Banca de QUALIFICAÇÃO: JEANE CAMPOS SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JEANE CAMPOS SILVA
DATA : 27/09/2021
HORA: 14:00
LOCAL: https://meet.google.com/qfq-dvhm-cse
TÍTULO:

Pelagic larval growth and duration of Lutjanidae species in Abrolhos Bank Reefs

PALAVRAS-CHAVES:

Otholith microstructure; otolith daily growth increments; fish larval growth

PÁGINAS: 20
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Early growth rates of fish are mainly influenced by water temperature and food intake. Pre-settlement growth rates regulate the time taken by individual fish to develop and acquire capabilities to survive in the reef environment. Pelagic larval duration (PLD) can extend from days to many months and has been considered a predictor of fish dispersal potential because older pre-settlement individuals exhibit more time to disperse. Age and daily growth are recorded through increment deposition in fish otoliths. These calcified structures have been an important tool in species differentiation, age determination, and in studies of growth models and evaluation of fish migration patterns in different environments. The objective of this research is to describe for the first time the growth rates and pelagic larval duration of Lutjanus analis, L. jocu, and L. synagris, three species of lutjanidae in the Abrolhos bank reefs. The capture of post-larvae was done with light traps of the CARE® type. In the Marine Ecology and Conservation laboratory the samples were measured, weighed and identified. Initially, 141 larvae were identified and dissected to remove the pair of lapillus otoliths, of these, 117 had their otoliths embedded in transparent epoxy resin for thinning. After the thinning procedure, 73 viable otoliths were verified to estimate the age, being 30 from L. jocu, 16 from L. analis and 27 from L. synagris. It was observed that of the three species used, L. analis showed greater loss of otoliths due to their fragility, which were broken when handling individuals to remove otoliths. Viable otoliths were photographed using a stereoscopic microscope with transmitted and polarized light (100x and 400x magnification) coupled to a camera (Motic) with Motic 3.1 software for age estimation with counting of growth increments. To ensure accuracy in age estimation, a visual count of daily increments was performed under an optical microscope and then three independent readings were performed, along a consistent reading axis perpendicular to the longest axis of otolith growth, through the analysis of photos from cross sections of the lapilli otolith. Subsequently, these data will be analyzed and the results shown through graphs and tables.

MEMBROS DA BANCA:
Presidente - 1147286 - FABIANA CEZAR FELIX HACKRADT
Interno - 1041340 - LEONARDO EVANGELISTA MORAES
Externo ao Programa - 3078469 - IGOR EMILIANO GOMES PINHEIRO
Externa à Instituição - TULIA ISABEL MARTINEZ AGUILAR