Comparative folliculogenesis and spermatogenesis of four teleost fish from a Reservoir in south‐eastern Brazil

Abstract

Martins, Y.S., de Moura, D.F., Santos, G.B., Rizzo, E. and Bazzoli, N. 2010. Comparative folliculogenesis and spermatogenesis of four teleost fish from a Reservoir in south-eastern Brazil. -Acta Zoologica (Stockholm). 91: 466-473.This study provides a comparative analysis of gametogenesis of neotropical teleosts Metynnis maculatus, Megalancistrus parananus, Cichla kelberi and Satanoperca pappaterra, through histological, histochemical and histometric techniques. In the ooplasm of C. kelberi and S. pappaterra conspicuous lipid vesicles were observed, which are characteristic of pelagic eggs produced by marine fishes. Perinucleolar oocytes were identified in the testis of S. pappaterra suggesting that this species is protogynous without functional hermaphroditism, an unusual pattern for neotropical fresh-water fishes. The spermatozoa of the studied species have rounded heads, a characteristic of fish that externally fertilise their eggs. The follicular (granulosa) cells of the vitellogenic oocytes from the studied species were cuboidal or columnar, however, in C. kelberi there were columnar follicular cells at the vegetal pole and cuboidal cells at the animal pole. Variations of the histochemical content were detected in the cortical alveoli and follicular cells of vitellogenic oocytes showing differences in the mechanisms to block polyspermy and egg adhesiveness. Larger oocytes were recorded in species which demonstrated parental care behaviour and smaller oocytes were noted in those species with fractioned spawning.Nilo Bazzoli, Programa de Pós-Graduação em Zoologia de Vertebrados, PUC Minas-Av. Dom José Gaspar 500-30535-610,

WITHDRAWN: Histological and ultrastructural characteristics of the testis of the invasive suckermouth sailfin catfish Pterygoplichthys disjunctivus (Siluriformes: Loricariidae) from Marikina River, Philippines

“…This is similar with as is the case with other loricariids P. maculatus, P. corruscans, L. alexandri, R. aspera and C. conirostris (Grier, 1981;Santos et al, 2001;Martins et al, 2010;Melo et al, 2011). The absence of acrosome in the P. disjunctivus spermatozoa may be compensated by the approximate diameter of the sperm with the diameter of the micropyle in mature eggs (Jamieson, 1991) as opposed to the presence of the acrosome in agnathans and acipenciformes.…”

Reproductive cycle of the Neotropical cichlid yellow peacock bass Cichla kelberi: A novel pattern of testicular development

“…The morphological characterization of C. kelberi testes as lobular type, phylogenetically corroborates with Parenti & Grier (2004) results, who propose this testicular type as a synapomorphic character present in all surviving Neoteleost, just like the results obtained for other species of the orders Perciformes, Scorpaeniformes and Synbranchiformes, which represent more derived taxa when compared to Characiformes, Cypriniformes, and Siluriformes, whose testes were classified as anastomosing tubular (Selman & Wallace, 1986 Muñoz et al, 2002;Lo Nostro et al, 2003b;Arias et al, 2004, Dadzie & Abou-Seedo, 2004Parenti & Grier, 2004;Thacker & Grier, 2005;Nobrega & Quágio-Grassiotto, 2007;Spadella et al, 2008;Matta et al, 2009;Leal et al, 2009;Martins et al, 2010;Muñoz et al, 2010).…”

Comparative morphology of the reproductive system of seven species of ostariophysan fishes from the upper Das Velhas River, Brazil

“…The study of the chemical components can also assist in the understanding of fertilization and early embryonic development of fish species (Hart, 1990). The morphological, histochemical, and morphometric variations found in the cortical alveoli of the analyzed species may be associated with different polyspermy blocking mechanisms, as reported in other ostariophysan species (Martins et al, 2010).…”