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Comparative morphology of the gonadal structure related to reproductive strategies in six species of neotropical catfishes (Teleostei: Siluriformes)
- Source :
- Journal of Morphology. 272:525-535
- Publication Year :
- 2011
- Publisher :
- Wiley, 2011.
-
Abstract
- We studied the relationship between the morphology of the reproductive system and the reproductive strategies of six neotropical catfishes using macroscopic and microscopic analyses. The reproductive system of the examined Siluriformes showed diversified characteristics, but permitted their being grouped according to three reproductive strategies: pelagic spawning, demersal spawning, and internally fertilizing. The pelagic spawners Pseudoplatystoma corruscans and Conorhynchos conirostris have testes that are characterized by filiform lobes, absence of testicular secretion, full-grown oocytes of small diameter, thin zona radiata, and cuboidal follicular cells. Pimelodus maculatus is morphologically distinct from the other two pelagic spawners catfishes due to the presence of testicular secretion. The demersal spawners Lophiosilurus alexandri and Rhinelepis aspera possess homogeneous testicular secretion, large mature oocytes, and columnar follicular cells. The most specialized reproductive system was observed in the internally fertilizing Trachelyopterus galeatus, which possesses a seminal vesicle accessory to the testes, spermatozoa with elongated nuclei that form spermatozeugmata, and a secretory ovarian lamellar epithelium that is associated with sperm storage. The reproductive system observed in Neotropical catfishes showed a relationship associated with the type of fertilization and the reproductive strategies of the six species studied.
- Subjects :
- Male
endocrine system
media_common.quotation_subject
Pseudoplatystoma corruscans
Lophiosilurus alexandri
Zoology
Testis
Animals
Conorhynchos conirostris
Reproductive system
Catfishes
media_common
Teleostei
biology
urogenital system
Ecology
Reproduction
Ovary
Rhinelepis aspera
Seminal Vesicles
biology.organism_classification
Spermatozoa
Sperm
Oocytes
Female
Animal Science and Zoology
Developmental Biology
Subjects
Details
- ISSN :
- 03622525
- Volume :
- 272
- Database :
- OpenAIRE
- Journal :
- Journal of Morphology
- Accession number :
- edsair.doi.dedup.....b830e786963c0e69164a82161fe1d05d