Lipid metabolism of rays Potamotrygon falkneri during reproduction

• Grant number: 16/11736-6
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2016
• End date: August 31, 2017
• Field of knowledge: Biological Sciences - Physiology - Compared Physiology
• Principal Investigator: Cristiéle da Silva Ribeiro
• Grantee: Lucas Spada
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

Stingrays of Myliobatiformes Order are considered histotrophic viviparous, due to the fact that embryos are nurtured by secretion of villiform mucous produced by the mother uterus, known as trophonema, which is rich in lipids ("uterine milk") and proteins of high molecular weight. It is well known and studied that, during the reproductive cycle of fish, under the hormone regulation of the hypothalamus-pituitary-gonads axis, metabolic reserves are reorganized, with actual changes in muscle composition, adiposity tissue and liver, which has its reservations reduced and mobilized to the gonads, especially in females, who have hepatic metabolism stimulated during the vitelogenesis process. Seasonal changes in body composition (water, lipids and proteins storage) has been observed in various species of fish, and these changes seem to be related to the growth and development of the gonads, and other processes associated with spawning. In the case of rays certainly metabolic distribution and commitment to energy reserves for reproduction extend to post-vitellogenic periods since reproductive success of these species will depend on the development of trophonema and uterine milk, which will serve as a nutritional basis for the embryos to the time of birth. In this way it is important to understand the physiological processes related to reproductive dynamics, physiological adaptations associated with maternal and fetal trophic relationship and the allocation of distinct patterns of lipid classes during pregnancy, which can reflect nutritional and environmental characteristics in the elected species.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE SOUSA RANGEL, BIANCA; DE CASTRO RIBEIRO, DOUGLAS; CHAGAS, JUMMA M. A.; SPADA, LUCAS; MOREIRA, RENATA G.; DA SILVA RIBEIRO, CRISTIELE. Effects of biological traits on capture-induced parturition in a freshwater stingray and perspectives for species management. Journal of Fish Biology, v. 97, n. 2, JUL 2020. (17/25273-0, 14/16320-7, 16/11736-6)

PAGLIARINI, CIBELE DIOGO; RIBEIRO, CRISTIELE DA SILVA; SPADA, LUCAS; DELARIVA, ROSILENE LUCIANA; ARAUJO CHAGAS, JUMMA MIRANDA; DOS ANJOS, LUCIANO ALVES; RAMOS, IGOR PAIVA. Trophic ecology and metabolism of two species of nonnative freshwater stingray (Chondrichthyes: Potamotrygonidae). Hydrobiologia, v. 847, n. 13, MAY 2020. (16/11736-6, 15/21936-0)