Sea growth, smolt age and age at sexual maturation in Atlantic salmon

Jonsson, Nina; Jonsson, Bror

doi:10.1111/j.1095-8649.2007.01488.x

Cited by 52 publications

(57 citation statements)

References 24 publications

(33 reference statements)

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“…Nicieza & Braña 1993, Jonsson & Jonsson 2007. In contrast, post-smolt growth and age at maturation do not appear to exhibit any general association: in some populations rapid growth during the first sea-summer has been shown to result in early maturation (Nicieza & Braña 1993), but there is also evidence to suggest that poorly growing salmon tend to mature earlier because the advantage of postponing maturation is small (Jonsson & Jonsson 2007). In the case of the Asón population, smolt length and postsmolt growth were negatively correlated, and a connection between the temporal patterns in these traits and in the age at maturation could be detected: an increase in smolt length was accompanied by a decrease in post-smolt growth (Fig.…”

Section: Discussionmentioning

confidence: 96%

“…Increasing juvenile growth might increase smolt length and decrease post-smolt growth as a consequence of a negative correlation between these traits (e.g. Nicieza & Braña 1993, Jonsson & Jonsson 2007.…”

Section: Discussionmentioning

confidence: 99%

“…Such information is essential for understanding environmental and evolutionary processes that may underlie shifts in age and size of fish maturation. In particular, smolt size and growth during the first year at sea are critical for the timing of maturation in Atlantic salmon , Jonsson & Jonsson 2007 and, therefore, possible changes in post-smolt growth should be carefully investigated.…”

Section: Introductionmentioning

confidence: 99%

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Growth-history perspective on the decreasing age and size at maturation of exploited Atlantic salmon

Kuparinen¹,

Leaniz²,

Consuegra³

et al. 2009

Mar. Ecol. Prog. Ser.

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Decreases in age and size at maturation have been reported for several exploited fish populations, but little is known about possible changes in individual growth trajectories in the course of exploitation. We investigated changes in growth, age and size at maturation in a declining Atlantic salmon Salmo salar population subjected to strong fishing pressure. Based on historical catch records and scale samples collected between years 1948 and 2003, we estimated age and size at maturation and back-calculated individual growth trajectories. The age of the returning salmon declined, smolt size increased and post-smolt growth decreased during the study period. Reductions in age at maturation and shifts in growth trajectories occurred in parallel, suggesting that they were not independent of each other. Although our results cannot distinguish between plastic and genetic effects of exploitation on size and age at maturation, they support the contention that analyses of individual growth trajectories can provide important clues for understanding causes of life-history changes in exploited fish populations.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Growth-history perspective on the decreasing age and size at maturation of exploited Atlantic salmon

Kuparinen¹,

Leaniz²,

Consuegra³

et al. 2009

Mar. Ecol. Prog. Ser.

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show abstract

“…Moreover, sexual maturation occurs at different water salinities in salmon, such as at full salinity in the ocean (grilse and multi seawinter salmon), as precocious parr in freshwater (FW; Jonsson & Jonsson 2007), and also in fjords or estuarine areas with brackish water (Jonsson et al 2001). However, information on the possible effects of salinity on puberty is missing.…”

Section: Introductionmentioning

confidence: 99%

Salinity and photoperiod modulate pubertal development in Atlantic salmon (Salmo salar)

Melo

Andersson

Fjelldal

et al. 2013

Journal of Endocrinology

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The Atlantic salmon shows substantial life cycle plasticity, which also applies to the timing of puberty. While it is characterized by the activation of the brain-pituitary-gonad axis, many morphophysiological aspects of puberty and the influence of environmental conditions, such as water salinity, are not well understood in fish. Here, 12-month-old Atlantic salmon coming from an out-of-season smoltification regime in December were exposed to freshwater (FW) or seawater (SW) at 16 8C to stimulate puberty under a 24-h constant light (LL) or 12 h light:12 h darkness (LD) photoperiod. These four treatment groups (FWLL, SWLL, FWLD, and SWLD) were studied from January to March. Next to 11-ketotestosterone (11-KT) plasma levels, the expression of pituitary genes (gnrhr4, fshb, and lhb) and spermatogenesis was quantified. When spermatogonial proliferation started, fshb mRNA levels increased steeply and began to decrease when spermatogonial mitosis approached completion and most germ cells had reached meiotic or post-meiotic stages. Conversely, lhb mRNA levels increased progressively during spermatogenesis. Most males in all treatment groups matured, but exposure to SW resulted in the strongest stimulation of the onset of spermatogenesis and elevation of pituitary gnrhr4 and fshb mRNA levels. Later on, the LD photoperiod accelerated, irrespective of the salinity, the completion of spermatogenesis, associated with higher lhb mRNA and 11-KT plasma levels than in the LL groups. We find that both salinity and photoperiod modulated different aspects of spermatogenesis, and resulted in a differential activation of pituitary and testis functions; SW stimulating the onset and the shorter photoperiod the completion of spermatogenesis.

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“…La mayoría de los estudios sobre la edad de la primera madurez, se basan en poblaciones naturales (Heino & Gødo, 2002;Dieckmann & Heino, 2007;Jonsson & Jonsson, 2007;Domínguez-Petit et al, 2008;Ottersen, 2008), y es difícil establecer en qué medida, la edad y tamaño en que ocurre la primera madurez es influenciado por los genes o por el medio ambiente (Morita et al, 2005). Sin embargo, dada la variación fenotípica y genotípica en la edad y talla de primera madurez, no parece haber ningún umbral de tamaño fijo o edad en aquellas especies que han sido más estudiadas, como salmónidos, doradas y lubinas (Saillant et al, 2003;Carrillo et al, 2008;Taranger et al, 2009).…”

Section: Discussionunclassified

Evaluacion de la primera madurez sexual del huachinango del Pacifico (Lutjanus peru) nacido en cautiverio

Spanopoulos-Zarco

Estrada-Godínez

Pérez-Urbiola

et al. 2016

lajar

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RESUMEN.El huachinango del Pacífico, Lutjanus peru, es una especie atractiva para la acuicultura. Sin embargo, su reproducción en cautiverio en condiciones controladas no había sido factible, debido a la falta de conocimiento sobre las condiciones de manejo y el proceso reproductivo. En este estudio se evaluó la primera madurez sexual en cautiverio del huachinango del Pacífico, nacidos en el 2009 en el CIBNOR. La primera madurez sexual se determinó a los cuatro años de edad, con un peso promedio de 2.829 ± 80,9 g y longitud promedio de 540,3 ± 4,6 mm. Los primeros desoves ocurrieron en junio 2013, con la sincronización reproductiva entre machos y hembras en cautiverio, que coincidió cuando el fotoperiodo fue de 13 h luz y 11 h de obscuridad, con un aumento de temperatura del agua del estanque de 24,81 ± 1,4°C. El desove terminó en diciembre, con una disminución de temperatura 21,2 ± 1,5°C y 10 h luz. Se determinó la proporción sexual de 1:3,2 (hembra: macho). El tamaño de los huevos y la gota lipídica, disminuyeron conforme avanzó la temporada reproductiva..Se evaluó el nivel hormonal (estradiol, testosterona y 11-keto-testosterona) durante tres años. En cautiverio se determinó un ciclo reproductivo definido, en dos periodos; un periodo de reposo de diciembre a mayo, y un periodo reproductivo de junio a noviembre. Palabras clave: Lutjanus peru, primera madurez, desoves naturales, acuicultura. First sexual maturity evaluation of the Pacific red snapper (Lutjanus peru)born in captivity ABSTRACT. The Pacific red snapper Lutjanus peru, is an attractive species for aquaculture. Its reproduction in captivity under controlled conditions has not been feasible, due to the lack of knowledge on its basic reproductive biology and management conditions. For the first time, we evaluated the first sexual maturity stage of captive Pacific red snapper, born in 2009 at CIBNOR. The first sexual maturity was reached in four years with an average weight of 2,829 ± 80.9 g and average size of 540.3 ± 4.6 mm. Spawning occurred in June 2013, with a reproductive synchronization between males and females, which coincides with a photoperiod of 13 h of light and 11 h of darkness, an increase in the water ponds temperature to 24.81 ± 1.4°C. The final spawning occurred in December with a decrement of the water ponds temperature to 21.2 ± 1.5°C and 10 h light. The sex ratio was determined as 1:3.2 (female: male). The size of eggs and lipid drop decreased as the spawning season progressed. Hormone levels (estradiol, testosterone and 11-keto-testosterone), was evaluated for three years. We determined a defined reproductive cycle for the species in captivity in two periods: 1) a rest period, from December to May, and 2) a reproductive period from June to November.

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Sea growth, smolt age and age at sexual maturation in Atlantic salmon

Cited by 52 publications

References 24 publications

Growth-history perspective on the decreasing age and size at maturation of exploited Atlantic salmon

Growth-history perspective on the decreasing age and size at maturation of exploited Atlantic salmon

Salinity and photoperiod modulate pubertal development in Atlantic salmon (Salmo salar)

Evaluacion de la primera madurez sexual del huachinango del Pacifico (Lutjanus peru) nacido en cautiverio

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