Título:	Feasibility of In Vivo semen collection and description of the morphology and ultrastructure of the spermatozoa of Arapaima gigas (Schinz, 1822).
Autor:	TORATI, L. S. LOPES, J. T. LIMA, A. F. PUVANENDRAN, V. BATLOUNI, S. R. KIRSCHNIK, L. N. G.
Afiliación:	LUCAS SIMON TORATI, CNPASA JULIA T. LOPES, IFTO, Pedro Afonso-TO ADRIANA FERREIRA LIMA, CNPASA VELMURUGU PUVANENDRAN, CENTER FOR MARINE AQUACULTURE & PRODUCTION BIOLOGY, Norway SERGIO R. BATLOUNI, UNESP, Jaboticabal-SP LUCIANA NAKAGHI GANECO KIRSCHNIK, CNPASA.
Año:	2024
Referencia:	Fishes, v. 9, 24, 2024.
Descripción:	The pirarucu, Arapaima gigas, is an emblematic endangered Amazon osteoglossid with high potential for aquaculture development. In this study, we report the in vivo collection of semen from pirarucu for the first-time and a complete description of the spermatozoa ultrastructure using scanning and transmission electron microscopy (SEM and TEM). The spermatozoon of pirarucu is biflagellate with no acrosomal cell, comprising a spherical head (8.26 ± 2.19 μm2), a short intermediate piece region and two long flagella (68.34 ± 5.69 μm). The nucleus is spherical and electron-dense, and at its base, there are two nuclear fossae where the centrioles are found. The anterior part of the flagellum is positioned at the lateral base of the nucleus, forming an intermediate piece. Lateral to the intermediate piece, an abundant number of mitochondria are present and occupy most of the cytoplasmic volume. The two flagella were found with a 9 + 2 axonemal structure (nine peripheral doublets and two central microtubules). The central microtubules are aligned with two side fins formed laterally by the axoneme plasma membrane. Side fins were observed from the anterior region to the posterior end. The results show that the spermatozoa of A. gigas are biflagellate, mitochondria-rich and robust, corroborating the external fertilization characteristic of the species. The novel description of sperm morphology presented herein will contribute to advancing the knowledge of and aiding future research on the reproductive biology of this species.
Thesagro:	Pirarucu Peixe Reprodução Animal Morfologia Animal Espermatozóide
NAL Thesaurus:	Spermatozoa Osteoglossidae Arapaima gigas Reproduction Ultrastructure
ISSN:	2410-3888
DOI:	https://doi.org/10.3390/fishes9010024
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CNPASA)