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Microbound feeds have been well accepted by shrimps and farmers in many penaeid shrimp hatcheries. The present study focused on an adequate level of replacement of Artemia nauplii and microalgae by a microbound diet for rearing Litopenaeus setiferus (Burkenroad) larvae. A microbound diet (MBD) consisting of fishmeal, squid meal, shrimp meal, yeast meal and soybean meal was used. The first experiment was designed to obtain the optimum level of MBD to complete the live feeding schedule, from Protozoea (PZ(III) ) to Mysis (M-III ). The experimental levels of the microbound diet tested were 2, 4, 6 and 8 mg MBD L-1 day(-1) . The next step was to determine the Artemia nauplii replacement level from PZ(I) to M-III by MBD. These experiments were carried out either in the presence (Experiment 2) or in the absence of algae (Experiment 3). Four replacement levels were tested: 0% (4 mg MBD L-1 day(-1) : 1 Artemia nauplii mL(-1) ), 40% (5.5 mg MBD L-1 day(-1) : 0.6 Artemia nauplii), 60% (6.5 mg MBD L-1 day(-1) : 0.4 Artemia nauplii) and 100% (8 mg MBD L-1 day(-1) : 0 Artemia nauplii). In all experiments growth, survival, development, quality index (QI) and performance index (PI), were used to determine the optimum concentration of microbound diet. Results showed that 6 mg MBD L-1 day(-1) can be recommended as a complement to live food for L. setiferus larvae from PZ(III) to M-III . In the presence of algae, maximum growth and survival may be obtained in 40-60% (5.5-6.5 mg MBD L-1 day(-1) ) of Artemia nauplii replacement levels. In the absence of algae, the Artemia nauplii replacement resulted in slower development, less salinity resistance, lower growth and lower survival than was obtained in larvae fed with algae. |
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