Portal de Periódicos da CAPES

PROTEIN AND ENERGY REQUIREMENTS OF STRIPED MULLET Mugil cephalus LARVAE

2000; Volume: 25; Issue: 8 Linguagem: Inglês

10.21608/jappmu.2000.259602

2090-3723

Alaa A. El-Dahhar,

Two experiments were carried out to determine protein and energy requirements of striped mullet (Mugil cephalus) larvae for maintenance and maximum growth.In experiment 1 a diet containing 38% dietary crude protein and 2.45 kcal metabolizable energy / g was fed at seven incremental rates [1-13% of body weight (BW) daily] to larvae (0.195g initial BW) for 5 wk.In experiment 2, seven isocaloric diets containing (14-38% crude protein levels) were fed at satiate rate of feeding to larvae (0.2g initial BW) for 6 wk.In experiment 1, Striped mullet BW increased linearly as feeding rate increased, up to 34.61mg protein and 345.6cal gross energy / g BW daily (r 2 = 0.99), and also as dietary crude protein increased up to 26% in experiment 2 (r 2 = 0.99).The relationships between BW gain (Y) and the increase of protein and energy intake (X), could be expressed by the equations Y = -58.06+ 16.20 X for protein and Y= -57.98 +1.62 X for gross energy.Also, the increase in body protein and energy (Y) with the increase of protein and energy intake (X) could be expressed by the equations Y = -11.33+ 2.68 X; r 2 = 0.98 for protein and Y = -85.67+ 3.48 X; r 2 = 0.99 for energy.From the mathematical models, maintenance requirements of striped mullet (0.195g initial BW) could be estimated as Y= 0 to be 3.6 -4.2 mg protein /(g BW .d)and 24.6 -35.8 cal gross energy /(g BW .d).Thus the data could recommend 3.9mg protein and 30.2cal gross energy /g BW daily as maintenance requirements for striped mullet larvae of 0.195g initial BW.Also, from the same data 34.6mg protein and 345.6 cal gross energy /g BW daily could be recommended as the maximum growth requirements for the same striped mullet larvae.The data of experiment 2, indicate that 26 % dietary crude protein is the dietary crude protein needed for maximum growth and feed efficiency of 0.2g striped mullet fed at incremental dietary crude protein levels from 14-38%.