Using optimised otolith sectioning to determine the age, growth and age at sexual maturity of the herbivorous fish Kyphosus bigibbus: with a comparison to using scales

Ogino, Yoshimi; Furumitsu, Keisuke; Kiriyama, Takanari; Yamaguchi, Atsuko

doi:10.1071/mf19231

Cited by 12 publications

(8 citation statements)

References 68 publications

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“…Two other kyphosids, the silver, Scorpis lineolata , and sea, S. aequipinnis , sweeps are both long‐lived (maximum ages of 54 and 78 years, respectively) and are highly susceptible to localized depletion (Coulson et al ., 2012; Stewart & Hughes, 2005). The only available age estimates for a Kyphosus species, grey drummer, K. bigibbus , indicate that this species attains ages of at least 46 years (Ogino et al ., 2020) whereas preliminary age estimates for K. sydneyanus suggest that this species can attain ages >90 years (P.C. Coulson unpubl.…”

Section: Discussionmentioning

confidence: 99%

Quantifying teleost discards in the shark fisheries of Western Australia

Braccini¹,

Bartes

Coulson³

2022

Journal of Fish Biology

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Quantifying discards is essential for assessing the impact of fisheries on non-target species and the ecosystems in which these fisheries operate. In Western Australia (WA), fishers are required only to report catches of retained species. For the currently operating shark fisheries of WA, the authors quantified catch time series of discarded teleosts using data from at-sea observers collected since 1993. Sixty-two teleost species were observed in the catch of which 20 were routinely discarded. The most commonly discarded teleosts were western buffalo bream/silver drummer, Kyphosus cornelii/K. sydneyanus, and dusky morwong, Dactylophora nigricans. Annual discards peaked in the 1990s; nonetheless, current discard levels, 36.9 ± 2.1 (S.E.) t year À1 , are much lower than the overall annual retained catches (c. 1000 t year À1 ).The catch time series reconstructed in this study are important inputs for assessing the ecosystem-based approach used for managing WA's shark fisheries.

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Section: Discussionmentioning

confidence: 99%

Quantifying teleost discards in the shark fisheries of Western Australia

Braccini¹,

Bartes

Coulson³

2022

Journal of Fish Biology

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“…While no evidence of spawning or settlement of juveniles has been documented, K . biggibus has become more abundant in recent decades in Japan and can live up to 46 years (Ogino et al., 2020). The available reports about the recruitment of other species of kyphosids indicate an association of juveniles with shallow reefs (Moran & Clements, 2002; Rimmer, 1986; Silvano & Güth, 2006).…”

Section: Discussionmentioning

confidence: 99%

Persistence of tropical herbivores in temperate reefs constrains kelp resilience to cryptic habitats

et al. 2021

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Global warming is facilitating the range expansion of tropical herbivores, causing a tropicalization of temperate marine ecosystems, where tropical herbivores can suppress habitat‐forming macrophytes, supporting the resilience of canopy‐free ecosystem states. However, currently we lack a thorough understanding of the mechanisms that, on one hand, support the persistence of tropical herbivores and on the other support the recovery of temperate foundation species in tropicalized ecosystems, a required knowledge to predict potential regime shifts and reversals to the baseline state of the ecosystem. This study tested processes behind the persistence of the tropicalization of temperate reefs which experienced a complete loss of their kelp forests and an influx of tropical herbivores following a marine heatwave in 2011. For this, we assessed the feedback mechanisms that maintain turf‐dominated states (recruitment of tropical herbivores, browsing and grazing rates and turf cover) and those that resist it (kelp recruitment, survival and reproductiveness). We found that the reefs remained tropicalized with high abundances of turf and tropical herbivores after 9 years from the regime shift. The rabbitfish Siganus fuscescens and the chub Kyphosus bigibbus were the most important herbivores whose persistence was supported by the adjacent reef lagoon, where seagrass meadows and the backreef habitats hosted juveniles of both species, particularly rabbitfish. Tropical herbivores exerted a strong top–down control on turf seaweed and kelp during herbivory assays, rapidly consuming kelp individuals in open areas. However, in topographical refuges in the reefs, herbivory was low and kelp individuals survived, with some having reproductive tissue. Synthesis. Our findings incorporate the importance of nursery grounds for tropical herbivores and herbivory refugia for kelp individuals into the tropicalization model, where the former increases the resilience of canopy‐free states and the latter might facilitate recovering kelp populations. The restoration of abundant warm‐resistant kelp populations in shelters could provide local sources of propagules to recolonize open spaces; however, our results suggest that the reduction of herbivory and the provision of turf‐free substratum would be necessary to boost the recovery of kelp forests.

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“…Although Garrett (1997) suggested that otoliths of E. tetradactylum be sectioned prior to reading, Pember et al (2005) found that sectioning did not improve the accuracy of age estimation in this species. In this study, to determine whether otolith sectioning was useful, otoliths of 72 specimens were sectioned transversely following the method described by Ogino et al (2020) and investigated under a stereoscopic microscope.…”

Section: Otolith Macrostructurementioning

confidence: 99%

Aseasonal and short life cycles of the protandrous hermaphrodite blue threadfin (Eleutheronema tetradactylum) in a near-equatorial tropical region

et al. 2023

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Context. Eleutheronema tetradactylum is exploited throughout its distribution in the Indo-West Pacific region. However, there is a lack of data on its life cycle in near-equatorial regions and the northern hemisphere. Aim. To investigate the age, growth, sex change and reproduction of Eleutheronema tetradactylum in southern Thailand. Methods. Analysis of length, otolith and gonad data of 449 fish. Key results. Contrary to findings from regions at higher latitudes, otoliths did not show seasonal increment formation. Instead, with the exception of large individuals, daily increments were distinguishable. Within the age range of 69-341 days, growth was linear, with results indicating a total length of 430 mm (69% of maximum length) at 1 year. The youngest mature male was 137 days old. Moreover, the length at which half the individuals changed from male to female was 376 mm, corresponding to 282 days. The gonadosomatic index indicated no specific spawning season, and the hatch-date calculations indicated year-round hatching. Conclusions. Eleutheronema tetradactylum inhabiting near-equatorial regions is characterised by rapid population turnover compared with populations of higher latitudes. Implications. Our findings indicated life-history variability, including seasonality loss in near-equatorial habitats, of an important coastal fish. This information is important for species conservation.

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Using optimised otolith sectioning to determine the age, growth and age at sexual maturity of the herbivorous fish Kyphosus bigibbus: with a comparison to using scales

Cited by 12 publications

References 68 publications

Quantifying teleost discards in the shark fisheries of Western Australia

Quantifying teleost discards in the shark fisheries of Western Australia

Persistence of tropical herbivores in temperate reefs constrains kelp resilience to cryptic habitats

Aseasonal and short life cycles of the protandrous hermaphrodite blue threadfin (Eleutheronema tetradactylum) in a near-equatorial tropical region

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