Banca de DEFESA: MARCOS CÉSAR NOUALS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARCOS CÉSAR NOUALS
DATE: 10/08/2020
TIME: 14:00
LOCAL: Web Conferência via Google Meet - meet.google.com/kjc-jaxq-uxy.
TITLE:

Performance evaluation of Nile tilapia fingerlings submitted to different types of food (food storage and delivery times) during the circadian cycle.

KEY WORDS:

1. Oreochromis niloticus; 2. food management; 3. circadian cycle; 4. Zootechnical Performance.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

This work evaluated the zootechnical performance, nutrient retention and body indexes in Nile tilapia (Oreochromis niloticus), submitted to different feeding managements (times and amounts of food provided). The experiment was carried out at the Center for Aquaculture and Fishing Development (CEDAP) at the Itajaí Fish Farming Unit, located at the Itajaí Experimental Station, lasting 40 days, in 2019. 360 Nile tilapia fingerlings were used. , with an average initial weight of 23.38 ± 0.24 g, distributed in 18 experimental 1.0 m³ (1.0 mx 1.0 mx 1.0 m) volumetric capacity net cages, installed in a 300-foot pond m² with aerator. The design was a two-factorial (2 times vs 3 ways of offering) randomized blocks with three replications, totaling 6 treatments. All treatments received the same daily amount of diet, changing only the time and feeding rates at each meal. Treatments are: T1 = fish fed at 08:00, 11:00, 14:00 and 17:00 hours, with feed rates equal to 25%; T2 = fish fed at 08:00, 11:00, 14:00 and 17:00 hours, with feed rates of 10, 20, 30 and 40%; T3 = fish fed at times 08:00, 11:00, 14:00 and 17:00 hours, with feed rates 10, 40, 40 and 10%; T4 = fish fed at 11:00, 14:00, 17:00 and 20:00 hours, with feed rates equal to 25%; T5 = fish fed at 11:00, 14:00, 17:00 and 20:00 hours, with increasing portions of 10, 20, 30 and 40%; T6 = treatment 6, fish fed at 11:00, 14:00, 17:00 and 20:00 hours, with feed rates of 10, 40, 40 and 10%. Dissolved oxygen and water temperature were monitored daily. Ammonia, nitrite, pH, transparency, alkalinity and hardness, as well as biometrics to monitor the growth of animals and adjustment of the amount of feed were performed weekly. Data were subjected to Levene analysis to verify homoscedasticity. Subsequently, they were submitted to two-factor analysis (2X3). All analyzes were performed with a significance level of 5%. After 40 days, the fish remained fasting for 24 hours and all were weighed and measured to assess final weight., daily weight gain, feed efficiency, survival and productivity, which averaged 127.25 ± 4.46 g, 2, 60 ± 011 g.day -1, 1.05 ± 0.03, 99.72 ± 0.48% and 2537.93 ± 99.73 gm-³, respectively. In addition, four fish per experimental unit (72 in total) were anesthetized with clove oil (50 mg.L-1) until cercular movements ceased for later brain euthanasia and visceral fat index assessment of 1.96 ± 0. , 19% and sample collection for analysis of nitrogen retention and excretion, in the values of 54.15 ± 2.90% and 24.66 ± 2.17 kg.ton of fish-1, respectively. There was no significant difference between treatments for any of the factors analyzed. It was concluded that under the experimental conditions evaluated the time and the different distributions of the amount of food per food does not interfere with the productive and body indices, as well as the nitrogen retention capacity of tilapia juveniles subjected to the same water quality parameters.

BANKING MEMBERS:
Externo à Instituição - GABRIEL FERNANDES ALVES JESUS
Presidente - 1830781 - ADOLFO JATOBA MEDEIROS BEZERRA
Externo ao Programa - 1160184 - MAURICIO LENHMANN