The growth and reproductive endocrinology of adult triploid Pacific salmonids

Benfey, Tillmann J.; Dye, Helen M.; Solar, Igor I.; Donaldson, Edward M.

doi:10.1007/bf01875483

Cited by 77 publications

(43 citation statements)

References 31 publications

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“…It is usually impossible to express milt from triploid males (Lincoln and Scott, 1984), and hence it was not possible to assess their degree of testicular development without killing the tish. However, the timing of testicular development is considered to be similar in both diploid and triploid male trout of the same stock (Lincoln and Scott, 1984;Benfey et al, 1989). Thus, it is very likely that full gonadal development was reached in the triploid male trout without any accompanying change in the plasma growth hormone level.…”

Section: Discussionmentioning

confidence: 99%

Plasma growth hormone levels during sexual maturation in diploid and triploid rainbow trout (Oncorhynchus mykiss)

Sumpter

Lincoln

Bye

et al. 1991

General and Comparative Endocrinology

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Plasma growth hormone concentrations were determined in diploid and triploid rainbow trout of both sexes during sexual maturation. Diploid females grow large ovaries, whereas triploid female trout show no ovarian development. The plasma growth hormone concentration in triploid female trout remained low and unchanged throughout the study, whereas it rose slightly, but significantly, in the diploid females that matured, but not in those that remained immature. On the other hand, triploid males do develop testes like their diploid counterparts. In both groups spermiation was accompanied by a steady rise in the plasma growth hormone concentration. The results suggest that the elevated growth hormone concentration in mature male trout was a consequence not of reproduction per se, but of the loss of condition that accompanied spawning. This hypothesis was supported by the results from the females. Apart from a temporary loss in the mature diploids caused by stripping of the eggs, female trout did not lose condition, neither did they show any change in the plasma growth hormone concentration during the period when they ovulated. These results suggest that it was the nutritional insuffrciency accompanying reproduction in male fish that caused the elevation in growth hormone concentration. In fact, a strong negative correlation between the plasma growth hormone concentration and the condition factor of the fish was observed. Q

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Section: Discussionmentioning

confidence: 99%

Plasma growth hormone levels during sexual maturation in diploid and triploid rainbow trout (Oncorhynchus mykiss)

Sumpter

Lincoln

Bye

et al. 1991

General and Comparative Endocrinology

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“…Furthermore, this knowledge does not exist for triploid fish of any species. A better understanding of the response of triploids to a stressor is of interest because triploids possess fewer but larger cells (Swarup 1959;Small and Benfey 1987), and the triploid females do not develop any signs of sexual maturation (Benfey et al 1989); both of these characteristics may alter their stress response. Moreover, since surface area to volume ratios are reduced as cell size increases, the ability of triploid cells to respond to hormonal or neural stimuli may be diminished (Benfey 1991).…”

Section: Introductionmentioning

confidence: 99%

Cortisol, glucose and hematocrit changes during acute stress, cohort sampling, and the diel cycle in diploid and triploid brook trout (Salvelinus fontinalis Mitchill)

Biron

Benfey

1994

Fish Physiol Biochem

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102

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In this study, groups of diploid (control) and triploid brook trout were subjected to a 5 min acute handling/confinement stress. Blood samples were collected from equal numbers of diploid and triploid fish at regular predetermined intervals, beginning prior to confinement and continuing for up to 3h after confinement. These blood samples were used for the measurement of hematocrit and plasma cortisol and glucose concentrations. The effects of cohort sampling and the diel cycle on these variables were also analysed. Except for minor differences, both groups responded similarly to the acute stress, with short-term elevations in plasma cortisol and hematocrit levels, and a more sustained increase in plasma glucose levels. No significant differences were found between diploid and triploid fish in their reactions to cohort sampling. However, the act of removing an individual from a tank caused significant changes in plasma cortisol levels in cohorts remaining in that tank (p < 0.001). Significant diel effects were observed for both ploidy groups in plasma cortisol (p < 0.05) but not in plasma glucose or hematocrit.

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“…De manera general, en los peces, los ovarios de las hembras triploides permanecen en un estado primario de desarrollo (Benfey & Donaldson, 1988;Felip et al, 1999) probablemente asociado a los bajos niveles de gonadotropinas y otros esteroides sexuales, incluido el estradiol-17β, observados en algunas especies (Lincoln & Scott, 1984;Benfey et al, 1989;Tiwary & Ray, 2000;Felip et al, 2001). Lo anterior, finalmente, se refleja en una producción baja de vitelogenina por parte del hígado (Manning et al, 2004;Tiwary et al, 2004).…”

Section: Desarrollo Gonadal Y Proporción De Sexosunclassified

Fisiologia de los peces triploides

Alcántar‐Vázquez

2016

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RESUMEN.La triploidía se ha convertido en una herramienta recomendable para la acuicultura, ya que los problemas asociados con la maduración gonadal pueden ser eliminados o bien reducidos mediante la producción de peces triploides, los cuales son funcionalmente estériles. Aunque la posibilidad de esterilizar una gran cantidad de individuos ha convertido a la triploidía en un tema relevante económicamente, los cambios fisiológicos provocados por la adición de un tercer juego de cromosomas, ofrecen la posibilidad de estudiar procesos básicos en peces con diferente nivel de ploidía. A nivel fisiológico, la triploidía está estrechamente relacionada con el incremento del tamaño celular y sus repercusiones en varios procesos metabólicos y bioquímicos. El objetivo del presente trabajo es describir las principales consecuencias fisiológicas reportadas para peces marinos y dulceacuícolas, resultado de la inducción a la triploidía. Comprender estas consecuencias es de vital importancia para maximizar el desempeño de los peces triploides durante el cultivo. Palabras clave: triploidía, esterilidad, tamaño celular, crecimiento, eritrocito, desarrollo gonadal. Physiology of triploid fishABSTRACT. Triploidy has become a recommended tool for aquaculture since problems associated with gonadal maturation can be eliminated or reduced by producing triploid fish, which are functionally sterile. Although the possibility of sterilizing a large number of individuals has helped for triploidy to become an important issue economically, the physiological changes caused by the addition of a third set of chromosomes provides the opportunity to study basic processes in fish with a higher ploidy status. At physiological level the consequences of triploidy are closely related to the increase of cell size and its subsequent impact on various metabolic and biochemical processes. The aim of this work is to describe the main physiological consequences reported for marine and freshwater fishes resulting from the induction of triploidy. Understanding these consequences is of vital importance to maximize the performance of triploid fish under culture.

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The growth and reproductive endocrinology of adult triploid Pacific salmonids

Cited by 77 publications

References 31 publications

Plasma growth hormone levels during sexual maturation in diploid and triploid rainbow trout (Oncorhynchus mykiss)

Plasma growth hormone levels during sexual maturation in diploid and triploid rainbow trout (Oncorhynchus mykiss)

Cortisol, glucose and hematocrit changes during acute stress, cohort sampling, and the diel cycle in diploid and triploid brook trout (Salvelinus fontinalis Mitchill)

Fisiologia de los peces triploides

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