Age changes in the testis of the teleost, astyanax mexicanus

Rasquin, Priscilla; Hafter, Ethel

doi:10.1002/jmor.1050890302

Cited by 36 publications

(12 citation statements)

References 8 publications

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“…The other sig nificant age changes are a decrease in the den sity of lymphocytes and an increase in the number of reticular cells and collagenous fibres [61]. Occurrence of thymic shrinkage during maturation has also been reported for other short-lived fish species [55,62], In gen eral, such changes resemble the pattern ob served in mammals.…”

Section: Thymusmentioning

confidence: 75%

“…Like in ageing prostrate of man and other mammals, insoluble calcified concen trates were also found in the testes of old fishes. In general, the testes showed partial degeneration, yet a larger part of the gland remained functional [55], Almost similar findings were reported for mosquito fish [3], On the other hand, no significant age changes were observed in the structure of testes of R. serviceus amarus except for a slight accumula tion of connective tissue and a reduction in the germ cells in old individuals [50]. The absence of drastic degenerative changes in fish testes is comparable to the pattern ob served in mammals.…”

Section: Testismentioning

confidence: 96%

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Ageing in Fishes

1994

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Fishes show three types of senescence. Lampreys, eels and pacific salmon exhibit rapid senescence and sudden death at first spawning. The guppy, red panchax, medaka, platyfish, Indian murrel and many other teleosts undergo gradual senescence, as observed in most of the vertebrates. A number of fishes (e.g. sturgeons, paddlefish, female plaice, flatfish, rock-fish) show indeterminate growth, the occurrence of senescence in them is supposed to be very slow or negligible. Neuroendo-crine mechanisms are involved in rapid senescence. Most of the evidences in favour of the occurrence of senescence in fishes have been derived from studies in species showing gradual senescence. Age-related increases in mortality rate, accumulation of lipofuscin, lipid peroxidation, collagen cross-linking and decreases in growth rate, reproductive capacity and protein utilisation are clearly marked in such species. Anatomical changes in various organs during ageing also confirm increases in degenerative changes and pathological symptoms. Dietary restriction and lower environmental temperature retard the ageing processes in a few species showing gradual senescence. These results tentatively support the contention of commonality in mechanism of ageing processes in vertebrates. At present, anatomical, cellular, biochemical and genetic evidences in support or against the occurrence of slow senescence or negligible senescence in long-lived fish species are almost nonexistent. Extensive studies on ageing in fishes are needed to explain the multiple mechanisms which are not unexpected considering the number and variety of the existing species.

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Section: Thymusmentioning

confidence: 75%

Section: Testismentioning

confidence: 96%

Ageing in Fishes

1994

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“…Rai [1965] observed vacuol ization and disintegration of interstitial cells and lobule boundary cellsduringthe spawning phase of B. tor. On the other hand, Van Oordt [1925], Matthews [1938], Rasquin and Hafter [1951] and Barr [1963] could not find any glandular activity of these cells. In G. gotyla, both the interstitial and lobule boundary cells were observed but their secretory nature could not be ascertained.…”

Section: Discussionmentioning

confidence: 99%

Seasonal changes in the testes of a hill stream teleost, <i>Garra gotyla</i> (Gray)

Shrestha¹,

Khanna²

1978

Cells Tissues Organs

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The cephalic, middle and posterior regions of the testes in Garra gotyla are identical in structure and function. The spermatogenetic activity starts in the month of October reaching its peak in April and May. Spawning takes place in June and July followed by a brief resting period. Spermiation appears to be intermittent. Six stages of spermatogenesis have been described. New crop of germ cells appears to arise from the resting spermatogonia. Both the interstitial and the lobule boundary cells were observed. The gonosomatic index shows correlation between the rise in water temperature and the volume of the testes.

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“…James [1946, Rasquin and Hafter [1951], Gokhale [1957], Lofts and Marshai.i. [1957], Swarup [1958], Satiiyanf;san [1959], Henderson [1962], Rai |1965|).…”

Section: Introductionmentioning

confidence: 99%

The annual cycle in the testis of the catfish

Lehri¹

1967

Cells Tissues Organs

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Age changes in the testis of the teleost, astyanax mexicanus

Cited by 36 publications

References 8 publications

Ageing in Fishes

Ageing in Fishes

Seasonal changes in the testes of a hill stream teleost, <i>Garra gotyla</i> (Gray)

The annual cycle in the testis of the catfish

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