Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)
Abstract
In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36) were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI) was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs) were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.
Keywords
chemistry
Zoology
Pharmacy and materia medica
Biology (General)
Medicine
Chemical technology
Engineering (General). Civil engineering (General)
Technology
physics
environmental sciences
neurology. diseases of the nervous system
medical physics. medical radiology. nuclear medicine
neoplasms. tumors. oncology. including cancer and carcinogens
water supply for domestic and industrial purposes
sewage collection and disposal systems. sewerage
law
political science
political institutions and public administration (general)
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49434
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