ANS18-10-L11-LIMITS-FERT

ANS18-10-L11-LIMITS-FERT - Tilapia Tilapia have been...

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Tilapia Tilapia have been introduced into more than 90 countries on all the continents except Antarctica American Tilapia Association - http://ag.arizona.edu/azaqua/ata.html * tilapia – second most important fish in aquaculture
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* tilapia – second most important fish in aquaculture Tilapia = 2,798,000 mt Catfish = 2,781,000 mt Tilapia aquaculture Production Subsistence 2,798,000 mt ?
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Advantages of tilapia Grow over a wide temperature range Classified as a tropical species with respect to temperature. Maximum growth occurs ~ 30 o C. Feeding activity is reduced below 20 o C and stops ~ 16 o C. The lethal lower temperature is ~ 10 o C.
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Advantages of tilapia (cont.) Grow in a wide variety of water conditions – Salinity from freshwater to seawater – Acidic (pH 5) to alkaline (pH 9) – Survive low DO and high ammonia – High densities Prolific – Mouthbrooders – parental care – Relatively large eggs removed young can be fed on powdered feed – Female will resume breeding – Sex reversal all male
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Advantages of tilapia (cont.) Feed low on the food chain; typically omnivorous –In low input systems, fish gain all their nutrition from algae, detrital matter or small invertebrates –Intensification is relatively easy as they will also feed readily on formulated rations Tilapia profile from Agricultural Marketing Resource Center – see: http://www.agmrc.org/commodities__products/aquaculture/tilapia_profile.cfm#
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Tilapia Production in Bangladesh Gupta et al. 1992 http://www.worldfishcenter.org/libinfo/Pdf/Pub%20TR4%2035.pdf Bangladesh - fish = 60 – 70% of animal protein Per cap. cons. = 7.9 kg/yr Urban elite = 22.1 kg/yr Rural poor = 4.4 kg/yr
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Light Carbon dioxide Appropriate temperature
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Nutrients Appropriate salinity Mixing
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Careful regulation of algal density
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Stocking recommendations 20,000 ha (2/m 2 ) Pond size ~ 150 m 2 3 – 5g fingerlings Reach table size in 3 – 4 months
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Supplementary feeding Supplement feeds With kitchen and farm wastes Rice bran 3%/body weight/day
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71% 199 191 19 kg (101g) 12 kg C 15 $ M 47 % 82% 316 107 21 kg (110g) 14 kg C 16 $ F 68 % 93% 160 182 25 kg (97g) 18 kg C 15 $ T 90 % Next Year Water Days Pond Size (m 2 ) Prod./Farm Tilapia Production in Bangladesh Gupta et al. 1992 Rural poor = 4.4 kg/yr
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Dr. Gupta’s achievements in freshwater aquaculture have helped millions of rural farmers overcome severe poverty and nutritional deficiencies. Dr. Gupta developed low-cost technologies to increase fish yields and educated impoverished farmers, specifically women, in freshwater aquaculture practices. His efforts led to a significant rise in the consumption of fish – a vital source of protein and vitamins – in developing countries in Asia and Africa and
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This note was uploaded on 03/25/2011 for the course ANS 18 taught by Professor Mchenry during the Spring '11 term at UC Davis.

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ANS18-10-L11-LIMITS-FERT - Tilapia Tilapia have been...

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