Relationship between temperature, ovarian recrudescence, and plasma cortisol level in Tilapia aurea (Cichlidae, Teleostei)

Terkatin-Shimony, Aviva; Ilan, Z.; Yaron, Z.; Johnson, Donald W.

doi:10.1016/0016-6480(80)90117-3

Cited by 23 publications

(6 citation statements)

References 16 publications

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“…The resting levels of cortisol as measured in the present study does not differ from those reported previously in this species (Terkatin-Shimony et a!., 1980). Cortisol levels recorded in fish restrained for 15 min in a net, were similar to those found 60 min after bleeding, and were about two-fold higher than the resting levels (Figs 1 & 2, Table I).…”

Section: Discussionsupporting

confidence: 82%

Interference of o,p'DDD with interrenal function and cortisol metabolism in Sarotherodon aureus (Steindachner)

Ilan

Yaron

1983

Journal of Fish Biology

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The purpose of this study was to investigate possible effects of organochlorine residues on cortisol balance in a freshwater fish. The combined stress of netting, handling and blood sampling in Sarotherodon aureus normally results in a twofold increase of circulating cortisol, within 30-60 min. Fish treated with o,p'DDD (50 mg kg-1) had higher resting level of cortisol than before treatment (1 55.8 k 12.7 v. 86.9 f 11.2 ng m1-I; n = 16). No further increase in cortisol level occurred in these fish after exposure to stress; this inability to respond was maintained for more than 120 days. A recovery of the response to ACTH by superfused interrenal tissue from the treated fish was observed 255 days after treatment. Successive blood sampling of o,p'DDD-treated fish, injected intracardially with labelled cortisol, have shown that the half-life of the steroid in the circulation is prolonged by 370% compared with controls. The hepatic metabolism of cortisol was studied by incubating liver slices with the labelled hormone. Hepatic tissue from o,p'DDD-treated fish metabolized cortisol slower than livers from controls. The high resting level of cortisol in plasma of fish treated with o,p'DDD may be attributed to the retarded metabolism of the steroid by the liver. The lack of augmented cortisol levels in response to stress is attributed to the interference of the organochlorine with the response of the interrenal tissue to the stress-induced surge of endogenous ACTH.

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Section: Discussionsupporting

confidence: 82%

Interference of o,p'DDD with interrenal function and cortisol metabolism in Sarotherodon aureus (Steindachner)

Ilan

Yaron

1983

Journal of Fish Biology

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“…The gradual increase in seed production starting from March coincides with the gradual increase in water temperature and photoperiod (Table 2), indicating the positive effect of temperature and photoperiod in inducing reproduction. A similar trend was observed in O. mossambicus, O. niloticus, O. aureus and Florida red tilapia (Mironova 1977;Terkatin-Shimony et al 1980;Behrends & Smitherman 1983;Bautista, Carlos & San Antonio 1988;Ernst, Watanabe, Ellingson, Wicklund & Olla 1991).…”

Section: Ambient Conditionssupporting

confidence: 72%

“…This demonstrates the effect of low temperature in depressing spawning performance. Terkatin-Shimony, Ilan, Yaron & Johnson (1980) reported that females of O. aureus kept at 17.0°C had regressed ovaries. Jalabert & Zohar (1982) stated that low temperature (15.0-22.0°C) during part of the year inhibited reproduction, and caused retardation of spermatogenesis in males and inhibition of exogenous vitellogenesis in females.…”

Section: Ambient Conditionsmentioning

confidence: 98%

Effects of controlling temperature and light duration on seed production in tilapia, Oreochromis spilurus (Günther)

Ridha¹,

Cruz²,

Al-Ameeri³

et al. 1998

Aquaculture Res

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An experiment was conducted to compare the seed production of tilapia, Oreochromis spilurus (Gü nther), under ambient water temperature and photoperiod, and under controlled water temperature (29.0 Ϯ 2.0°C), and photoperiods of 13 and 14 h day -1 . Male and female breeders with average weights of 155.4 and 78.7 g, respectively, were stocked in nine 1.04 ϫ 1.04 ϫ 0.40 m (L ϫ W ϫ H) fibreglass tanks. Each tank was stocked with two males and six females. Seed collection was carried out biweekly for 300 days. The results showed that the seed kg -1 female day -1 , seed m -2 day -1 , total seed production per tank and spawning rates of females were highest during the 14 h day -1 photoperiod (112.4, 77.4, 24 724 and 42.1%, respectively), followed by ambient spawning conditions (104.0, 57.9, 18 356 and 36.6%, respectively), and lowest during the 13 h day -1 photoperiod (49.5, 36.5, 12 021 and 25.7%, respectively). Under ambient spawning conditions, peak spawning occurred in May. Monthly seed production was affected by changes in temperature and light duration. In both controlled photoperiods, the peak of seed production was observed during the first month after stocking. In all treatments, spawning declined gradually after the peak, which can be attributed to exhaustion of the breeders. The findings of this study indicate that seed production of O. spilurus in Kuwait can be extended beyond the restricted spawning season of 6-7 months by maintaining water temperature at 29.0 Ϯ 2.0°C and photoperiod at 14 h day -1 .

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“…Details of fish maintenance and of cortisol determination by radioimmunoassay have been described previously (Terkatin-Shimony, Ilan, Yaron & Johnson, 1980). Head kidneys containing the interrenal tissue were excised from control or treated fish, cut into fragments and superfused according to the method of .…”

Section: Methodsmentioning

confidence: 99%

Suppression by Organochlorines of the Response to Adrenocorticotrophin of the Interrenal Tissue in Sarotherodon Aureus (Teleostei)

Ilan¹,

Yaron²

1980

Journal of Endocrinology

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Superfused interrenal tissue of Sarotherodon aureus responded to ACTH with increased release of cortisol. The response to ACTH of interrenal tissue taken from fish treated with the organochlorine insecticide 1,1-dichloro-2-(o-chlorophenyl)-2-(p-chlorophenyl) ethane (o,p-DDD; 50 mg/kg) in vivo was almost totally abolished. Lower doses were less effective. The response was also suppressed by exposure in vitro of the interrenal tissue to the organochlorine; there seemed to be a dose-response to o,p-DDD over the range of 0.023 to 1 mg/l. Also 1,1-dichloro-2,2-bis (p-chlorophenyl) ethylene (p,p'-DDE) was effective in suppressing the response to ACTH at concentrations of 50--150 mg/l; 1,1,1-trichloro-2,2-bis (p-chlorophenyl) ethane (p,p'-DDT) or the polychlorinated biphenyl, Aroclor 1254, were ineffective at 50 mg/l. No suppressive effect of o,p-DDD on output of cortisol could be detected in superfusion when N6,O2'-dibutyryl cyclic AMP (20 mmol/L) was substituted for ACTH. This may indicate that the interference of o,p-DDD with the interrenal response to ACTH results from an interruption in the generation of cyclic AMP.

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Relationship between temperature, ovarian recrudescence, and plasma cortisol level in Tilapia aurea (Cichlidae, Teleostei)

Cited by 23 publications

References 16 publications

Interference of o,p'DDD with interrenal function and cortisol metabolism in Sarotherodon aureus (Steindachner)

Interference of o,p'DDD with interrenal function and cortisol metabolism in Sarotherodon aureus (Steindachner)

Effects of controlling temperature and light duration on seed production in tilapia, Oreochromis spilurus (Günther)

Suppression by Organochlorines of the Response to Adrenocorticotrophin of the Interrenal Tissue in Sarotherodon Aureus (Teleostei)

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