Morphometric and allometric growth of carp (Cyprinus carpio) genotypes

• Grant number: 20/05990-2
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2020
• End date: August 31, 2022
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Production
• Principal Investigator: Vander Bruno dos Santos
• Grantee: Lucas Rosan Furquim
• Host Institution: Instituto de Pesca. Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). São Paulo , SP, Brazil

Abstract

The objective of this study is to establish growth curves between different common carp genotypes, evaluating body morphometry and allometric relationships. The experiment will be carried out in Mundokoi farm, located in Juquitiba for 12 months. 800 fingerlings of carp selected by nishikigoi standard (body conformation and / or coloration) from two different crossings will be used. Initially, the fingerlings of approximately 10 g will be cultivated in 8 net tanks (0.6 m³), arranged parallel in a 1500 m² dam, at a density of 15 fingerlings / m³. The feed will be made with formulated extruded feed specific for each growth phase, being supplied 4 times a day, in the amount of 5 - 8% of biomass. Dissolved oxygen and temperature will be monitored weekly. The pH, ammonia, nitrite and nitrate, monthly. As the animals grow, 10 carps will be sampled from each tank on days 0, 60, 120, 240 and 360 after they have been fasted for 24 hours. The animals sampled will be weighed and measured in length, being determined the weight gain and feed conversion in each period. Growth curves will be adjusted by the Gompertz model of weight as a function of age to determine and compare growth rates and morphometric growth curves (shape x weight). Measurements will be taken as head length (CC), standard length (CP), body height (AC) and body width (LC). After fasting for 24 hours and heat shock insensitization, 5 fish will be slaughtered (anoxic), weighed and dissected. For the allometric evaluation the following fish component parts will be weighed: head, carcass, offal, liver, intestine, cellomatic fat and gonads. The study of the allometric growth of the fish parts will be performed by the exponential equation model y = axbe. The experimental design will be completely randomized in a factorial scheme, being evaluated 2 treatments in 5 periods with 4 replications (tanks). Performance and morphometric data will be subjected to analysis of variance and growth model estimates will be obtained by Weighted Least Squares. The curve parameters for each genotype will be compared by their confidence intervals at 95% probability. Equations and coefficients of determination (R²) will be provided. Absolute and relative growth rates, weight and age at inflection will also be determined. In all analyzes the significance of 5% will be adopted.