Abstract
We present results of a long-term study aimed to optimize Nile tilapia O. niloticus production in a recirculating aquaculture system (RAS) in Mexico City. Three experiments were evaluated: 1) fry production; 2) production of masculinized fries; and 3) assessment of growth under three different densities (10, 30 and 75 fish/m3). The broodstock produced on average 2400 ± 600 fry every 15 days during six months, with a total production of 28,800 ± 2000. One hundred percent males were produced in 274-L raceways in an eight-week period. The obtained results in fish production in the RAS system indicated variations related to density. A daily growth rate of 3.6 g/day was registered with a density of 10 fish/m3, 0.9 g/day in 30 fish/m3 and 0.4 g/day in 75 fish/m3. This information could be useful for production purposes in this type of systems.
Highlights
The production of tilapia in Mexico reached around 77,000 metric tons in 2009 representing an economic value of 26 million USA dollars [1], from this production approximately 4000 metric tons were produced in more than 1000 tilapia farms all over the country, and the rest was obtained in inland waters fisheries derived from aquaculture introduction actions [2]
Fish were fed with a commercial tilapia diet (25% crude protein, 5% lipids, and 5% crude fibre) at a daily rate of 2% of total body weight (BW) and twice a day (10:00 and 16:00 h)
Previous experiments have demonstrated that the number of eggs per female, number of eggs per spawn, and number of spawning per female are significantly higher in a 12L:12D photoperiod and that inter-spawning intervals were shorter [13]; Campos-Mendoza et al [10] mentioned 18L:6D as the best photo- period to produce larger amount of eggs and an improved total and relative fecundity in females
Summary
The production of tilapia in Mexico reached around 77,000 metric tons in 2009 representing an economic value of 26 million USA dollars [1], from this production approximately 4000 metric tons were produced in more than 1000 tilapia farms all over the country, and the rest was obtained in inland waters fisheries derived from aquaculture introduction actions [2]. During the last 20 years, inland water tilapia fisheries have stabilized at an annual production between 60,000 and 70,000 metric tons, and no production increase is expected in the near future. For this reason, tilapia culture is increasing. In the present study we characterized results of a long-term experiment aimed to optimize Nile tilapia O. niloticus production in a recirculating aquaculture system (RAS) in México City and under different phases of the species life cycle, from broodstock, proportion of male production and growth up to table-size
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