Growth and maturation of the redlip parrotfish <i><scp>S</scp>carus rubroviolaceus</i>

Taylor, Brett M.; Pardee, Cassandra

doi:10.1111/jfb.13309

Cited by 7 publications

(2 citation statements)

References 28 publications

(37 reference statements)

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“…Maximum sizes and ages at lower latitudes are expected to be lower, since age-based demography of reef fishes varies with sea temperature (e.g. Choat et al 2003, Robertson et al 2005, Taylor & Pardee 2017, Taylor et al 2019. Despite potential differences in longevity between individuals in our study area and in the Abrolhos Bank, age and size of maturation were comparable between these regions (Table 1).…”

Section: Discussionmentioning

confidence: 82%

Demography of the largest and most endangered Brazilian parrotfish, Scarus trispinosus, reveals overfishing

Roos

Taylor

Carvalho

et al. 2020

Endang. Species. Res.

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Many parrotfishes (Labridae: Scarinae) have life history traits, including late maturation and long lifespans, that make them vulnerable to overfishing. The greenbeak parrotfish Scarus trispinosus is the largest Brazilian endemic parrotfish and has been harvested in reefassociated fisheries along the coast. After a sharp population decline, S. trispinosus is now considered by the IUCN to be an Endangered species. We provide an assessment of age-based and reproductive biology for this species and discuss applications for fisheries management. We sampled 95 individuals from inshore and offshore reefs from Rio Grande do Norte state, northeast Brazil, both obtained from artisanal fishing landings and fishery-independent collections. All sampled specimens were females with fork lengths (FL) ranging from 8.1 to 55.9 cm and ages ranging from 0.3 to 7 yr, with estimated median maturity (L 50 ) of 39.2 cm FL and median age (A 50 ) of 4.2 yr. Size class distributions indicate that the inshore reefs are mostly inhabited by juveniles under L 50 , whereas the offshore reefs are inhabited by mature individuals, suggesting an ontogenetic habitat shift from inshore to offshore reefs around the timing of maturation. The fishing pressure on this species is concentrated in inshore reefs, therefore mostly on immature individuals, which may be severely affecting the reproductive capacity of this species. This information is useful to guide size-based fisheries management, such as regulating minimum capture size and fishing gears that capture individuals smaller than L 50 . Managing fisheries of endangered species with late maturity and complex reproductive cycles such as S. trispinosus is imperative to aid recovery.

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Section: Discussionmentioning

confidence: 82%

Demography of the largest and most endangered Brazilian parrotfish, Scarus trispinosus, reveals overfishing

Roos

Taylor

Carvalho

et al. 2020

Endang. Species. Res.

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“…The phenomenon of sex change was not considered, but literature did not report problems for the fit of a VBGF (c.f. Taylor and Pardee, 2017). Where fish came from different locations (e.g.…”

Section: Discussionmentioning

confidence: 99%

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Supplemental Information 1: Raw Data

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Bertalanffy proposed the differential equation m´(t) = p × m (t) a-q × m (t) for the description of the mass growth of animals as a function m(t) of time t. He suggested that the solution using the metabolic scaling exponent a = 2/3 (von Bertalanffy growth function VBGF) would be universal for vertebrates. Several authors questioned universality, as for certain species other models would provide a better fit. This paper reconsiders this question. Using the Akaike information criterion it proposes a testable definition of 'weak universality' for a taxonomic group of species. (It roughly means that a model has an acceptable fit to most data sets of that group.) This definition was applied to 60 data sets from literature (37 about fish and 23 about non-fish species) and for each dataset an optimal metabolic scaling exponent 0 ≤ a opt < 1 was identified, where the model function m(t) achieved the best fit to the data. Although in general this optimal exponent differed widely from a = 2/3 of the VBGF, the VBGF was weakly universal for fish, but not for nonfish. This observation supported the conjecture that the pattern of growth for fish may be distinct. The paper discusses this conjecture.

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A role for encrusting, endolithic sponges in the feeding of the parrotfish Scarus rubroviolaceus? Evidence of further trophic diversification in Indo-Pacific Scarini

Nicholson,

Clements

2024

Coral Reefs

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Growth and maturation of the redlip parrotfish Scarus rubroviolaceus

Cited by 7 publications

References 28 publications

Demography of the largest and most endangered Brazilian parrotfish, Scarus trispinosus, reveals overfishing

Demography of the largest and most endangered Brazilian parrotfish, Scarus trispinosus, reveals overfishing

Untitled

A role for encrusting, endolithic sponges in the feeding of the parrotfish Scarus rubroviolaceus? Evidence of further trophic diversification in Indo-Pacific Scarini

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