Age and growth of the banded guitarfish Zapteryx exasperata (Chondrichthyes: Trygonorrhinidae)

Fabián Cervantes-Gutiérrez, Javier Tovar-Ávila, Felipe Galván-Magaña

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

© CSIRO 2018. The banded guitarfish (Zapteryx exasperata) is the third most abundant ray species in the artisanal elasmobranch fishery of Baja California Sur, Mexico. However, there is no biological information about its age and growth parameters, limiting the application of some quantitative population assessment methods, such as demographic models. The aim of the present study was to estimate, for the first time, age and individual growth of Z. exasperata. Biometric data from 244 individuals and 236 vertebrae were analysed. The largest number of banded guitarfish in fishery landings was observed during April and August, with a female:male sex ratio of 1:1.8. The size range was 56.4-103-cm total length (TL) for females and 51.6-92cm TL for males, with females being significantly larger than males (P<0.05). The periodicity of the vertebral edge suggests that growth band pairs form annually. The estimated age structure was 5-22.6 years for females and 4-19.6 years for males, with significant differences between sexes (P<0.01). The goodness-of-fit of three models was evaluated. For the von Bertalanffy growth model, the parameters were as follows. For females: Theoretical maximum length, L∞ ≤ 100.71cm TL; growth coefficient, k ≤ 0.144year-1; and theoretical age at length zero, t0 ≤ -0.39years. For males: L∞ ≤ 89.78cm TL; k ≤ 0.174year-1; and t0 ≤ -0.65years.
Original languageAmerican English
Pages (from-to)66-73
Number of pages58
JournalMarine and Freshwater Research
DOIs
StatePublished - 1 Jan 2018
Externally publishedYes

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Chondrichthyes
Fisheries
artisanal fishery
artisanal fishing
biometry
assessment method
Biometrics
Landing
age structure
range size
sex ratio
periodicity
vertebrae
growth models
fishery
demographic statistics
Mexico
fisheries
gender

Cite this

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title = "Age and growth of the banded guitarfish Zapteryx exasperata (Chondrichthyes: Trygonorrhinidae)",
abstract = "{\circledC} CSIRO 2018. The banded guitarfish (Zapteryx exasperata) is the third most abundant ray species in the artisanal elasmobranch fishery of Baja California Sur, Mexico. However, there is no biological information about its age and growth parameters, limiting the application of some quantitative population assessment methods, such as demographic models. The aim of the present study was to estimate, for the first time, age and individual growth of Z. exasperata. Biometric data from 244 individuals and 236 vertebrae were analysed. The largest number of banded guitarfish in fishery landings was observed during April and August, with a female:male sex ratio of 1:1.8. The size range was 56.4-103-cm total length (TL) for females and 51.6-92cm TL for males, with females being significantly larger than males (P<0.05). The periodicity of the vertebral edge suggests that growth band pairs form annually. The estimated age structure was 5-22.6 years for females and 4-19.6 years for males, with significant differences between sexes (P<0.01). The goodness-of-fit of three models was evaluated. For the von Bertalanffy growth model, the parameters were as follows. For females: Theoretical maximum length, L∞ ≤ 100.71cm TL; growth coefficient, k ≤ 0.144year-1; and theoretical age at length zero, t0 ≤ -0.39years. For males: L∞ ≤ 89.78cm TL; k ≤ 0.174year-1; and t0 ≤ -0.65years.",
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Age and growth of the banded guitarfish Zapteryx exasperata (Chondrichthyes: Trygonorrhinidae). / Cervantes-Gutiérrez, Fabián; Tovar-Ávila, Javier; Galván-Magaña, Felipe.

In: Marine and Freshwater Research, 01.01.2018, p. 66-73.

Research output: Contribution to journalArticle

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T1 - Age and growth of the banded guitarfish Zapteryx exasperata (Chondrichthyes: Trygonorrhinidae)

AU - Cervantes-Gutiérrez, Fabián

AU - Tovar-Ávila, Javier

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N2 - © CSIRO 2018. The banded guitarfish (Zapteryx exasperata) is the third most abundant ray species in the artisanal elasmobranch fishery of Baja California Sur, Mexico. However, there is no biological information about its age and growth parameters, limiting the application of some quantitative population assessment methods, such as demographic models. The aim of the present study was to estimate, for the first time, age and individual growth of Z. exasperata. Biometric data from 244 individuals and 236 vertebrae were analysed. The largest number of banded guitarfish in fishery landings was observed during April and August, with a female:male sex ratio of 1:1.8. The size range was 56.4-103-cm total length (TL) for females and 51.6-92cm TL for males, with females being significantly larger than males (P<0.05). The periodicity of the vertebral edge suggests that growth band pairs form annually. The estimated age structure was 5-22.6 years for females and 4-19.6 years for males, with significant differences between sexes (P<0.01). The goodness-of-fit of three models was evaluated. For the von Bertalanffy growth model, the parameters were as follows. For females: Theoretical maximum length, L∞ ≤ 100.71cm TL; growth coefficient, k ≤ 0.144year-1; and theoretical age at length zero, t0 ≤ -0.39years. For males: L∞ ≤ 89.78cm TL; k ≤ 0.174year-1; and t0 ≤ -0.65years.

AB - © CSIRO 2018. The banded guitarfish (Zapteryx exasperata) is the third most abundant ray species in the artisanal elasmobranch fishery of Baja California Sur, Mexico. However, there is no biological information about its age and growth parameters, limiting the application of some quantitative population assessment methods, such as demographic models. The aim of the present study was to estimate, for the first time, age and individual growth of Z. exasperata. Biometric data from 244 individuals and 236 vertebrae were analysed. The largest number of banded guitarfish in fishery landings was observed during April and August, with a female:male sex ratio of 1:1.8. The size range was 56.4-103-cm total length (TL) for females and 51.6-92cm TL for males, with females being significantly larger than males (P<0.05). The periodicity of the vertebral edge suggests that growth band pairs form annually. The estimated age structure was 5-22.6 years for females and 4-19.6 years for males, with significant differences between sexes (P<0.01). The goodness-of-fit of three models was evaluated. For the von Bertalanffy growth model, the parameters were as follows. For females: Theoretical maximum length, L∞ ≤ 100.71cm TL; growth coefficient, k ≤ 0.144year-1; and theoretical age at length zero, t0 ≤ -0.39years. For males: L∞ ≤ 89.78cm TL; k ≤ 0.174year-1; and t0 ≤ -0.65years.

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