The arapaima, an emblematic fishery resource: genetic diversity and structure reveal the presence of an isolated population in Amapá

Nogueira, Fabrícia; Amaral, Marilu Teixeira; Malcher, Gabryele; Reis, Natália; Melo, Mauro André Damasceno de; Sampaio, Iracilda; Rêgo, Péricles Sena do; Araripe, Juliana

doi:10.1007/s10750-020-04292-0

Cited by 3 publications

(2 citation statements)

References 59 publications

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“…Conservation status is determined based on levels of reduction in population size, geographic range occupied, and number of populations. The Brazilian Environment Institute (IBAMA) classified Arapaima gigas as an overfished species or a species threatened with overfishing (Nogueira et al 2020). Arapaima gigas was listed on the CITES Appendix II since 1975.…”

Section: Biogeography and Conservation Status Of Arapaimamentioning

confidence: 99%

Fish, Fishing, and Conservation

Orth¹

2023

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People, places, and approaches to fishing are as varied as the diverse fish fauna that exist on the planet. As conservation planners recognize the value of substantial engagement of stakeholders in decision making and ineffectiveness of rigid topdown management approaches, Fish, Fishing, and Conservation asserts that all peoples must play a role in conservation. Through case studies, engaging narrative and graphics, and exercises, the 413-page, undergraduate-level text explores major motivations for fishing and non-fishing related values, responsible fisheries practices, the rights of all people to decide how to manage and conserve fish, their habitats, and how they are utilized. For many fishes, overfishing remains a pressing global problem for which appropriate solutions are not easily found nor implemented.Introductory chapters examine fish, fishing, and why fish matter and examine the role of values in driving conservation initiatives. Fish and their unique sensory capabilities are described along with a review of recent studies to examine issues of pain, sentience, and learning in fishes living in a foreign, underwater world. The text incorporates new findings in conservation and management leading readers to put

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Section: Biogeography and Conservation Status Of Arapaimamentioning

confidence: 99%

Fish, Fishing, and Conservation

Orth¹

2023

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“…This study is the first to present sufficient assessment data for a geographically restricted arapaima population to allow initial threat evaluations under IUCN criteria. It can perhaps serve as a benchmark for similar analyses of other arapaima populations such as those in coastal lagoons of Amap a State, Brazil (Nogueira et al, 2020). In this study, the status of recoveries of arapaima throughout the upper Essequibo, Rewa, and Rupununi River drainages were assessed using population estimates that were made regularly between 2001 and 2013.…”

Section: Government Agencies and Riverine Communities In Brazil Andmentioning

confidence: 99%

Recovery, conservation status, and environmental effects on arapaima populations in Guyana

Watson

Stewart

Clifford

et al. 2021

Aquatic Conservation

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Using population estimates that were made regularly between 2001 and 2013, the state of recovery of arapaima populations and their IUCN conservation status were assessed after they were almost extirpated from the upper Essequibo basin, Guyana. Recovery rates were compared across multiple areas with different degrees of access by fishers to evaluate effectiveness of conservation efforts. Population estimates were also used to investigate the influence of environmental factors on arapaima abundance in lakes with different morphometries, vegetation, and water types and to determine the relationship between the numbers of spawning individuals and subsequent recruits (at about age 2 years). The most recent census conducted in November–December of 2013 indicated a 5.6‐fold increase in overall abundance compared with 2001, with 4,591 individuals, of which 1,932 were juveniles (1.0–1.5 m total length) and 2,659 adults. Assessment of conservation status following IUCN criteria indicated that arapaima populations in the upper Essequibo basin in 2001 would have been considered borderline Critically Endangered, but in 2013 after conservation interventions, status would be categorized as Near Threatened. Arapaima in the Essequibo basin appear to favour larger but shallow lakes with low conductivity, clear water, and abundant aquatic macrophytes. Stock–recruitment relationships suggest that the entire upper Essequibo basin population may still be growing and that there is approximately a 1:1 juvenile to adult ratio. This ratio of juveniles to adults across all areas suggests a paucity of young fishes to sustain overall population growth, which might reflect widespread illegal removals of young fishes in the basin. Comparisons of arapaima densities in the upper Essequibo basin with those at four localities across the Amazon Basin, suggest that with enhanced conservation efforts in the Essequibo, populations could potentially increase two‐fold or more.

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A duplicated copy of id2b is an unusual sex-determining candidate gene on the Y chromosome of arapaima (Arapaima gigas)

Adolfi¹,

Kneitz

et al. 2021

Sci Rep

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Arapaima gigas is one of the largest freshwater fish species of high ecological and economic importance. Overfishing and habitat destruction are severe threats to the remaining wild populations. By incorporating a chromosomal Hi-C contact map, we improved the arapaima genome assembly to chromosome-level, revealing an unexpected high degree of chromosome rearrangements during evolution of the bonytongues (Osteoglossiformes). Combining this new assembly with pool-sequencing of male and female genomes, we identified id2bbY, a duplicated copy of the inhibitor of DNA binding 2b (id2b) gene on the Y chromosome as candidate male sex-determining gene. A PCR-test for id2bbY was developed, demonstrating that this gene is a reliable male-specific marker for genotyping. Expression analyses showed that this gene is expressed in juvenile male gonads. Its paralog, id2ba, exhibits a male-biased expression in immature gonads. Transcriptome analyses and protein structure predictions confirm id2bbY as a prime candidate for the master sex-determiner. Acting through the TGFβ signaling pathway, id2bbY from arapaima would provide the first evidence for a link of this family of transcriptional regulators to sex determination. Our study broadens our current understanding about the evolution of sex determination genetic networks and provide a tool for improving arapaima aquaculture for commercial and conservation purposes.

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The arapaima, an emblematic fishery resource: genetic diversity and structure reveal the presence of an isolated population in Amapá

Cited by 3 publications

References 59 publications

Fish, Fishing, and Conservation

Fish, Fishing, and Conservation

Recovery, conservation status, and environmental effects on arapaima populations in Guyana

A duplicated copy of id2b is an unusual sex-determining candidate gene on the Y chromosome of arapaima (Arapaima gigas)

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