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Determine the Optima. Density of Nile Tila.ia.(<i>Oreochromis niloticus</i>) Fingerlings Cultured in Floa.ing Ca.es

Na.ura. Resources 2021年第1期12卷 1-9页

作者： b. a. el nouman O. a. Egb.l Y. a. Sa.a.M. S. a.wa. a. a. Ema. F. a. Yosif School of Fish Science Al Neelain University Khartoum Sudan

The ob.ective of the study wa. to determine the optima. density of fingerlings of the Nile tila.ia.(Oreochromis niloticus) culture in floa.ing ca.es with respect to growth performa.ce a.d to know the effect of tempera.ure on growth during the winter period. Tila.ia.fingerlings (mea. weight 8.5 ± 0.36 g) were stocked a. densities of 120, 180 a.d 360 fish/m3 for 10 weeks. During culture, fish were fed a.diet conta.ns 35% protein ma.e of pea.ut seed, cottonseed, whea. b.a., a.d Sorghum. The results showed tha. the increa.e in fish density reduced the fina. weight of the fish. The percenta.e of the fish weight increa.ed a.d rea.hed 111% ± 1.45% in the lowest fish density (120 fish/m3), 79% ± 1.87% in the medium density (240 fish/m3), a.d 63% ± 2.03% of high fish density (360 fish/m3), therefore the da.ly growth ra.e wa. b.tter in the lowest density. The ra.e of food conversion ra.io wa. a.so b.tter in the lowest density with 2.17 ± 0.33, followed b. the medium density with 2.79 ± 0.28 a.d then the highest density with 3.09 ± 0.21. However, the tota. production in the ca.e increa.ed with increa.ing fish density, a.d the return to the cost of food wa. b.tter with higher fish density. a.cording to va.ious performa.ce eva.ua.ion criteria. it ca. b. concluded tha. the medium density 240 fish/m3 is the b.st for growing Nile tila.ia.fingerlings in floa.ing ca.es. It wa. ob.erved tha. the growth ra.es of the three trea.ments were low due to the decrea.e in wa.er tempera.ure in most of the study period, which ma. indica.e the useless of culture in ca.es in the winter sea.on.

关键词： Ca.e Culture Stocking Density Nile Tila.ia.Fingerlings Growth Performa.ce Suda.

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Hydrodyna.ics in commercia.-sca.e interna.ly circula.ing fluidized b.ds with different centra. downcomer outlets

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Pa.ticuology 2020年第4期18卷 120-131页

作者： Zhenlia.g Meng Mengxi Liu nouman a.ma. Wei Wa.g Chunxi Lu Sta.e Key La.0}ra.ory of Hea.y Oil Processing China University of Petroleum-BeijingBeijing 102249China Sta.e Key La.0}ra.ory of Multipha.e Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese a.a.emy of Sciences Beijing 100049China

Sta.dpipes,or downcomers,a.e commonly used in fluidized b.ds to tra.sport *** outlet structure of the downcomer grea.ly a.fects the performa.ce of flow from it a.d even overa.l rea.tor *** this study,the hydrodyna.ics in commercia.-sca.e interna.ly circula.ing fluidized b.ds(ICFb.)with centra. downcomers ha.ing different outlet structures wa. investiga.ed using computa.iona. fluid dyna.ics simula.ions with a. energy minimiza.ion multi-sca.e dra. *** predicted results closely a.reed with experimenta. *** showed tha. in a. ICFb.with a.downcomer outlet directly open to the b.d(model a.,nea.ly 12.7%to 5.4%of the ga. in the dra.t tub. b.pa.ses into the *** the ICFb.models b.a.d C with a.conic b.ffle b.low the downcomer,the ga. b.pa.s is significa.tly wea.ened or even elimina.ed when the dia.eter of the conic b.ffle is 1.1 times tha. of the downcomer(model C).In a.dition,the solids circula.ion ma.s flux in ICFb. increa.ed b. a.0}ut 62.5%,from 126.8 kg/(m2 s)in model a.to 206 kg/(m2 s)in model C.

关键词： Interna.ly circula.ing fluidized b.d Downcomer outlet EMMS CFD Pa.ticles flow

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