Absence of seasonal changes in reproductive function of cultured Atlantic salmon migrating into a Canadian river

Lacroix, G.; Galloway, Brendan J.; Knox, Derek; MacLatchy, Deborah L.

doi:10.1016/s1054-3139(97)80013-6

Cited by 5 publications

(6 citation statements)

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“…While frequency varies in time and space, not all farmed salmon that escape from sea cages and thereafter enter rivers are sexually mature (Carr, Lacroix et al, 1997;Lacroix, Galloway, Knox, & MacLatchy, 1997;Madhun et al, 2015). Escapees may also ascend rivers outside the normal migratory times for wild salmon and even outside the spawning period.…”

Section: Do Farmed Escapees Spawn In the Wild?mentioning

confidence: 99%

“…Also, in a recent study conducted in the River Namsen, middle Norway, most of the escapees entering the river were mature or maturing (Moe et al., ). In contrast, all of 29 small (0.4 kg) escapees captured in the River Steinsdalselva in western Norway in 2012 were immature (Madhun et al., ), and observations of large numbers of immature adults have been reported in rivers in Canada (Carr, Lacroix et al., ; Lacroix et al., ). Additionally, maturation status may differ between escapees captured in the very low reaches of rivers and river mouths, and further up in the system where spawning grounds typically occur.…”

Section: Ecology Preceding Introgressionmentioning

confidence: 99%

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Half a century of genetic interaction between farmed and wild Atlantic salmon: Status of knowledge and unanswered questions

et al. 2017

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Atlantic salmon (Salmo salar) is one of the best researched fishes, and its aquaculture plays a global role in the blue revolution. However, since the 1970s, tens of millions of farmed salmon have escaped into the wild. We review current knowledge of genetic interactions and identify the unanswered questions. Native salmon populations are typically genetically distinct from each other and potentially locally adapted. Outside Norway, introgression remains unquantified, and in all regions, biological changes and the mechanisms driving population-specific impacts remain poorly documented. Nevertheless, existing knowledge shows that the long-term consequences of introgression is expected to lead to changes in life-history traits, reduced population productivity and decreased resilience to future challenges. Only a major reduction in the number of escapees and/or sterility of farmed salmon can eliminate further impacts. K E Y W O R D Saquaculture, evolution, fish farming, fitness, genetic, hybrid

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Section: Do Farmed Escapees Spawn In the Wild?mentioning

confidence: 99%

Section: Ecology Preceding Introgressionmentioning

confidence: 99%

Half a century of genetic interaction between farmed and wild Atlantic salmon: Status of knowledge and unanswered questions

et al. 2017

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“…Jonsson (1997) demonstrated a relationship between the reproductive success of farmed fish and how long the fish had lived in nature before reaching sexual maturity. Lacroix et al (1997) found the rate of sexual maturation of sea cage escapees straying to the Magaguadavic River to be very low, averaging 15% from 199415% from to 199615% from , and Carr et al (1997b found that sea cage escapees in that river in 1994 failed to reach known spawning areas because their migration distance was less than that of wild salmon. These observations for sea cage escapees clearly enhance the relative impact that hatchery escapees could have on the wild stock.…”

Section: Discussionmentioning

confidence: 99%

Adult Return of Farmed Atlantic Salmon Escaped as Juveniles into Freshwater

Lacroix

Stokesbury

2004

Transactions of the American Fisheries Society

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“…Com relação à caracterização hormonal de teleósteos, Poortenaar et al (2001) evidenciaram o aumento de concentração de E 2 nas fêmeas de Seriola lalandi lalandi durante a vitelogênese, o mesmo ocorreu para Anguilla japonica (Matsubara et al, 2005), Salmo salar (Lacroix et al, 1997), Perca fluviatilis (Noaksson et al, 2005), Acheilognathus rhombea (AIDA, 1988).…”

Section: Discussionunclassified

“…Picos deste hormônio foram observados em Salmo salar nesta fase (Lacroix et al, 1997). No entanto, em Seriola lalandi lalandi, esses picos estão relacionados a machos com gametogênese parcialmente ou totalmente completa (Poortenaar et al 2001).…”

Section: Discussionunclassified

Aspectos reprodutivos e perfil hormonal dos esteróides sexuais do pirarucu, Arapaima gigas (SCHINZ,1822), em condições de cativeiro

et al. 2010

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RESUMOEsta pesquisa teve como objetivo caracterizar a reprodução e o perfil hormonal dos esteróides sexuais do pirarucu, Arapaima gigas, além de validar um aspecto do dimorfismo sexual secundário. O experimento foi realizado na Fazenda Santo Antônio II, em Presidente Figueredo-AM, no período de fevereiro de 2004 a fevereiro de 2005. Foram selecionados 24 exemplares e divididos em três grupos de oito peixes (grupo "A", "B" e "C" com pirarucus de mais de quatro anos de idade, com três anos e dois anos, respectivamente). Os pirarucus foram estocados em três tanques de 400m 2 , um para cada grupo. Aspectos comportamentais, como o interesse por alimento, brigas, formação de casais e presença de ninhos, foram observados ao longo de todo o experimento. Amostras de sangue foram coletadas mensalmente, de todos os peixes, observou-se a presença de uma mancha alaranjada no macho como uma característica sexual secundária. Foram mensurados os níveis de testosterona (T), 17beta-estradiol (E 2 ) e 17alfa-hidroxi-progesterona (17aOHP) através de radioimunoensaio (RIA) de fase sólida. Todos os machos dos grupos "A" e "B" puderam ser identificados pela mancha alaranjada na região inferior da cabeça, corroborada pela concentração de testosterona, comprovando o conhecimento empírico dos ribeirinhos. Os níveis de T e E 2 nos peixes do grupo "A" e "B" tiveram maiores picos no início do período de chuva, enquanto que o 17aOHP teve oscilações constantes e pequenos picos no final do período chuvoso, os peixes do grupo "C" acompanharam essa tendência em concentrações menores. PALAVRAS-CHAVE: pirarucu, reprodução, esteróides sexuais, Arapaima gigas. Reproductive Aspects and Sexual Steroids Hormonal Profiles of Pirarucu, Arapaima gigas (SCHINZ,1822), in Captivity Conditions ABSTRACTThe purpose of this study was to characterize the growth, reproduction and hormonal profile of pirarucu, Arapaima gigas, and validate one sexual dimorphism characteristic. The experiment was carried in the fish farm Santo Antonio II, Presidente Figueredo city in the state of Amazonas -Brazil, from February 2004 to February 2005 In the experiment, 24 fishes were selected and divided in three groups, with eight fish in each one. The pirarucus from "A" group were older than four years. In "B" group the fishes were three years old and in "C" group these were two years old. The pirarucus were stocked in 400 m 2 excavated ponds, one pond for each group. Reproductive behavior like feeding interest, fights, pair formation and presence of nest were observed. Blood samples were taken monthly from all fishes during the experiment period, the sexual dimorphism characteristic was observed. Testosterone (T), 17b-estradiol (E 2 ) and 17ahidroxi-progesterona (17aOHP) levels were measured by radioimunoassay (RIA) in solid phase. All males of group "A" and "B" could be identified by an orange mark under the head, and the levels of T validated this data, proving the empirical knowledge of river men. T and E 2 levels of group "A" and "B" picked in the beginning of raining period an...

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Absence of seasonal changes in reproductive function of cultured Atlantic salmon migrating into a Canadian river

Cited by 5 publications

References 4 publications

Half a century of genetic interaction between farmed and wild Atlantic salmon: Status of knowledge and unanswered questions

Half a century of genetic interaction between farmed and wild Atlantic salmon: Status of knowledge and unanswered questions

Adult Return of Farmed Atlantic Salmon Escaped as Juveniles into Freshwater

Aspectos reprodutivos e perfil hormonal dos esteróides sexuais do pirarucu, Arapaima gigas (SCHINZ,1822), em condições de cativeiro

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