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Reproductive biology of the Neotropical catfish Iheringichthys labrosus (Siluriformes: Pimelodidae), with anatomical and morphometric analysis of gonadal tissues

dos Santos, JE; Marcon, L; Brito, MFG; Guimaraes Sales, N; Rizzo, E; Bazzoli, N

Authors

JE dos Santos

L Marcon

MFG Brito

E Rizzo

N Bazzoli



Abstract

The reproduction of Iheringichthys labrosus (Lütken, 1874) from the Turvo River, Brazil, was studied using anatomical, biometric, histological, and ultrastructural techniques. Between April 2014 and March 2015, a total of 278 males and 512 females were captured bimonthly. The testes of Iheringichthys labrosus are fringed and possess a cranial spermatogenic region and an exclusively secretory caudal region. Histologically, the cranial region is composed of seminiferous tubules with spermatogenesis being completed in cysts. The spermatozoa are of the primitive type with a spherical head and have a rudimentary intermediate piece and a long tail with an axonemic arrangement of 9 + 2. The caudal region does not form an individualized gland, and cells in this testis area have characteristics of protein secretion. A variable density electron-dense secretion accumulates in the cisternae of the rough endoplasmic reticulum in the lumen of the seminiferous tubules and in the testicular ducts during maturation. The cortical alveoli are discontinuous, and the zona pellucida consists of three layers crossed by pore canals, and the follicular cells are squamous in the early stages of oogenesis and cuboidal in advanced stages. The gonadosomatic index was associated with the maturation of the gonads while the condition factor indicated that the fish feed less and utilize adipose reserves during the reproductive period. Males and females reproductively functional throughout the year with spawning being partial or multiple, similar to that reported in studies of the species in lentic environments.

Citation

dos Santos, J., Marcon, L., Brito, M., Guimaraes Sales, N., Rizzo, E., & Bazzoli, N. (2019). Reproductive biology of the Neotropical catfish Iheringichthys labrosus (Siluriformes: Pimelodidae), with anatomical and morphometric analysis of gonadal tissues. Animal Reproduction Science, 209, https://doi.org/10.1016/j.anireprosci.2019.106173

Journal Article Type Article
Acceptance Date Aug 22, 2019
Online Publication Date Sep 5, 2019
Publication Date Sep 5, 2019
Deposit Date Jan 31, 2023
Journal Animal Reproduction Science
Print ISSN 0378-4320
Publisher Elsevier
Volume 209
DOI https://doi.org/10.1016/j.anireprosci.2019.106173
Publisher URL http://doi.org/10.1016/j.anireprosci.2019.106173
Additional Information Funders : Conselho Nacional de Desenvolvimento Científico e Tecnológico;Fundação de Amparo a Pesquisa do Estado de Minas Gerais