Hystological analysis of ovarian development of the characiform Oligosarcus hepsetus (Cuvier, 1829) in a Brazilizn Reservoir

Abstract

A histological analysis was performed of the ovarian development of Oligosarcus hepsetus (Cuvier, 1829), a medium-sized carnivorous Characiform species in the Lajes reservoir, Brazil. A total of 125 fishes, collected monthly between April 2001 and June 2002 were examined by routine macroscopic and histological techniques. Eight phases of the oocyte development were described, and 4 stages and 4 substages of gonadal development were proposed. Spawning in reservoirs, similarly to that in rivers, is in batches, which favors juvenile survival and suggests that the impoundment of this area did not influence the reproductive strategy of this very successful species in a dammed environment.

Analyses of the development and glycoproteins present in the ovarian follicles of Poecilia vivipara (Cyprinodontiformes, Poeciliidae)

“…Several studies have shown differences between the ovarian classification of fish with external fertilization, such as Symphysodon discus (Heckel 1840), Oligosarcus hepsetus (Cuvier 1829), and Iheringichthys labrosus (Lütken 1874) (Chellappa et al 2005, Santos et al 2005, and those presenting internal fertilization, such as P. vivipara. This finding was confirmed in the present study, since the observation of embryos and larvae at different stages of development in this fish species was an important factor in our analysis due to the occurrence of additional stages of ovarian maturation.…”

“…Females are good indicators of the spawning season, since new individuals depend on the quantity and quality of oocytes because the production of spermatozoa is generally high and oocytes determine the synthesis and storage of the nutrients that are necessary for embryo development, such as vitellogenin (Santos et al 2005). Vitellogenesis promotes the accumulation of yolk protein, which accounts for 80-90% of the ovary weight, and contributes to oocyte growth (Selman & Wallace 1989).…”

Patterns of energy allocation to reproduction in three Amazonian fish species

“…Only female specimens were used for this study as their gonadal stages were readily recognized. Development stages of gonads were determined based on the degree of vascularization, the percentage of the abdominal cavity occupied by ovaries, and presence, size and colour of oocytes (Vazzoler, 1996;Mazzoni & Iglesias-Rios, 2002;Santos et al, 2005). The following classification was used: immature, maturing, ripe, and spawned/recovering.…”

Ovary maturation stages histology and follicles diameter of Melanotaenia boesemani rainbowfish ovary from district of North Ayamaru, Maybrat Regency, west Papua

“…This finding was appropriated with the study in Melanorivulus aff. punctatus ovaries (CASSEL, MEHANNA, MATEUS et al, 2013) and Oligosarcus hepsetus (SANTOS, ANDRADE, SANTOS et al, 2005) which stated that atresia follicles found in every stages of ovary maturation. The proportion of atresia follicles were fewer at previtellogenic phase and found more frequent at vitellogenic phase also can be found in ovaries of Carassius auratus dan Oncorhynchus mykiss.…”

“…Evaluation using both methods give the best description for development of the ovaries (MUCHLISIN, 2014). Analysis of morphological development of the ovaries is often different with histological analysis because ovarian development can not be described accurately (EL-HALFAWY, RAMADAN and MAHMOUD, 2007;FERREIRA, SANTOS, REIS-HENRIQUES et al, 2012;SANTOS, ANDRADE, SANTOS et al, 2005;JAYASANKAR and ALAGARSWAMI, 1994). Ovari maturation stages is related with oogenesis.…”