Banca de QUALIFICAÇÃO: SILAS DA SILVA GUIMARÃES JUNIOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : SILAS DA SILVA GUIMARÃES JUNIOR
DATE: 28/03/2024
TIME: 09:00
LOCAL: Remoto - meet.google.com/xtm-uxzg-cmn
TITLE:

Larval survival of the freshwater shrimp Macrobrachium olfersii (Caridea: Palaemonidae) in different salinity concentrations

KEY WORDS:

Larviculture. Native Species. Latin America. Open System

PAGES: 51
BIG AREA: Ciências Agrárias
AREA: Recursos Pesqueiros e Engenharia de Pesca
SUBÁREA: Aqüicultura
SPECIALTY: Carcinocultura
SUMMARY:

One of the main sectors of production in aquaculture is shrimp farming, with shrimp growing reaching production values estimated at 11.2 million tons in 2020. The species Litopenaeus vannamei and Macrobrachium rosenbergii are among the most cultivated species globally in marine and freshwater shrimp farming, respectively. Although not listed among the native Brazilian species with aquaculture potential, M. olfersii, is a species with wide distribution in the Brazilian territory and great ecological role. Species exploited as a fishing resource are subject to a decline in their populations and in recent decades the contamination and destruction of habitats increased the need for technologies that can contribute to a socioeconomic production of species of commercial interest and even for conservation purposes. Therefore, the objective of the research is to use the species M. olfersii as a model to understand the effect of different levels of salinity on their larval survival. Ovigerous females of M. olfersii were collected in the city of Itacaré, Bahia. To quantify the larval survival of M. olfersii in relation to salinity, two experiments were performed. The first experiment evaluated the larval survival of the species after hatching during the acclimatization phase. The second experiment used larvae after acclimatization period to evaluate survival over days. In the first experiment, after the 4-hour acclimatization period, the survival of M. olfersii larvae was higher than 85% and did not show significant difference between treatments (0, 6, 11, 14, 20 and 24 g/L). For the second experiment, the survival of M. olfersii larvae showed no significant difference between salinity concentrations 0, 6, 12, 16, 22 and 28 g/L tested in the present study, however, the days of cultivation significantly affected larval survival. The data obtained in this study indicate that larvae of M. olfersii, born in freshwater, have a good survival rate (>85%) in a process of a gradual transition to brackish water. The larviculture of the species had a high mortality and it was not possible to follow the complete larval development. In addition to salinity, other factors such as type of management and water used may be associated with the survival of the species in this study.

COMMITTEE MEMBERS:
Presidente - 1217728 - FABRICIO LOPES DE CARVALHO
Interno - 1956163 - NADSON RESSYE SIMOES DA SILVA
Externa à Instituição - MARIANA LINS RODRIGUES
Externo à Instituição - CÉSAR ANTUNES ROCHA NUNES
Externa à Instituição - GISELE DAIANE PINHA
Externo à Instituição - RAFAEL DE CARVALHO SANTOS