Histología y ultra estructura del testículo del charal Chirostoma jordani (Osteichthyes: Atherinidae)
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Cárdenas Reygadas, Rodolfo
Barrera Escorcia, Héctor
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Universidad de Costa Rica
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Las características histológicas de la gónada y la gametogénesis en peces endémicos mexicanos han sido poco estudiadas y por lo tanto poco comprendidas. En el presente trabajo se describe la histología del testículo del charal Chirostoma jordani, y la ultraestructura de las células del linaje gamético por medio de microscopía fotónica y electrónica. Se recolectaron 60 peces en Corrales. estado de Hidalgo, México, 70 km al Noroeste de la ciudad de México. Los testículos del chacal Ch. jordani son órganos pares, pegados a la pared en la región laterodorsal del abdomen. Se encuentran recubiertos por un mesorquio, el cual presenta algunos puntos de pigmentación. El testículo es de tipos iubular, enc.o ntrándose las espermatogonias restringidas a los extremos distales del túbul.o fundamentalmente en la región cortical. Se registraron los tamaños de espermatogonias (8.0 ± 0.7J.1m), espermatocitos primarios ( 6.2 ± 0.3 J.lm), espertnatocitos secundarios ( 4.4 ± 0.1 J.lm), espermátides (2.5 ± 0.2 J.lm) y espermatozoides (15.4 ± 0.3 J.lm). Las células de Sertolí también se encuentran presentes rodeando a las células gametogénicas formando nidos en los cuales, las células del linaje gamético que se encuentran en su interior, tienen aproximadamente el mismo grado de desarrollo. El testículo presenta todas las células del linaje garnético al mismo tiempo, y bien desarrolladas células de Leydig, estas últimas fundamentalmente en la parte central del órgano.
Histological characteristics and garuetogenesis have received Iittle attention in endemic Mexican fish, thus they are little understood. In this study, the histology of the testis'of charal Chirosloma jordani, and ultrastruclure of gamete cells through fotonic and electron microscopy are described. Sixty male fish were collected in Corrales, Hidalgo state, México, 70 km NW México city. Charal testis are paíred, and added to the dorsolateral wall of abdomen. They are covered by a mesorquium, which has small black pigmentation spots. Testes are tubular, and spermatogonia are restricted lo Ihe distal part of tubules, basically in the cortical region. Cell sizes were measured: spermatogonia (8 ± 0.7 J-Im), primary spermatocytes (6.2 ± 0.3 11m), secondary spermatocytes (4.4 ± 0.1 *m), spermatids (2.5 ± 0.2 J-Im) and sperrnatozoa (15.4 ± 0.3 11m). Sertoli cells surround gamete cells; together they form cysts which have approximately the sarue degree of development. AH the testes have gamete cells simultaneously, and Leydig cells are easy lo see in the central patt of the testis.
Histological characteristics and garuetogenesis have received Iittle attention in endemic Mexican fish, thus they are little understood. In this study, the histology of the testis'of charal Chirosloma jordani, and ultrastruclure of gamete cells through fotonic and electron microscopy are described. Sixty male fish were collected in Corrales, Hidalgo state, México, 70 km NW México city. Charal testis are paíred, and added to the dorsolateral wall of abdomen. They are covered by a mesorquium, which has small black pigmentation spots. Testes are tubular, and spermatogonia are restricted lo Ihe distal part of tubules, basically in the cortical region. Cell sizes were measured: spermatogonia (8 ± 0.7 J-Im), primary spermatocytes (6.2 ± 0.3 11m), secondary spermatocytes (4.4 ± 0.1 *m), spermatids (2.5 ± 0.2 J-Im) and sperrnatozoa (15.4 ± 0.3 11m). Sertoli cells surround gamete cells; together they form cysts which have approximately the sarue degree of development. AH the testes have gamete cells simultaneously, and Leydig cells are easy lo see in the central patt of the testis.
Keywords
chirostomajordani, atherinidae, testis, spermatogenesis, leydig cells