Estrutura morfológica do fígado de tambaqui Colossoma macropomum (Cuvier, 1818)

Abstract

Pesq. Vet. Bras. 32(9) This research aimed to describe the macroscopic and microscopic liver of tambaqui, Colossoma macropomum, Teleost freshwater Family Characidae, of great economic interest for the Amazon basin. We used six juveniles aged between six month and one year, from the small holding Esteio, Alta Floresta/MT, that develops mainly ϐish farming. The body was photographed in situ, described macroscopically, and fragments were removed and processed by routine histological techniques through parafϐin embedding and HE staining. The liver, located ventrally to the swim bladder and craniodorsally to the stomach, is brownish red and consisted of three lobes, the right lateral, the left lateral and the ventral lobe. Microscopically, the parenchyma consists of hepatocytes varying from irregular rounded hexagonal to round forms with a large and central nucleus, and arranged in linear strings limited by sinusoids and radiating to central veins, but with absence of liver lobules. The central veins are distributed throughout the parenchyma, while the portal space consists in most cases only of a hepatic vein and bile duct; elsewhere exist artery and duct. Formation of portal triads was not founde. Melano macrophages were frequently seen dispersed throughout the central parenchyma. The morphofunctional study of the digestive system of ϐishes of the Amazon basin is important to obtain knowledge about their weight gain, large scale production for human consumption and preservation of the species, and has also its importance for being used as bioindicators today. dae, de grande interesse econômico da bacia Amazônica. Foram utilizados seis (6) exemplares jovens com idade entre seis meses e um ano, oriundos da Chácara Esteio, Alta Floresta, MT, que desenvolve principalmente a prática da piscicultura. O órgão foi fotodocumentado in situ e descrito macroscopicamente, em seguida procedeu-se a retirada de fragmentos deste, que foram processados pelas técnicas histológicas rotineiras para inclusão em paraϐina e coloração de HE. O ϐígado localizou-se ventral à bexiga natatória e craniodorsalmente ao estômago, apresentou coloração amarronzada a vermelho, constituído por três lobos hepá-ticos, o lobo lateral direito, o lobo lateral esquerdo e o lobo ventral. Microscopicamente, o parênquima era constituído por hepatócitos com formato que variou do arredondado irregular hexagonal ao redondo com núcleo grande e central, arranjados em cordões lineares limitados por sinusóides que irradiam para veias centrais, e com ausência de lóbu-

Macro- and microstructural descriptions of the zebrafish (Danio rerio) liver

“…The macroscopic and microscopic findings observed in zebrafish liver were similar to those found in other teleosts [1,2,4]. The liver location in the medial portion of the coelomic cavity, its size and shape were due to an adjustment to the space occupied by other organs during the embryonic development [2].…”

“…The liver location in the medial portion of the coelomic cavity, its size and shape were due to an adjustment to the space occupied by other organs during the embryonic development [2]. Moreover, the brownish colour resulted from the rich vasculature of the organ.…”

“…The liver is located in the coelomic cavity and is made up of hepatocytes, cells with high potential mitotic whose function is synthesis, secretion, storage, biotransformation, and metabolism [2].…”

Liver histology and histomorphometry in hybrid sorubim (Pseudoplatystoma reticulatum × Pseudoplatystoma corruscans ) reared on intensive fish farming

“…; Costa et al . ; Dabrowska, Ostaszewska, Kamaszewski, Antoniak, Napora‐Rutkowski, Kopko, Lang, Fricke & Lehtonen ). This structure was classified as a venous type according Akiyoshi & Inoue (), which is devoid of peripheral vessels.…”

“…In many fish species, the histological and histometric details of hepatic structures are well known (Hinton, Hampton & Lantz ; Rocha, Monteiro & Pereira ). For Brazilian fish, the studies have been limited to qualitative morphological description (Vicentini, Franceschini‐Vicentini, Bombonato, Bertolucci, Lima & Santos ; Bombonato, Rochel, Vicentini & Vicentini ; Costa, Ortis, Lima, Casals, Lima & Kfoury ) although some have investigated the histometric measurements and the effects of nutritional supplements, food additives and pollutants on the hepatic histology (Padua, Urbinati, Nakaghi, Carneiro & Malheiros ; Honorato, Ushizima, Quintana, Campos, Marcondes, Nascimento & Santamaria ; Pereira, Alves, Alves, Senhorini, Rocha, Scalize, Pitol & Caetano ).…”