The annual cycle in the testis of the catfish

Lehri, G.K.

doi:10.1159/000142974

Cited by 21 publications

(10 citation statements)

References 10 publications

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“…As in Clarias batrachus (Lehri, 1967(Lehri, , 1968 and in Heteropneustes fossilis (Sundararaj and Vasal, 1976), spermatogenesis and vitellogenesis in feral Clarias gariepinus are resumed in late winter and early spring, when the water temperatures are relatively low, but increasing daily. During that time of year Viveen (unpublished results) observed sunbathing of catfish in very shallow and warm (28°C) water of the Hula Nature Reserve at midday.…”

Section: Discussionmentioning

confidence: 99%

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

et al. 1987

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Section: Discussionmentioning

confidence: 99%

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

et al. 1987

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“…Sathyanesan [1959], Rai [1965] and Nair [ 1966] reported the posterior region of testes ex amined by them to the sterile in nature and serving for storage and conduction of sper matic fluid. Lehri [1967] noticed that the anterior and posterior region of testes in Clarias ha!rachus are structurally and func tionally similar. Klianna and Pant [1966] also found the anterior, middle and posterior regions of the testes of G. pectinoptenis equally fertile.…”

Section: Discussionmentioning

confidence: 99%

“…Ac cording to some, germ cells arise from a permanent extratesticular source and migrate annually into the testis [Loft and Marshall, 1957;Geoffery andGeoffery, 1966;Shrivastava, 1967;Rastogi, 1968], According to others, the reserve stock of germ cells present throughout the year gives rise to the next crop of sperma togonia without migration [Van Oordl, 1925;Stenger, 1959;Sathyanesan, 1959;Henderson, 1962;Rai, 1965;Khanna and Pam, 1966;Lehri, 1967;Dadzie, 1969;Sanwaland Khanna, 1972], The present study on G. gotyla supports the hypothesis that the testis contains an un differentiated permanent stock of germ cells or resting spermatogonia which undergo mitotic division and give rise to various stages of spermatogenesis, while a few serve as reserve stock for the following season.…”

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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“…Therefore, FISHELSON et al (1994) demonstrated, through ontogenesis of seminal vesicles of Clarias gariepinus (Burchell, 1822) that they are formed in the beginning of spermatogenesis, as a simple protrusion on the wall of the spermatic duct and become complex with age. SUNDARARAJ (1958), LEHRI (1967), RASTOGI (1969), NAYYAR & SUNDARARAJ (1970), VAN DER HURK et al (1987), ASAHINA et al (1989) andLAHNSTEINER et al (1990) affirmed to the presence of the seminal vesicle in some teleosts, notably in catfishes, gobids and blenids. For the species studied in the present work, naming testes caudal fringes, as seminal vesicle is inappropriate, as according to their embryonic and ontogenic development they are not homologous to mammal's seminal vesicle.…”

Section: Testes Of Pimelodella Cristata Pimelodus Ornatusmentioning

confidence: 95%

Testicular structure of three species of neotropical freshwater pimelodids (Pisces, Pimelodidae)

Cruz

Santos

2004

Rev. Bras. Zool.

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The testes structure of the following Siluriformes was studied: Pimelodus maculatus (Lacepède, 1803), Iheringichtys labrosus (Lütken, 1874) and Conorhynchos conirostris (Valenciennes, 1840). The testes of these species were dissected into cranial and caudal regions. The fringes of mature testes were counted and measured. Student's t-test was used to identify significant differences between fringe lengths of the two regions. To study the whole testes of each species in its resting and mature stage, testes were fixed in Bouin liquid for 6-8 hours and submitted to routine histological techniques. Standard histochemical techniques were used to detect carbohydrates and proteins. The testes of all species were paired and fringed organs. Histologically, cranial fringes of all species were spermatogenic with cells inside cysts at the same phase of development. Caudal fringes of C. conirostris were spermatogenic; while P. maculatus and I. labrosus showed caudal fringes only during secretion. Histochemically, neutral glycoproteins, acid glycoconjugates, acid carboxilates, sialomucines, and acid and sulfates glycoconjugates were detected in the caudal fringe secretions of P. maculatus; and neutral glycoproteins in I. labrosus. Significant differences between the fringe lengths of the cranial and caudal regions were found for all the species studied.
Estudou-se a estrutura testicular dos seguintes peixes Siluriformes: Pimelodus maculatus (Lacepède, 1803), Iheringichtys labrosus (Lütken, 1874) e Conorhynchos conirostris (Valenciennes, 1840). Os testículos foram dissecados e divididos anatomicamente em regiões cranial e caudal. As franjas dos testículos em maturação foram contadas e mediu-se o comprimento das mesmas. O teste t de Student foi utilizado para verificar diferenças significativas entre o comprimento das franjas das duas regiões. Para estudo histológico, testículos inteiros de cada espécie, em repouso e em maturação, foram fixados em líquido de Bouin por 6-8 horas e submetidos às técnicas histológicas de rotina. Utilizaram-se técnicas histoquímicas clássicas para detectar carboidratos e proteínas. Os testículos das espécies estudadas são órgãos pares e franjados. Histologicamente, as franjas da região cranial de todas as espécies são espermatogênicas, com células da linhagem em mesma fase de desenvolvimento contidas em cistos. As franjas da região caudal de C. conirostris são também espermatogênicas, enquanto P. maculatus e I. labrosus apresentam franjas caudais exclusivamente secretoras. Histoquímicamente detectou-se na secreção das franjas caudais de P. maculatus glicoproteínas neutras, glicoconjugados ácidos carboxilados, incluindo sialomucinas e glicoconjugados ácidos e sulfatados e em I. labrosus glicoproteínas neutras. Houve diferenças significativas entre o comprimento das franjas das regiões cranial e caudal para todas as espécies estudadas

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The annual cycle in the testis of the catfish

Cited by 21 publications

References 10 publications

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

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

Testicular structure of three species of neotropical freshwater pimelodids (Pisces, Pimelodidae)

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