Histological profiling of gonads depicting protandrous hermaphroditism in <i><scp>E</scp>leutheronema tetradactylum</i>

Shihab, I.; Gopalakrishnan, A; Vineesh, N.; Muktha, M; Akhilesh, K; Vijayagopal, P

doi:10.1111/jfb.13324

Cited by 24 publications

(23 citation statements)

References 19 publications

(24 reference statements)

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“…Following these criteria, and after an extensive review of the literature, functional hermaphroditism was confirmed in 7 orders, 27 families (6% of all fish families) and 94 genera, but without estimation of actual number of species for each type of hermaphroditism (Sadovy de Mitcheson and Liu 2008). More recent studies have investigated the incidence of hermaphroditism in specific groups, e.g., gobies (Cole 2010;Manabe et al 2013;Sunobe et al 2017), serranids (Erisman and Hastings 2011), polynemids (Shihab et al 2017;Butler et al 2018) and sparids (Pla et al 2020) to name some examples, but a global picture, based on current phylogenetic relationships, and with number of species for each major type of hermaphroditism taking into account only confirmed cases is missing. These last points, i.e., based on currently accepted phylogeny and only on confirmed species are very important.…”

Section: Introductionmentioning

confidence: 99%

Hermaphroditism in fish: incidence, distribution and associations with abiotic environmental factors

Pla

Maynou

Piferrer

2021

Rev Fish Biol Fisheries

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The distribution of hermaphroditism in fishes has traditionally been mainly explained by its dependence on biotic factors. However, correlates with major abiotic factors have not been investigated on a quantitative basis and at a global scale. Here, we determined the incidence of hermaphroditism in fish at the family and species level, tested the hypothesis that evolutionary relationships account for the poor presence of hermaphroditism in freshwater species, and tested the association of sexual systems with latitude, habitat type and depth. Functional hermaphroditism is reported in 8 orders, 34 families and 370 species of fishes, all teleosts. Sequential hermaphroditism predominates over simultaneous hermaphroditism at a ratio ~ 5:1 and protogyny (female-to-male sex change) predominates ~ 6:1 over protandry (male-to-female). We found 12 hermaphroditic species that can live in freshwater. However, seven of these species are from four primarily marine families while there are only five species from two mostly freshwater families. Protogynous and bi-directional sex changers have a tighter association with reef-associated tropical and subtropical habitats when compared to protandrous species, which tend to be more plastic in terms of distribution requirements. Finally, simultaneous hermaphrodite species live both in the deep sea and shallow waters in similar proportions. This study can be the basis for further research in specific groups for different purposes, including ecological and evolutionary issues as well as conservation and management of exploited species. Understanding the environmental correlates can help to forecast changes in the distribution or phenology of hermaphrodites in a global change scenario.

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Section: Introductionmentioning

confidence: 99%

Hermaphroditism in fish: incidence, distribution and associations with abiotic environmental factors

Pla

Maynou

Piferrer

2021

Rev Fish Biol Fisheries

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“…(2020), Shihab et al . (2017) and Sparks & Smith (2004; see Table 1 for GenBank Accession Numbers). Collated sequences aligned with MAFFT version 7 (Katoh & Standley, 2013) within Geneious and exported as a PHYLIP‐format file for downstream analyses.…”

Section: Methodsmentioning

confidence: 99%

“…While building the COI dataset and comparing the samples sequenced in this study to sequence data for threadfins databased and distributed through BOLD and/or GenBank, a number of previously generated sequences were found to be misidentified or mislabelled. These came from a variety of published (Betancur‐R et al ., 2013a,b; Chang et al ., 2017; Horne et al ., 2011; Khedkar et al ., 2014; Lakra et al ., 2011; Ribeiro et al ., 2012; Shihab et al ., 2017; Thu et al ., 2019; Qu et al ., 2020; Zhong et al ., 2021) and unpublished works. The recent study by Gopalakrishnan et al .…”

Section: Methodsmentioning

confidence: 99%

Molecular phylogeny of the threadfin fishes (Polynemidae) using ultraconserved elements

Girard

Davis

Baldwin

et al. 2022

Journal of Fish Biology

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Threadfins (Teleostei: Polynemidae) are a group of fishes named for their elongated and threadlike pectoral‐fin rays. These fishes are commonly found in the world's tropical and subtropical waters, and are an economically important group for people living in these regions, with more than 100,000 t harvested in recent years. However, we do not have a detailed understanding of polynemid evolutionary history such that these fishes can be monitored, managed and conserved as an important tropical food source. Recent studies hypothesize at least one genus of threadfins is polyphyletic, and no studies have focused on generating a hypothesis of relationship for the Polynemidae using DNA sequences. In this study, we analyse a genomic dataset of ultraconserved‐element and mitochondrial loci to construct a phylogeny of the Polynemidae. We recover the threadfins as a clade sister to flatfishes, with the most taxonomically rich genus, Polydactylus, being resolved as polyphyletic. When comparing our dataset to data from previous studies, we find that a few recent broad‐scale phylogenies of fishes have incorporated mislabelled, misidentified or chimeric terminals into their analyses, impacting the relationships of threadfins they recover. We highlight these problematic sequences, providing revised identifications based on the data sequenced in this study. We then discuss the intrarelationships of threadfins, highlighting morphological or ecological characters that support the clades we recover.

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“…However, E. tetradactylum is believed to be declining rapidly across much of its tropical Indo-West Pacific range, and is classified as endangered by the IUCN [ 6 ]. Like many fish, E. tetradactylum is a protandrous hermaphrodite that can undergo sex change at different ages [ 4 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Genome of the four-finger threadfin Eleutheronema tetradactylum (Perciforms: Polynemidae)

Nong

et al. 2020

BMC Genomics

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Background Teleost fish play important roles in aquatic ecosystems and aquaculture. Threadfins (Perciformes: Polynemidae) show a range of interesting biology, and are of considerable importance for both wild fisheries and aquaculture. Additionally, the four-finger threadfin Eleutheronema tetradactylum is of conservation relevance since its populations are considered to be in rapid decline and it is classified as endangered. However, no genomic resources are currently available for the threadfin family Polynemidae. Results We sequenced and assembled the first threadfin fish genome, the four-finger threadfin E. tetradactylum. We provide a genome assembly for E. tetradactylum with high contiguity (scaffold N50 = 56.3 kb) and high BUSCO completeness at 96.5%. The assembled genome size of E. tetradactylum is just 610.5 Mb, making it the second smallest perciform genome assembled to date. Just 9.07–10.91% of the genome sequence was found to consist of repetitive elements (standard RepeatMasker analysis vs custom analysis), making this the lowest repeat content identified to date for any perciform fish. A total of 37,683 protein-coding genes were annotated, and we include analyses of developmental transcription factors, including the Hox, ParaHox, and Sox families. MicroRNA genes were also annotated and compared with other chordate lineages, elucidating the gains and losses of chordate microRNAs. Conclusions The four-finger threadfin E. tetradactylum genome presented here represents the first available genome sequence for the ecologically, biologically, and commercially important clade of threadfin fish. Our findings provide a useful genomic resource for future research into the interesting biology and evolution of this valuable group of food fish.

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Histological profiling of gonads depicting protandrous hermaphroditism in Eleutheronema tetradactylum

Cited by 24 publications

References 19 publications

Hermaphroditism in fish: incidence, distribution and associations with abiotic environmental factors

Hermaphroditism in fish: incidence, distribution and associations with abiotic environmental factors

Molecular phylogeny of the threadfin fishes (Polynemidae) using ultraconserved elements

Genome of the four-finger threadfin Eleutheronema tetradactylum (Perciforms: Polynemidae)

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