Evidence for protandry in Polydactylus quadrifilis in the Kwanza Estuary, Angola, and its implications for local fisheries

Butler, Edward C.; Childs, A-R; Winkler, Alexander C.; Milner, Marianne V.; Potts, Warren M.

doi:10.1007/s10641-017-0699-6

Cited by 6 publications

(4 citation statements)

References 22 publications

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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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“…This is particularly relevant for larger individuals as body size was shown to be positively correlated with fight and total times. This correlation is particularly concerning due to the critical importance these large female fish have towards population reproductive output (Butler et al., 2018). To illustrate this point, the three largest fish captured during this study measured 126, 135 and 137 cm FL and were likely female (calculated length at protandrous sex change completion = 112.7 cm FL ‐ Butler et al, in review).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The Kwanza Estuary hosts some of the largest (over 50 kg) Polydactylus quadrifilis (Cuvier) individuals recorded globally and is therefore a popular angling destination, as well as a critical area of importance for the species (Butler, Childs, Winkler, Milner, & Potts, 2018). Additionally, the species is protandrous and the population seemingly relies on a few large highly fecund female fish for reproduction (Butler et al., 2018). As a result, these critically important larger individuals are at risk of experiencing heightened C&R‐related stress and mortality due to lengthy capture and handling times, which are commonly understood to impact negagtively on fish health and survival (Cooke et al., 2016; Skomal, 2007; Suski et al., 2007).…”

Section: Introductionmentioning

confidence: 99%

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Understanding the effects of recreational catch‐and‐release angling on an increasingly important foreign fishing tourism species, the giant African threadfin Polydactylus quadrifilis (Cuvier)

Butler

Childs

Duncan

et al. 2020

Fisheries Management Eco

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Foreign fishing tourism (FFT) is becoming increasingly popular in the developing world, where it often coexists alongside other important sectors involving domestic recreational anglers and dependant artisanal and subsistence fishing communities. Therefore, it is important that FFT operations use effective catch‐and‐release (C&R) angling to minimise negative impacts to locally important fishery species. Using reflex action mortality predictors (RAMPs) and physiological stress indicators, this study assessed the impacts of C&R angling within the FFT fishery targeting Polydactylus quadrifilis (Cuvier) on the Kwanza Estuary, Angola. Air exposure (cumulative link model (CLM): Z = 3.99, p < 0.01) and its interaction with fight time (Z = −2.377, p = 0.02) significantly predicted increased motor impairment. Handling practices were particularly important for larger reproductively valuable individuals as fish size was positively correlated with fight (Spearman's rank: r = 0.85, p < 0.01) and total times (r = 0.70, p < 0.01). Therefore, large fish should be handled in the water and a maximum air exposure time of 40 s is recommended for smaller fish. It is suggested that RAMP assessments can provide quick and effective tests for C&R‐driven impairment and provisions should be made for impaired individuals to recover adequately before release.

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Protandry in Fishes

Sunobe

2022

Hermaphroditism and Mating Systems in Fish

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Evidence for protandry in Polydactylus quadrifilis in the Kwanza Estuary, Angola, and its implications for local fisheries

Cited by 6 publications

References 22 publications

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

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

Understanding the effects of recreational catch‐and‐release angling on an increasingly important foreign fishing tourism species, the giant African threadfin Polydactylus quadrifilis (Cuvier)

Protandry in Fishes

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