5" day - Central Institute of Brackishwater Aquaculture
5" day - Central Institute of Brackishwater Aquaculture
5" day - Central Institute of Brackishwater Aquaculture
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uidmoiveatho~vacbrrrintbtduAgcrrmovdp<strong>of</strong>ar. DLppoVl<strong>of</strong><br />
sludge on high gtcund reduces thc impa <strong>of</strong> dnL, huvca effluent w Ihc receiving<br />
raummd incutainsiaurionsnuyimpwehipamdwil@i.<br />
Shrimp pod will coruis~ prinurily <strong>of</strong> m i d soil (95 - 989") and muin only<br />
I lialc organic urban (2-5%). In our mdy in Nellom District <strong>of</strong> Andhn W h and<br />
V.0 C Dtmict <strong>of</strong> Tmil Ndu. it was obsavcd chi thc organic carbon content <strong>of</strong> the<br />
soil never incnued beyond 1.5% during cumuulurvcs~. Hrnce moval <strong>of</strong><br />
rcdimtnrP from pond boaom may mu be neceuary.<br />
3.131 Poad mnimmama<br />
TkrpcnddUrob~vlrbwil~khrboeoms~uidrhc<br />
innn slope <strong>of</strong> IIK dike is unuolidued with soil. Tunnels 8nd hole mud by<br />
bunowing organisms w to be clordlplugged. Reccndftioning <strong>of</strong> the bmom trench<br />
leveling <strong>of</strong> pond botbnn. repairs <strong>of</strong> sluice structures and sluice vmns arr also lo be<br />
acnded.<br />
3.13 nltlng<br />
Tllllng or ploughing or nking thc botMn Boil impmvw roil qdity by oxporing<br />
subsoil to the umotphsrr thereby qmding up Ution pcocels 8nd relure <strong>of</strong><br />
nutrients rh.1 w lakod in the soil.<br />
3.1.4 EndluIh <strong>of</strong> pdaiorr and nnwrmted specks<br />
After che crop is huvescod, undesirable like pesis, mpctitors and<br />
predators remain in the ponds, which should be removed. Peds arc species that<br />
gcnmlly de not b8ve d h humhl etfsu on the cultured stock. Some pens like<br />
cnbs bwow into dikn. This can dun* Ihc dikw and uwc 1- which may<br />
allow my <strong>of</strong> uadrhbh -In Into tk. pond or tkr #ups <strong>of</strong> culW rpo$les.<br />
Compakon uc rpacler cba canpate fbr qucc. food oxygen ctc. with the stocked<br />
species. Predators w the species that prey on the culm sock. These species<br />
include finfishes, crustaceans and molluscs. Elimination and conbol <strong>of</strong> undesirable<br />
species fmm shnmp culture pond is very impomt to get good yield. There are two<br />
methods to conml che undeainbk species.<br />
EhuwmUd<br />
The most effective method is drying the ponds. Dimt sunlight helps to<br />
disinfect the pond bottom <strong>of</strong> light sensitive pathogenic miau organisms (bacteria<br />
fungus, vinrs) md to desiccate egg, larval md sdult nrpw <strong>of</strong> predators. It also helps<br />
in elimination <strong>of</strong> undesinbk algal mats <strong>of</strong> filmentous a1g.e. Unwanted organisms<br />
w moved from the pond by drying <strong>of</strong> the pond bottom. Other methods includc<br />
innslluion <strong>of</strong> appropriate m s in the wtldmlct gata to prevent entrance <strong>of</strong><br />
undeainbk rpfioh propt nuintcrvncc <strong>of</strong> d h .ad w w @tea to pmvmt b e<br />
and m adlure boring apnimns Ika onbr md -1. halng cukum, xlstive<br />
hmning or the ur <strong>of</strong> M am ran be romaosd m mtnblzc the imp.* <strong>of</strong> Mdoinbk<br />
speck<br />
shmkusw<br />
In cases wherc complete drying is not possible, organic, biodegradable,<br />
pisicidor nrh M Wu oil wke (100-150 ppm) .nd ta d &(IS-20 ppm) can<br />
kwdEndk.tkn<strong>of</strong>uDbrlnblrlpolaLny~r*uy,s&Bcl.NadEut<br />
when drmiils we ud. Thia is bawa cbaaiais w u fonwt a systemic
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