Diel patterns of larval drift of honmoroko <i>Gnathopogon caerulescens</i> in an inlet of Ibanaiko Lagoon, Lake Biwa, Japan

Kikko, Takeshi; Ishizaki, Daisuke; Ninomiya, Kouji; Kai, Yoshiaki; Fujioka, Yoshio

doi:10.1111/jfb.12570

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…They inhabit shallow estuaries during the larval and juvenile stages, moving to the pelagic zone as adults, determined from the recapture of alizarin complex one (ALC)‐marked fish (Kikko et al, ). Individuals migrate from the main lake to the lagoon and shoreline habitats for spawning, from April to July (Fujioka et al, ; Kikko et al, ; Kikko, Ishizaki, et al, ; Kikko, Usuki, et al, ). Many ALC‐marked fish, released to the lagoons, were subsequently recaptured offshore in the main lake during autumn and winter, suggesting that recruitment contributions from the lagoons to the main lake were substantial (although fluctuating yearly; unpubl.…”

Section: Specific Dates Of Major Steps In the Study Of Daily Growth Imentioning

confidence: 99%

Daily growth increments in otoliths of wild‐caught honmoroko Gnathopogon caerulescens

Kikko

Ishizaki

Yodo

et al. 2019

Journal of Fish Biology

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Otolith growth increments in wild‐caught alizarin complex one (ALC)‐marked honmoroko Gnathopogon caerulescens were examined to verify the veracity of the age determination method in cyprinids. ALC‐marked G. caerulescens recaptured from their natural environment had lapilli increment counts outside the ALC ring mark that had formed on a daily basis during the juvenile stage. This apparently being the first direct evidence of daily periodicity of otolith increment formation in wild‐caught cyprinids.

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Section: Specific Dates Of Major Steps In the Study Of Daily Growth Imentioning

confidence: 99%

Daily growth increments in otoliths of wild‐caught honmoroko Gnathopogon caerulescens

Kikko

Ishizaki

Yodo

et al. 2019

Journal of Fish Biology

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“…It lives in pelagic habitats in the northern basin (Figure 1) and migrates to lakeshores, lagoons, or inflow rivers from late February to early July for spawning (Fujioka & Saegusa, 2015; Kikko et al, 2020). Eggs are laid on plants or substrates in shallow water near the shore, where a decrease in water level can easily result in the desiccation of eggs (Fujioka, 2013; Kikko et al, 2014). Juveniles grow in nursery shores and lagoons during summer and move to pelagic habitats during the fall.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of genetic diversity in an endangered fish Gnathopogon caerulescens using environmental DNA and its potential use in fish conservation

2023

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Gnathopogon caerulescens, an endemic fish of Lake Biwa, Japan, is one of the most important fishes for lake fisheries. It has been listed as an endangered species following its population decline in the 1990s and thus needs conservation. An increasing number of studies have recently stressed on the importance of incorporating genetic diversity for conservation purposes. In this study, we aimed to evaluate the mitochondrial DNA haplotype composition of G. caerulescens using environmental DNA (eDNA) to determine the genetic diversity of this species. We developed an eDNA‐based haplotyping approach using high‐throughput sequencing (HTS), which can accurately detect and eliminate erroneous HTS reads, even when the target sequences are differentiated by a single or a few mismatches. Field surveys using the developed method successfully revealed the genetic structure of local G. caerulescens populations. We found star‐shaped haplotype networks with two major haplotypes accompanied by several rare haplotypes for all local populations except one, which suggested that the G. caerulescens population had undergone a historical expansion, and its population size did not shrink to the extent that rare haplotypes were eliminated during the population decline in the 1990s. We also observed that the genetic diversity was lower in the northern populations in terms of haplotype number and haplotype diversity (h), suggesting that the decline in population was more severe in the north than in the south. We demonstrated the practical use of eDNA analysis in population genetics of endangered species. Continuous monitoring using this approach would facilitate the conservation and management of fish resources.

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“…The fish spawns in lagoons adjacent to the northern basin and in shoreline habitats from April to July (Fujioka et al, ). The former are particularly suitable as nursery grounds, being highly productive and providing refuges from predation (Shibata et al, ; Kikko et al, ). Sub‐adult and adult individuals remain in the pelagic zone in the north basin (10–20 m in depth) in October and November and in deeper waters (60–90 m) in January and February (Nakamura, ; Fujioka & Saegusa, ).…”

Section: Introductionmentioning

confidence: 99%

Juvenile migration of the exclusively pelagic cyprinid, Gnathopogon caerulescens (Honmoroko) in Lake Biwa, Central Japan

Kikko

Ishizaki

Kuwamura

et al. 2018

Journal of Fish Biology

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Migration of wild and cultivated juvenile honmoroko Gnathopogon caerulescens of from the spawning and nursery areas in Lake Biwa were investigated, both in the Ibanaiko Lagoon and its outlet to Daido River, using beam-trawl surveys in 2013 and 2014. The study demonstrated migration of G. caerulescens from a nursery lagoon toward Lake Biwa after the juvenile stage. These findings appear to be the first direct evidence for migration of an exclusively pelagic cyprinid species from a littoral nursery to a pelagic adult habitat in a large deep lake.

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Diel patterns of larval drift of honmoroko Gnathopogon caerulescens in an inlet of Ibanaiko Lagoon, Lake Biwa, Japan

Cited by 13 publications

References 19 publications

Daily growth increments in otoliths of wild‐caught honmoroko Gnathopogon caerulescens

Daily growth increments in otoliths of wild‐caught honmoroko Gnathopogon caerulescens

Evaluation of genetic diversity in an endangered fish Gnathopogon caerulescens using environmental DNA and its potential use in fish conservation

Juvenile migration of the exclusively pelagic cyprinid, Gnathopogon caerulescens (Honmoroko) in Lake Biwa, Central Japan

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