Response to cryptorchidism of the testis and epididymis of the opossum (Didelphis virginiana)

Scott, Jane N.; Fritz, Hans; Nagy, Frank

doi:10.1530/jrf.0.0570175

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…Development of testes in the 34ЊC-treated fish was notably inhibited compared with that in the controls (27ЊC), and inhibition was much larger in males from the 36ЊC treatment. Exposure to elevated temperature also has been reported to cause an increase in collagen deposition (fibrosis) in the vertebrate testis (Scott et al 1979;Pinart et al 1999;Fat-Halla 2000). In yearling channel catfish, Fat-Halla (2000) noted an increase in collagen formation within the testis of fish exposed to 34ЊC and 36ЊC for 4 weeks.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Short‐Term Exposure to High Temperature as a Tool to Suppress the Reproductive Development of Channel Catfish for Aquaculture

Byerly

Fathalla²,

Betsill

et al. 2005

N American J Aquac

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Short-term exposures to elevated temperatures reduce germ cell numbers in the gonads of some fishes, suggesting that heat treatment may be a viable method for delaying or suppressing reproductive development in cultured fishes. The objective of this study was to determine the effects of high temperatures on early gonadal development in channel catfish Ictalurus punctatus. Twenty-three-day-old (after hatching) channel catfish were exposed to temperatures of 27ЊC (control), 34ЊC, and 36ЊC for 4 weeks. Groups of 250 fry were placed in individual 152-L glass aquaria with external biofilters, and four replicated aquaria were used per temperature treatment. Water temperature was regulated with submersible heaters. At the end of treatment, body weight and standard length were measured in 30 individuals per aquarium and gonads were examined histologically in 10 individuals of each sex per aquarium. For statistical analysis, the unit of replication was the aquarium, and differences between treatments were considered significant at ␣ Ͻ 0.05 by one-way analysis of variance (ANOVA) and Duncan's multiple-range test. Exposure to 34ЊC reduced oocyte size in ovaries and testicular size (cross-sectional area) and slightly decreased body weight but not standard length. Exposure to 36ЊC significantly reduced ovarian and testicular size, and 52% of females seemed to lack germ cells and may have been sterilized. However, exposure to 36ЊC also greatly reduced body growth and caused spinal curvatures and kidney abnormalities, suggesting that 36ЊC impairs the general health and growth of catfish fry. The results of this study are consistent with the concept that heat treatment can be used to manipulate reproductive development in channel catfish. Further research is needed to establish the appropriate combination of temperature level and treatment duration so as to reduce or eliminate germ cells without adversely affecting somatic growth during the period of treatment.In the United States, the most important farmed fish is the channel catfish Ictalurus punctatus (Hargreaves 2002) and its importance in management as a game species is second only to that of largemouth bass Micropterus salmoides (Siegwarth and Johnson 1998). Commercial fish farmers depend on high fish yields to increase profits, which can offset the cost of production and make fish farming economically viable (Engle and Valderrama 2001). Public fish managers prefer larger fish for stocking in put-and-take waters (public fishing facilities) because fish size is associated with greater angler harvest and increased survivability of the fish after stocking (Shaner and Cook 1996). To meet the needs of the public, hatcheries are required to produce large quantities of fish for stocking, which can result in smaller-than-desired fish size (Engle and Valderrama 2001). Current technologies to enhance somatic growth in fishes require either

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Section: Discussionmentioning

confidence: 99%

Evaluation of Short‐Term Exposure to High Temperature as a Tool to Suppress the Reproductive Development of Channel Catfish for Aquaculture

Byerly

Fathalla²,

Betsill

et al. 2005

N American J Aquac

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“…In scrotal species, elevated testicular temperature affects spermatogenesis (Thwaites et al, 1982), sperm motility (Wetteman et al, 1976;Cameron & Blackshaw, 1980), testicular androgen biosyn¬ thesis (Wetteman & Desjardins, 1979), testicular DNA synthesis (Nishimune & Haneji, 1981) and Sertoli Cell function (Hagenas et al, 1978). Experimental cryptorchidism may cause a complete loss of fertility of spermatozoa (Igboeli & Foote, 1969;Glover et al, 1974) and damages primarily spermatocytes in rabbits (Ploen & Hakansson, 1978), rats (Kerr et al, 1979) and even in heterotherms such as the opossum, Didelphis virginiana (Scott et al, 1979). Both testicular temperature and plasma/testicular androgens are important factors in epididymal sperm storage (Foldesy & Bedford, 1982), illustrating the interdependence of temperature-susceptible processes within the testis.…”

Section: Discussionmentioning

confidence: 99%

Relationship between body and testis temperatures in the European hedgehog, Erinaceus europaeus, during hibernation and sexual reactivation

Fowler¹,

Racey²

1987

Reproduction

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Simultaneous telemetry of the body and testis temperatures of 8 hedgehogs was carried out during hibernation and during sexual reactivation in spring. Between October and January, when the testes were involuted, the body/testis temperature differential was variable, with mean daily testis temperatures up to 1 degrees C warmer than body temperatures. From mid-February onwards, when plasma testosterone approached maximal concentrations, mean testicular temperatures stabilized 1.4 +/- 0.2 degrees C below body temperatures. During spermatogenesis testicular temperature of hedgehogs was significantly lower than body temperature. Over the euthermic body temperature range of 34.7-36.2 degrees C, testicular temperatures varied from 34.0 to 34.9 degrees C. Only at body temperatures over 36.2 degrees C did testicular temperature reach 35 degrees C. During spermatogenesis hedgehog testis temperatures are similar to those of many scrotal mammals.

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“…Ito et al, 2003. Exposure to elevated temperature has been reported by many researchers (Scott et al, 1979;Pinart et al, 1999;Fat-Hallah, 2000) to cause an inhibition of testicular development. Temperature influence the physiological processes (Brett and Groves, 1979) and the growth in many fish species (Jobling 1981;Elliott, 1982;Jonassen et al, 1999).…”

Section: Sex Ratiosmentioning

confidence: 99%

Effects of Water Temperature on Sex Differentiation and Growth Parameters of the Mozambique Tilapia (Oreochromis mossambicus, Peters, 1852)

Koyakomanda¹,

Fırat²,

Suzer³

et al. 2019

Aquatic Sciences and Engineering

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In this study, the effects of water temperature on growth, survival rate, gonad development and sex ratios of Mozambique Tilapia (Oreochromis mossambicus) were studied by applying different temperature applications (28, 30, 32, 34 and 36 o C) for a single period of 40 days. At the end of the study, in the control group (28 o C), the males proportion was 47.62%. In fishes reared at 30 o C, average male ratio was found as 73.68%. The highest male proportion was obtained in the 36 o C temperature group (86.67%). Growth performances, feed utilization and gonad development were found to increase with elevating temperatures up to 34 o C unlike the survival rate which has been found to fall with higher temperatures. In this study, sex differentiation rates differed significantly between all groups (p<0.05). However, the highest male rate obtained in group A and D. As hypothesized, results suggest that fish performed better at 30-32°C than 28°C or 34-36°C water temperature and the optimum temperature for a better expression of growth parameters in Mozambique Tilapia could be 30 o C.

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Response to cryptorchidism of the testis and epididymis of the opossum (Didelphis virginiana)

Cited by 8 publications

References 12 publications

Evaluation of Short‐Term Exposure to High Temperature as a Tool to Suppress the Reproductive Development of Channel Catfish for Aquaculture

Evaluation of Short‐Term Exposure to High Temperature as a Tool to Suppress the Reproductive Development of Channel Catfish for Aquaculture

Relationship between body and testis temperatures in the European hedgehog, Erinaceus europaeus, during hibernation and sexual reactivation

Effects of Water Temperature on Sex Differentiation and Growth Parameters of the Mozambique Tilapia (Oreochromis mossambicus, Peters, 1852)

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