Banca de DEFESA: NATHIELLY LIMA DO REGO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : NATHIELLY LIMA DO REGO
DATE: 30/08/2021
TIME: 08:00
LOCAL: https://meet.google.com/mta-ziwm-zxe
TITLE:

Generalized additive models for location, scale and shape in the length structure analysis of Manjuba (Opisthonema oglinum) captured in the Santa Cruz Channel-PE

KEY WORDS:

 Opisthonema oglinum. Santa Cruz Channel. GAMLSS.

PAGES: 71
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUMMARY:

Manjuba (Opisthonema oglinum) is the most common sardine in Santa Cruz Channel’s
(CSC) landings, located on the northern coast of Pernambuco state. The species is classified
as visiting marine origin, as it spends part of its life cycle at the sea and enters estuaries
at strategic times. The initial research’s issue focuses on speculating some hypotheses
related to the juveniles’ over-catching from O. oglinum species, that are relevant to fisheries
professionals on decision-making. The high exploitation of the species and its importance
to the economy in the municipalities surrounding the CSC led us to reflect on the need
for investigations to promote the sustainable fishing of O. oglinum and, consequently,
expand the understanding of the species in the CSC, once the comprehension of the length
structure in catches is valid not only to expand knowledge but also to raise hypotheses about
the fishing pressure on the resource. The investigation was performed by estimating the
standard length of the specimens, using generalized linear models (GLM) and generalized
additive models for location, scale, and shape (GAMLSS). After performing the modeling,
we observed that the models estimated via GAMLSS enabled a better fit to describe the
standard length of O. oglinum compared to those obtained via GLM, according to the
GAIC criterion and residue analysis. The Box Cox t Original distribution was chosen to
adjust the response variable with the modeling of position and scale parameters. Therefore,
we realized the existence of seasonality in the standard length of O. oglinum captured
in the Santa Cruz Channel, with the presence of larger individuals in the rainy season,
and greater concentration in the center-south region of the channel. On the other hand,
the smaller sardines were concentrated near the outflow of the Botafogo River, an area
of secondary channels with greater mangrove coverage. We have found evidence that few
adults enter the channel and the vast majority of specimens captured in the CSC were
young. Thus, it would be pertinent to explore specimens that have completed at least the
sexual maturity, since the capture of young individuals can cause an imbalance in the
sustainability of the species.

BANKING MEMBERS:
Presidente - 2508764 - PAULO JOSE DUARTE NETO
Interno - 2883259 - KLEBER NAPOLEAO NUNES DE OLIVEIRA BARROS
Externo ao Programa - 1740405 - FRANCISCO MARCANTE SANTANA DA SILVA