teleost

The high levels of GH mRNA found during the late stages of the gonadal cycle validate the concept that GH participates in several teleosts reproduction [57-59].

In a review, Parenti and Grier (2004) observed an evolutionary net on the teleosts testis morphology, through the organization of the seminiferous tubules and the distribution of spermatogonia throughout the germinal epithelium.

Teleosts are well adapted for ion exchange using active and passive mechanisms across various surface membranes to keep the osmotic pressure of their body fluids steady when they face relatively hyperosmotic or hypoosmotic environment [39].

The morphology and distribution of the different cell types of the gill epithelium of teleosts have been intensively investigated in order to understand and recognize the integration of several of their functions (Wilson & Laurent, 2002; Diaz et al., 2010; Monteiro et al., 2010).

It is also becoming clear that novel sex-determining genes have emerged in several lineages of teleosts (Myosho et al., 2012; Kikuchi and Hamaguchi, 2013).

Chloride cells are less in number or completely absent in fresh water teleosts. Figure 7 shows gills from control group, with primary lamellae having chondrocyte skeleton and parallel thread-like secondary lamellae.

The bycatch abundance data were then separated into invertebrate and vertebrates (teleosts and elasmobranchs), because of the different methods of sampling used for each of these groups.

This volume contains 13 chapters on the phylogeny, anatomy, and physiology of ancient fishes, focusing on cyclostomes, chondrosteans, and holosteans, including eel, lungfishes, teleosts, garfishes, hagfish, and sturgeon.

The ovarian pattern described for the genus Leporinus is similar to most of the freshwater teleosts fishes despite of small variations that could be observed in the volume, thickness and coloration in different stages of the reproductive ovarian cycle (FERREIRA & GODINHO, 1990; BENJAMIN, 1996; KOBELKOWSKY, 2012).

The ovary, folliculogenesis and oogenesis in teleosts. In: Jamieson, B.

93-108) provide a comparative view of aquaporin biology in the male reproductive tissues of mammals and teleosts. Although detailed studies in teleosts have only been carried out in one marine species so far, data suggest that both mammalian and teleost aquaporins may play similar roles in regulating osmosis-induced volume changes and the passage of metabolites such as glycerol during germ cell development and the maturation and activation of spermatozoa.

Sperm motility time in the present study (Figure 2), in control as well as in hyposmotic media, was typical from freshwater teleosts, with approximately 30-40s of activity in freshwater and up to 200s in brackishwater.