Controlling preharvest maturity in farmed Arctic char: A review from the Canadian perspective

Yossa, Rodrigue; Bardon‐Albaret, Agnès; Chiasson, Marcia; Liu, Qi; Duston, J.; Manning, T. H.; Benfey, Tillmann J.

doi:10.1111/jwas.12622

Cited by 7 publications

(5 citation statements)

References 87 publications

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“…These results contrast with the suggestion that anadromy is a plastic trait in charr (Moore et al., 2014; Nordeng, 1983) and has implications for the anadromous charr fishery in Labrador (Andrews & Lear 1956; Dempson et al., 2008; DFO, 2001), suggesting the need for independent management of morphs. The outlier genes we detected may be useful candidates to select against undesirable small body size in an aquaculture setting (Yossa et al., 2019). Given that increases in temperature and terrestrial primary productivity driven by climate change are expected to favour residents (Finstad & Hein, 2012; Reist et al., 2006), the outlier genes detected here also have practical applications towards the conservation of the anadromous morph.…”

Section: Discussionmentioning

confidence: 99%

Limited genetic parallelism underlies recent, repeated incipient speciation in geographically proximate populations of an Arctic fish (Salvelinus alpinus)

et al. 2020

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The genetic underpinnings of incipient speciation, including the genomic mechanisms which contribute to morphological and ecological differentiation and reproductive isolation, remain poorly understood. The repeated evolution of consistently, phenotypically distinct morphs of Arctic Charr (Salvelinus alpinus) within the Quaternary period offer an ideal model to study the repeatability of evolution at the genomic level. Sympatric morphs of Arctic Charr are found across this species' circumpolar distribution. However, the specific genetic mechanisms driving this morph differentiation are largely unknown despite the cultural and economic importance of the anadromous morph. We used a newly designed 87k SNP chip to investigate the character and consistency of the genomic differences among sympatric morphs within three recently deglaciated and geographically proximate lakes in Labrador, Canada. We found genetically distinct small and large morph Arctic Charr in all three lakes consistent with resident and anadromous morphs, respectively. A degree of reproductive isolation among sympatric morphs is likely given genome‐wide distributions of outlier SNPs and high genome‐wide FSTs. Across all lakes, outlier SNPs were largely nonoverlapping suggesting a lack of genetic parallelism driving morph differentiation. Alternatively, several genes and paralogous copies of the same gene consistently differentiated morphs across multiple lakes suggesting their importance to the manifestation of morphs. Our results confirm the utility of Arctic Charr as a model for investigating the predictability of evolution and support the importance of both genetic parallelism and nonparallelism to the incipient speciation of Arctic Charr morphs.

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Section: Discussionmentioning

confidence: 99%

Limited genetic parallelism underlies recent, repeated incipient speciation in geographically proximate populations of an Arctic fish (Salvelinus alpinus)

et al. 2020

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“…Similar development has been observed in the Swedish Arctic superior ® strain (Fisheries Board Research Station, Kälarne, Sweden) [17]. However, in Canada, where several strains of Arctic charr are farmed, preharvest maturation of males remains a problem, and production of all-female populations has been suggested as a countermeasure to improve the economic efficiency of the industry [18]. The biological response to a warming environment has generally been assumed to be independent of sex.…”

Section: Introductionmentioning

confidence: 69%

Effects of Early Thermal Environment on Growth, Age at Maturity, and Sexual Size Dimorphism in Arctic Charr

Árnason

Smáradóttir²,

Thorarensen

et al. 2022

JMSE

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The effects of early thermal environment on growth, age at maturity, and sexual size dimorphism in Arctic charr (Salvelinus alpinus) are investigated. This study is a 654-day long rearing trial split into two sequential experimental phases termed EP1 and EP2 and lasting 315 and 339 days, respectively. EP1 started at the end of the yolk sac stage when the experimental fish were divided into three groups and reared at different target temperatures (7, 10 and 12 °C). During EP2, all groups were reared at the same temperature (7–8 °C) until harvest (~1300 g). Growth rates increased with temperature from 7 to 12 °C, and at the end of EP1 the 12C group had 49.0% and 19.2% higher mean weight than groups 7C and 10C, respectively. Elevated early rearing temperatures were, however, found to cause precocious sexual maturation and reduce the long-term growth performance. At the end of EP2, the 7C group had 3.6% and 14.1% higher mean weight than 10C and 12C, respectively. Elevated early rearing temperatures had a much stronger effect on the maturity incidence of females, and while male-biased sexual size dimorphism (SSD) was found in all groups, the magnitude of SSD was positively associated with temperature.

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“…Outra abordagem para a criação de populações monossexo seria por meio da reversão sexual com uso de hormônios (Pandian & Sheela, 1995). A formação de planteis de reprodutores com maturação mais tardia (Yossa et al, 2019) também é proposta como uma possível solução.…”

Section: Discussionunclassified

DESENVOLVIMENTO GONADAL DO BEIJUPIRÁ, Rachycentron canadum, CRIADO EM MAR ABERTO EM PERNAMBUCO

Cavalli

2020

Rev. Bras. Eng. Pesca

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Este estudo analisou o desenvolvimento gonadal do beijupirá (Rachycentron canadum) criado em gaiolas flutuantes na plataforma continental de Pernambuco a fim de averiguar a possibilidade desses indivíduos se reproduzirem. Dos 132 exemplares amostrados entre janeiro e setembro de 2011, o comprimento total (CT) variou entre 26,2 e 61,0 cm, e o peso total (PT), entre 121 e 2.436 g. A proporção macho/fêmea foi de 1:1 e o índice gonadossomático (IGS) médio das fêmeas variou entre 0,37 e 1,38, sendo o maior valor classificado como em maturação final. Para os machos, os IGS médios oscilaram entre 0,25 e 0,62. A distribuição do CT e PT entre machos e fêmeas não apresentaram diferenças significativas. Foram encontrados machos em estágios imaturos, em maturação e maduros. Embora o período de criação relativamente curto (9 meses) não tenha permitido a amostragem de fêmeas plenamente maduras, os resultados indicam a possibilidade de reprodução de beijupirás criados intensivamente em gaiolas flutuantes no mar aberto de Pernambuco. O desenvolvimento dessa atividade deve considerar estratégias que minimizem ou evitem as fugas de ovos e/ou larvas para o ambiente natural.

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Controlling preharvest maturity in farmed Arctic char: A review from the Canadian perspective

Cited by 7 publications

References 87 publications

Limited genetic parallelism underlies recent, repeated incipient speciation in geographically proximate populations of an Arctic fish (Salvelinus alpinus)

Limited genetic parallelism underlies recent, repeated incipient speciation in geographically proximate populations of an Arctic fish (Salvelinus alpinus)

Effects of Early Thermal Environment on Growth, Age at Maturity, and Sexual Size Dimorphism in Arctic Charr

DESENVOLVIMENTO GONADAL DO BEIJUPIRÁ, Rachycentron canadum, CRIADO EM MAR ABERTO EM PERNAMBUCO

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