Effect of holding temperature on ovulation, egg fertility, plasma levels of reproductive hormones and in vitro ovarian steroidogenesis in the rainbow trout Oncorhynchus mykiss

Pankhurst, Neville William; Purser, GJ; Kraak, Glen Van Der; Thomas, Peter; Forteath, Gnr

doi:10.1016/s0044-8486(96)01374-9

Cited by 160 publications

(122 citation statements)

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“…Reductions in final egg size in thermally stressed fish have been reported in rainbow trout (Pankhurst & Thomas 1998) and Atlantic salmon Salmo salar (King et al 2003). This was associated with reductions in plasma E 2 levels, and levels of the yolk precursor vitellogenin (in turn synthesized by the liver in response to stimulation by E 2 ) in Atlantic salmon, but no change in plasma E 2 in rainbow trout (Pankhurst et al 1996, Pankhurst & Thomas 1998. Later studies on Atlantic salmon showed that depression of E 2 levels for only part of the period of vitellogenesis could generate reductions in plasma vitellogenin, egg size and subsequent fertility and survival (King et al 2007).…”

Section: Discussionmentioning

confidence: 89%

Effects of elevated water temperature and food availability on the reproductive performance of a coral reef fish

Donelson¹,

Munday²,

McCormick³

et al. 2010

Mar. Ecol. Prog. Ser.

222

199

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Climate change is predicted to increase ocean temperatures and alter plankton communities that are food for many marine fishes. To examine the effects of increased sea surface temperature and fluctuating food levels on reef-fish reproduction, breeding pairs of the coral reef damselfish Acanthochromis polyacanthus were maintained for a full summer breeding season in an orthogonal experiment comprising 3 temperature and 2 food levels. Water temperatures were the current-day average summer temperature for the collection location (28.5°C) and temperatures predicted to become close to the average for this region over the next 50 to 100 yr (30.0 and 31.5°C). Pairs were fed either a high or low quantity diet based on average and minimum feeding rates in the wild. Both water temperature and food supply affected reproductive output. Fewer pairs bred at elevated water temperatures and no pairs reproduced at either of the higher temperatures on the lower quantity diet. Furthermore, eggs produced were smaller at 30.0 and 31.5°C compared to those at 28.5°C. Histological analysis of the gonads and steroid hormone measurement did not reveal any apparent differences in patterns of oogenesis among treatments. However, spermatogenesis was reduced at high temperatures despite some increases in plasma androgen levels. Reduced breeding rate at warmer temperatures combined with reduced sperm production indicates the potential for significant declines in A. polyacanthus populations as the ocean warms.

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Section: Discussionmentioning

confidence: 89%

Effects of elevated water temperature and food availability on the reproductive performance of a coral reef fish

Donelson¹,

Munday²,

McCormick³

et al. 2010

Mar. Ecol. Prog. Ser.

222

199

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“…In contrast, plasma E 2 levels in March and April were reduced at 22 o C but there was a much less marked effect on in vitro E 2 production. In vitro work with rainbow trout (Pankhurst et al, 1996) showed that even though in vitro capacity to synthesise T and E 2 was impaired at 18 o C, plasma levels remained unchanged over 2 months. Plasma steroid levels reflect the sum of the processes of secretion, metabolism and excretion and may not mirror the exact effect found at tissue level in vitro.…”

Section: Discussionmentioning

confidence: 99%

“…Low temperature generally retards vitellogenesis and oocyte growth (Mackay and Lazier, 1993) but the effect of high temperature is more variable and depends on species, reproductive stage (Kagawa et al, 1983;Khan et al, 1999) and the regulatory factors involved at each stage (Van Der Kraak and Pankhurst, 1997). Studies on the cold-water teleosts rainbow trout (Oncorhynchus mykiss) (Pankhurst et al, 1996), Arctic charr (Salvelinus alpinus L.) (Gillet, 1991) and common wolffish (Anarhichas lupus L.) (Pavlov and Mokness, 1994), examining egg survival following exposure of broodstock to elevated temperature, suggested that effects were restricted to impairment of final oocyte maturation and ovulation. Similar effects have been demonstrated in Atlantic salmon (Salmo salar L.) (Taranger andHansen, 1993: King and, but recently have shown that processes earlier in the reproductive cycle may also be affected.…”

Section: Introductionmentioning

confidence: 99%

“…In vitro follicle incubations were used to assess ovarian function as isolated follicles respond readily to steroid precursors and gonadotropins (GtHs) by releasing steroid hormones into the incubation medium (Pankhurst et al, 1996;Pankhurst, 1997;Pankhurst and Riple, 2000). Specifically, the following effects on isolated ovarian follicles from fish held at elevated temperature were assessed: hormonal responsiveness to GtH; the integrity of intrafollicular signal transduction mechanisms (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Maintenance of Atlantic salmon (Salmo salar) at elevated temperature inhibits cytochrome P450 aromatase activity in isolated ovarian follicles

Watts

Pankhurst

King

2004

General and Comparative Endocrinology

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Atlantic salmon (Salmo salar) broodstock were transferred from natural (12-16 o C) to controlled temperatures of 14, 18 or 22 o C for 3 months during vitellogenesis. Fertility and survival were significantly reduced in eggs from broodstock held at 22 o C relative to 14 or 18 o C. Endocrine mechanisms were disrupted after only one month at 22 o C, as evidenced by decreased plasma vitellogenin (Vtg) and increased plasma testosterone (T) levels and, at later stages, decreased levels of plasma 17β-estradiol (E 2 ) . In vitro incubations of isolated ovarian follicles were carried out at monthly intervals, with follicles exposed to human chorionic gonadotropin, N, 2-0-dibutyryladenosine 3,5-cyclic monophosphate, and the gonadal steroid precursors 17-hydroxyprogesterone, androstenedione and T. After one month of exposure to controlled temperature, T synthesis was generally enhanced in response to all treatments at all temperatures, but E 2 synthesis was inhibited at 22 o C, suggesting temperature impairment of cytochrome P450 aromatase (P450 arom ) synthesis or activity. The effect became less marked as follicles matured suggesting that temperature sensitivity is stage dependent. The results of this study suggest that the inhibitory effects of elevated temperature on E 2 and Vtg synthesis, and subsequent egg development found in the present and earlier studies, arise at least partly, from temperature modulation of P450 arom .

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“…In some cases, temperature can simply play as a higher or lower limiting factor during certain gametogenesis stages. Thus meiotic maturation and ovulation in salmonids are inhibited over a higher threshold depending on species, of the order of 8 °C in the Arctic charr Salvelinus alpinus [55], and of 15 °C in rainbow trout [56]. Conversely, the same processes are reversibly blocked in the rainbow trout at excessively low temperatures [57].…”

Section: Importance Of Environmental Factorsmentioning

confidence: 99%

Particularities of reproduction and oogenesis in teleost fish compared to mammals

2005

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-Compared to mammals, teleost reproduction presents many original features. Reproductive strategies of species are diversified into numerous adaptations to a large variety of aquatic environments. This diversity may concern sexuality, spawning and parental behaviour, sensitivity to environmental factors, and specific features of gametogenesis such as the duration of vitellogenesis, and egg morphology. Sexuality presents a variety of natural modalities, from gonochorism to hermaphrodism. The absence of definitive arrest of body growth in the adult of most species gives a particular interest to the practical control of growth-reproduction interactions. Vitellogenesis, which represents an important metabolic effort for the maternal organism, involves the synthesis of vitellogenin, a specific glycolipo-phosphoprotein produced in the liver under estradiol stimulation, and its incorporation into oocytes by a receptor mediated process. Both estradiol synthesis in follicle cells and vtg uptake by vitellogenic follicles appear to be mainly controlled by FSH. Oocyte maturation is directly triggered by a progestin, or MIS (maturation inducing steroid) synthesised in follicle cells mainly under LH control, and acting through the non-genomic activation of a membrane receptor. Practical applications of some of these particularities result mainly from the external character of the fertilisation process and of embryonic development, which allows manipulating respectively egg chromosome stocks and sex differentiation. Moreover, the sensitivity of sex differentiation to exogenous factors favours the development of practical methods to control the sex of farmed populations. Finally, the sensitivity of reproductive mechanisms to xenobiotics has led to various kinds of bioassays for putative pollutants.reproductive strategies / sexuality / spawning / vitellogenesis / oocyte maturation / fertilisation

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Effect of holding temperature on ovulation, egg fertility, plasma levels of reproductive hormones and in vitro ovarian steroidogenesis in the rainbow trout Oncorhynchus mykiss

Cited by 160 publications

References 15 publications

Effects of elevated water temperature and food availability on the reproductive performance of a coral reef fish

Effects of elevated water temperature and food availability on the reproductive performance of a coral reef fish

Maintenance of Atlantic salmon (Salmo salar) at elevated temperature inhibits cytochrome P450 aromatase activity in isolated ovarian follicles

Particularities of reproduction and oogenesis in teleost fish compared to mammals

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