Effect of different stocking densities on survival of Nile tilapia fingerlings, oreochromis niloticus transported in plastic bags (Sudan)

Abstract

Background: Fish farmers in Sudan obtain their seed stocks mainly not from their farms, and as such rely heavily on good packing conditions, so to implement most of transporting trips can covering sometimes 8–12 hours transportation time to maximize fish survival and quality. The study here required main objective to identified the optimum loading for the success during transporting . Methods: Closed oxygenated plastic bag which were carried three densities for each one with tow replicate for every treatment for the lower loading is 75 fingerlings /l the medium is , 100 fingerlings and last density is the larger one 140 fingerlings the duration factors was 10 hours, 11 hours and 18 hours .The fingerlings were sex reversed , their size is (5 g ±0.5). Results: The data were analyzed useing spss computer software version- 16.0 Analysis result shown the factor of density in the two treatments (75 fingerlings + 100 fingerlings ) was the best according to the survivor rate depending on type of the periods parameter. 10 hour=94% and 11 hours = 92% and here was N.S otherwise the comparative between those and the density 140 was high significant . Conclusions: Variation between loading and durations is N.S at P<0.05 , so the conclusions is found the optimum loading during transporting period was 100/l/18 (hundred fish per litter in 18 hours period ) according to analysis details