Drivers of abundance and biomass of Brazilian parrotfishes

Roos, Natalia; Pennino, María Grazia; Carvalho, Adriana Rosa; Longo, Guilherme O.

doi:10.3354/meps13005

Cited by 33 publications

(18 citation statements)

References 79 publications

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“…2A). The smallest and largest specimens collected in the inshore reefs were 8.1 cm FL (10.3 g) and 41.8 cm FL (2035 g), respectively, with average (± SD) FL and weight of 32 ± 6.1 cm and 794 ± 398 g, whereas the smallest and largest specimens collected in the offshore reefs were 35 cm (975 g) and 55.9 cm (4955 g), respectively, with average FL and weight of 48.1 ± 4.8 cm and 2675 ± 849 g. The sizes of the sampled specimens reflected the size class distribution within each location, with largesized individuals absent in the inshore reefs and small-sized individuals absent in the offshore reefs (Roos et al 2016(Roos et al , 2019. The relationship between FL (cm) and TW (kg) was described by TW = 15 × 10 −6 (FL) 3.11 (Fig.…”

Section: Resultsmentioning

confidence: 96%

“…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. It includes offshore reefs located ~22 km from the northern coast in which depths vary from 6 to 60 m and which are mainly covered by coralline algae and Dictyota spp.…”

Section: Sampling Locationsmentioning

confidence: 99%

“…(Fig. 1; see Roos et al 2019 for a detailed description of sites). Both areas contain relatively high abundances of S. trispinosus; however, they differ in total abundance and size class distribution.…”

Section: Sampling Locationsmentioning

confidence: 99%

“…Both areas contain relatively high abundances of S. trispinosus; however, they differ in total abundance and size class distribution. While offshore reefs sustain considerably higher biomass due to the higher abundance of large-sized individuals, inshore reefs harbor mostly recruits and small juveniles (Roos et al 2019).…”

Section: Sampling Locationsmentioning

confidence: 99%

“…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. After a sharp population decline over the last 3 decades, S. trispinosus is listed as Endangered by the IUCN (Padovani-Ferreira et al 2012) and by the Brazilian Red List of Endangered Species (Ministerio do Meio Ambiente Decree No.…”

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: Resultsmentioning

confidence: 96%

Section: Sampling Locationsmentioning

confidence: 99%

Section: Sampling Locationsmentioning

confidence: 99%

Section: Sampling Locationsmentioning

confidence: 99%

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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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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Origins, Biogeography and Macroecology of the Southwestern Atlantic Reef Biodiversity

Pinheiro,

Bender,

Longo

et al. 2024

Brazilian Marine Biodiversity

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Drivers of abundance and biomass of Brazilian parrotfishes

Abstract: Table S1-Sample summary of the field effort and reef attributes across the 46 studied sites in the state of Rio Grande do Norte, Northeast Brazil.

Cited by 33 publications

References 79 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

Origins, Biogeography and Macroecology of the Southwestern Atlantic Reef Biodiversity

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