The sex ratio was 1.5:1 in favour of males. The length-weight relationship, W = 9.32 × 10 −5 L F 2.811 , indicates hypoallometric growth. The bulbous head of large males is a secondary sexual characteristic. A von Bertalanffy growth model was fitted to age data obtained using otolith analyses: L F = 429.9 × (1 - e −0.113(t - (−3.799) ). The maximum recorded age was 48 years, which is among the highest in seabreams, though the species matures after only 3 years. The gonadosomatic index (GSI) of ripe females (4.5%) was comparatively low, and the two-month-long early-summer spawning season was short compared with that of other sympatric seabreams. The very low GSI of ripe males (1.6%) suggests courtship battles and polygamy. The species feeds over low-profile reefs and consolidated sediments. The principal prey are ophiuroids. Although its trophic level is 3.7, C. gibbiceps has a low-nutrition diet. Historical and current catch data confirm a distribution from Cape Point (southeastern Atlantic) to southern KwaZulu-Natal Province (western Indian Ocean). There is evidence for localised migratory patterns, now partly lost due to severe population depletion. Whereas protogyny and resident behaviour have been suggested as traits that render seabreams vulnerable to fishing pressure, C. gibbiceps is a shoaling gonochorist that has collapsed due to fishing.
AbstractList The red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth, reproduction and diet. In addition, catch records from three time-periods since 1897 were interrogated for distribution patterns and movement behaviour. The sex ratio was 1.5:1 in favour of males. The length-weight relationship, W = 9.32 × 10 −5 L F 2.811 , indicates hypoallometric growth. The bulbous head of large males is a secondary sexual characteristic. A von Bertalanffy growth model was fitted to age data obtained using otolith analyses: L F = 429.9 × (1 - e −0.113(t - (−3.799) ). The maximum recorded age was 48 years, which is among the highest in seabreams, though the species matures after only 3 years. The gonadosomatic index (GSI) of ripe females (4.5%) was comparatively low, and the two-month-long early-summer spawning season was short compared with that of other sympatric seabreams. The very low GSI of ripe males (1.6%) suggests courtship battles and polygamy. The species feeds over low-profile reefs and consolidated sediments. The principal prey are ophiuroids. Although its trophic level is 3.7, C. gibbiceps has a low-nutrition diet. Historical and current catch data confirm a distribution from Cape Point (southeastern Atlantic) to southern KwaZulu-Natal Province (western Indian Ocean). There is evidence for localised migratory patterns, now partly lost due to severe population depletion. Whereas protogyny and resident behaviour have been suggested as traits that render seabreams vulnerable to fishing pressure, C. gibbiceps is a shoaling gonochorist that has collapsed due to fishing.
The red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth, reproduction and diet. In addition, catch records from three time-periods since 1897 were interrogated for distribution patterns and movement behaviour. The sex ratio was 1.5:1 in favour of males. The length–weight relationship, W = 9.32 × 10⁻⁵ LF².⁸¹¹, indicates hypoallometric growth. The bulbous head of large males is a secondary sexual characteristic. A von Bertalanffy growth model was fitted to age data obtained using otolith analyses: LF = 429.9 × (1 – e⁻⁰.¹¹³⁽ᵗ – ⁽⁻³.⁷⁹⁹⁾). The maximum recorded age was 48 years, which is among the highest in seabreams, though the species matures after only 3 years. The gonadosomatic index (GSI) of ripe females (4.5%) was comparatively low, and the two-month-long early-summer spawning season was short compared with that of other sympatric seabreams. The very low GSI of ripe males (1.6%) suggests courtship battles and polygamy. The species feeds over low-profile reefs and consolidated sediments. The principal prey are ophiuroids. Although its trophic level is 3.7, C. gibbiceps has a low-nutrition diet. Historical and current catch data confirm a distribution from Cape Point (southeastern Atlantic) to southern KwaZulu-Natal Province (western Indian Ocean). There is evidence for localised migratory patterns, now partly lost due to severe population depletion. Whereas protogyny and resident behaviour have been suggested as traits that render seabreams vulnerable to fishing pressure, C. gibbiceps is a shoaling gonochorist that has collapsed due to fishing.
The red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth, reproduction and diet. In addition, catch records from three time-periods since 1897 were interrogated for distribution patterns and movement behaviour. The sex ratio was 1.5:1 in favour of males. The length-weight relationship, W = 9.32 × 10-5 LF2.811, indicates hypoallometric growth. The bulbous head of large males is a secondary sexual characteristic. A von Bertalanffy growth model was fitted to age data obtained using otolith analyses: LF = 429.9 × (1 - e-0.113(t - (-3.799)). The maximum recorded age was 48 years, which is among the highest in seabreams, though the species matures after only 3 years. The gonadosomatic index (GSI) of ripe females (4.5%) was comparatively low, and the two-month-long early-summer spawning season was short compared with that of other sympatric seabreams. The very low GSI of ripe males (1.6%) suggests courtship battles and polygamy. The species feeds over low-profile reefs and consolidated sediments. The principal prey are ophiuroids. Although its trophic level is 3.7, C. gibbiceps has a low-nutrition diet. Historical and current catch data confirm a distribution from Cape Point (southeastern Atlantic) to southern KwaZulu-Natal Province (western Indian Ocean). There is evidence for localised migratory patterns, now partly lost due to severe population depletion. Whereas protogyny and resident behaviour have been suggested as traits that render seabreams vulnerable to fishing pressure, C. gibbiceps is a shoaling gonochorist that has collapsed due to fishing.
Author Dawson, ME
Wilke, C
Attwood, CG
Kerwath, SE
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  start-page: 47
  year: 1997
  ident: CIT0041
  publication-title: Fishery Bulletin
– ident: CIT0003
  doi: 10.1093/icesjms/fsr162
– ident: CIT0006
  doi: 10.1139/f81-132
– ident: CIT0055
  doi: 10.2989/1814232X.2014.951393
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Snippet The red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C....
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SubjectTerms Age
Agulhas Bank
body length
body weight
Carabodes gibbiceps
Catch per unit effort
catch records
Chrysoblephus gibbiceps
Courtship
Depletion
Diet
Distribution
Distribution patterns
endangered species
Endemic species
feeds
females
Fishing
Fishing effort
Fishing pressure
Gonadosomatic index
Growth
growth models
Indian Ocean
indigenous species
Length-weight relationships
Life history
longevity
Males
Marine fishes
migratory behavior
Morphology
morphometrics
Nutrient deficiency
Nutrition
otoliths
overfishing
Polygamy
Prey
Protogyny
red stumpnose
reefs
Reproductive behaviour
Seasonal distribution
Secondary sexual characters
Sediments
Sex ratio
Sexual behavior
Shoaling
South Africa
Sparidae
Spawning
Spawning seasons
summer
Sympatric populations
sympatry
threatened species
Trophic levels
Title Life history, distribution and seasonal movements of a threatened South African endemic seabream, Chrysoblephus gibbiceps
URI https://www.tandfonline.com/doi/abs/10.2989/1814232X.2019.1686423
https://www.proquest.com/docview/2328366087
https://www.proquest.com/docview/2440686282
Volume 41
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