Fish Hatchery Management - fisheries & aquaculture

HAl'CHERY OPERAl'IONSTABLE13.s()L.l{CEs()tp2();tN-coNtN,l!.RCIALpH()spHAIEFI,,R'til.tzl.tRss()t'Rc t.t l\,l,\ I I.rRtAIcll r'r1r1 lc,\1. t. ()R\.'rL r..{ P2()1 .\\'1il.'\Ult. II\Ammoniummetaphosphate(NH1) rPo rVariable solubility: hasI 7' nitroqenBasic slag(cat))r.Prt), sit),Poor in cirlciun-richwa tc rsflone meall5Not readilv availableCalciu mca (po3)2(i0 {jjL,qual to superphosphatemetaphosphatein acid and neutral soilDefluorinatcdCa(ect,),-1 1.3Used prirnarilr. in lire'rockstock feeds; insolublein $ atcrD iam rnon iu rl(su,)rHto,53Cornplctcly uatt'r solu-phospha tcble has 2lnitroqenEnrichedCa(H2PO{)2.12About the same as orriisu perphosp hatenar) superllhosphateM onoammon iu rnNHlH2l'O++lJCorrpletelrwaterphosphatesolublc in form o[ammophosphate; hasI I ', nitrogcnOrdinaryca(H,P() r),I 8-20Notcompletcl\' $ atcrsu perp hosp hatesolublePhosphoric acidH JPOl7'2.5Water soluble and acidin reaationPotassiumKPO r;5 5lJEqual to or superior tometaphosphateordinarysuperphosphate;has it5 3itKrORock phosphate(Ca.(POn)2). CaF2'.1'2Least soluble ol calciurrsalts; availabilitv varies fron 0 to I 5'I riplelCa(H2t'O1)2).1-1-1 5 IA rnajor portion iswater-solublcPhosphorus will not exist for long in pondwater solution. Although bothplants and animals remove appreciable amounts of the added phosphate,the majority of applied phosphorus eventually collects in the bottom mud.Here, phosphorus may be bound in insoluble compounds that are permanentlyunavailable to plants. Some 90 95",, of the phosphorus applied tofield crops in fertilizers becomes bound to the soil, and the same may holdtrue in ponds.