Evaluation of the stocking density of postlarvae of Penaeus vannamei in synbiotic nursery system
The shrimp nursery is an important tool to improve the shrimp zootechnical and health performances. However, diseases and high mortality rates are the main limitations of the nursery system. Therefore, this work aimed to evaluate the influence of stocking density in the synbiotic nursery system, thr...
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| Published in: | Aquaculture international Vol. 32; no. 7; pp. 8861 - 8875 |
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| Main Authors: | , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Cham
Springer International Publishing
01-12-2024
Springer Nature B.V |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The shrimp nursery is an important tool to improve the shrimp zootechnical and health performances. However, diseases and high mortality rates are the main limitations of the nursery system. Therefore, this work aimed to evaluate the influence of stocking density in the synbiotic nursery system, through growth, microbial composition, and water quality. The experiment lasted 30 days and used
Penaeus vannamei
postlarvae (PL
10
, 0.003 ± 0.001 g), fed with commercial feed (40–45% crude protein) and treatments were completely randomized with 2000, 4000, and 6000 PL‧m
−3
, with three replicates. Before and after stocking the postlarvae, in the experimental units (10 m
3
), were added a mixture of rice bran, brown sugar, commercial probiotic, and sterilized water (Synbiotic). The bottom water of tanks was drained twice a week, totaling a total 5% water exchange during the total experiment and alkalinity was corrected with calcium hydroxide (Ca(OH)
2
) when the alkalinity values were < 100 mg CaCO
3
‧L
−1
. Weekly, the total ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, and total alkalinity were monitored and microbiological analyses were conducted at the beginning and end. After the trial (30 days), the influence of the different stocking densities on the final weight, survival, feed conversion ratio, weekly growth rate, and productivity, with higher values for 2000 PL‧m
−3
. Also observed.
Vibrio
spp.,
Lactobacillus
spp., total heterotrophic bacteria, and yeast count values increased by the end of the period in all shrimp stocking densities, however, with only significant differences in yeast count. In relation to ammonia, nitrite, and nitrate, no significant differences were observed in the influence of the different stocking densities. Based on the data obtained, we recommend using a density of 2000 PL‧m
−3
in the nursery phase, with better zootechnical performance, water quality, and microbial composition. |
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| ISSN: | 0967-6120 1573-143X |
| DOI: | 10.1007/s10499-024-01595-0 |