Multiple management strategies to control selectivity on parrotfishes harvesting

Roos, Natalia; Pennino, María Grazia; Lopes, Priscila F. M.; Carvalho, Adriana Rosa

doi:10.1016/j.ocecoaman.2016.09.029

Cited by 26 publications

(37 citation statements)

References 52 publications

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“…1). This region comprises the second-largest catch of Scarus trispinosus in Brazil, where a single village of small-scale fishers, among others that also fish for this species, harvests up to 9 t every year from a ~20 km 2 shallow reef area (Roos et al 2016). The region harbors heterogeneous reef habitats in terms of geomorphological features and benthic cover (Roos et al 2019, Rovira et al 2019.…”

Section: Sampling Locationsmentioning

confidence: 99%

“…A total of 95 specimens of S. trispinosus were sampled between July 2016 and March 2018; of these, 23 individuals were collected through scientific spearfishing at offshore reefs on the northern coast in depths between 8 and 12 m, and 68 were obtained through samplings at a fish market located on the eastern coast, where local fishers use inshore shallow patchy reefs to fish parrotfishes (see details in Roos et al 2016). Lastly, 4 smaller individuals (between 8.1 and 19.3 cm) were collected through research spearfishing at the inshore reefs.…”

Section: Sampling Effortmentioning

confidence: 99%

“…In Brazil, parrotfishes are targeted along the coast mostly by small-scale fisheries (Francini-Filho & Moura 2008, Bender et al 2014, Roos et al 2016. Some species have shown signs of decline, especially the endemic greenbeak parrotfish Scarus trispinosus.…”

Section: Introductionmentioning

confidence: 99%

“…Some species have shown signs of decline, especially the endemic greenbeak parrotfish Scarus trispinosus. The species is the largest parrotfish in the southwestern Atlantic and occurs along almost the entire Brazilian coast, although it is more common in warmer waters, and has been intensively targeted by fisheries in 2 areas encompassing its largest remnant populations: the Abrolhos Bank (Francini-Filho & Moura 2008) and in the coastal reef of Rio Grande do Norte state (Roos et al 2016). Large individuals (> 40 cm total length, TL) tend to use more offshore reefs, while juveniles are more common in coastal reefs (Roos et al 2019), where artisanal fisheries tend to be more intense.…”

Section: Introductionmentioning

confidence: 99%

“…Here we provide information on age, growth, and reproductive maturation of S. trispinosus in the second-most important fishing area of this species, the state of Rio Grande do Norte in northeast Brazil (Roos et al 2016). In particular, we highlight differences between the population structure of inshore and offshore reefs, and the need for incorporating this information into fisheries management actions.…”

Section: Introductionmentioning

confidence: 99%

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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: Sampling Locationsmentioning

confidence: 99%

Section: Sampling Effortmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Critical information for fisheries monitoring may be available in social media

Roos

Longo

2021

Aquatic Conservation

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Fisheries monitoring is essential to evaluate and manage fish populations. Effective monitoring is particularly challenging in low‐ and middle‐income countries where fisheries often occur at large spatial scales and include multiple techniques. Recreational spearfishing, for instance, can be detrimental to fish populations and is often underrepresented in management strategies due to the lack of data. Because recreational fishers frequently share pictures of their catches online, social media can harbour valuable information. As a case study, freely available pictures in social media were used to assess the impacts of spearfishing on the endemic and endangered Brazilian parrotfish, Scarus trispinosus, that has experienced a sharp population decline in recent decades due to overfishing. It was found that S. trispinosus is widely captured by recreational spearfishing and at larger sizes when compared to artisanal fisheries, revealing complementary fishing pressures operating on different life stages of this species and a lack of compliance to current regulations. The number of users sharing these contents increased between 2007 and 2018, but declined thereafter until 2020. Identifying where spearfishing is more intense and the most targeted life‐stages can inform prioritization of management strategies. Social media can be a rapid and low‐cost tool to obtain nationwide fisheries information, especially for recreational fishing activities that have a flawed monitoring. The public disclosure of ‘trophy fishes’ can reveal lack of compliance to existing regulations and help fill critical information gaps on complementary fishing pressures. This approach may be applicable for many species and types of trophy fishing, providing valuable and useful information for management and conservation.

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A critical review and knowledge gaps to assess and manage threatened parrotfishes’ stocks in Brazil

Queiroz-Véras

Ferreira²,

Freitas³

et al. 2023

Aquat Sci

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Multiple management strategies to control selectivity on parrotfishes harvesting

Cited by 26 publications

References 52 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

Critical information for fisheries monitoring may be available in social media

A critical review and knowledge gaps to assess and manage threatened parrotfishes’ stocks in Brazil

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