138 lines
4.4 KiB
Plaintext
138 lines
4.4 KiB
Plaintext
predauon by hummus ur large predarnrs, by diseases
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or parasnes earned in uy srrmm warer, as a resulr al
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eaueene near or eoid, and by amdenlal draining oi rne
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pond here are olvvious preenununs lu |ikz, mvoh'll‘g
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lenees, locks. aurornaue signalling or pumping sysrems,
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and predaroe eonrrul. me on. eulmeaiisl needs to lrve
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elose ro ur nverlmkmg rire pond area im all inese
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reasons.
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losses due ro sudden hnvy earns m aauarme ponds
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may be unavoidable in srmmp eunure, bur llood bye
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passes are a nurmal preeauunn Ill lresnwarer pond
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eulruee. As lisn densiry rneeeases, rlie upper irrmrs to
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yield may be derermrned by pond ware. qualny and a
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ser ol palhugens enmunglzd oy (mwdmg. nus larler
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laerur may be inn ulrrmare oamer ru yields, as n is in
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land llvasllxk
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S1OCKING Mm
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nus rs a aniul Victor, Some or lire sioeleme rares are
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Swen in HR above examples, and ilrey range lrom
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zoo-zoo lrsii/lra tor a predalar rn soon—mm lralr/ na
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lor plankion oarera and deli-nus leedees like rrlupra or
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earp. Trial is, rare-s depend on rlre aorirry ol line lxsh rn
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srand crowding, nnd luod, and use lood elneienily
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Very low sruekrng rares produee low yields nl large
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lrslr; urns beware ol early rnais widen snow a low yield
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rl lisrr were slockzd lalnner al less inan wool in Tun
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dense o rare wrli eesuir in a larger propoeuon ui
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unmarkelahlesmall lrsn Wynn rolerare some 549% or
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srunud nsn, our no more rlian thin Examplxé ol such
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laerors are-
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RATE/HA YIELD MARKETABLE
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chr m
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Tl—LAPIA (allowlng T2?! T3 sir ‘F markeranlel _
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5,600 3162 97 5
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“1,000 403 2 5(7.‘
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EuFFALDl-‘ISH lallpwing an average or 259 yams as
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markeublel
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300 I52 ivuagmg we 5 Hrs»
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sou Z735aangingw3g/llah
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Law 6565 averaging 39!! 3 my.
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From me apove dala, wc have exceeded rne sensible
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sroexmg rah: Im nlrpra, and nor yer readied are rare
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film would reduee "marketable size“ lor unilaiorrsn
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lnerdenralry, Tllnpla at peiow maxkd siee luck 7 munrrrs
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more lo reaerr me lxmn or 200 g aenreued by rlre rasl
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growers in n monrn lSwrngle, was) Time is a
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seieenon laeror llwnlved hem. and we all sexeu lroun
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rrrelasr gmwels lur lurure bmod nsrr
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Mlmgemam nelps. in mm one heavy sidekrng ean be
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sold all as thry reaeir marker sue. or a predaror can pe
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added ro euli rlre smaller lisn. However, we need a
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Hand measure ol aynmum stinking rare fur every
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spccies used. and irris an only be aelireved ny
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oxpenmenr similarly, we need rd deride rlre raies ar
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wlnen poiyeulrures ol fish are sioelned by assessing rne
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472
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propomun pl roe-small fish in any one speeres in me
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pnlyeulrure al hawks! nme
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Manda
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risn smoked as llngerhny lose a lor ol lood uniees a
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lad-breeding loraee fish unlrses i|. Fingerlmg numbers
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ran all rapidly as rlrey glow lrn predaiory lisn, by
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eanmoalrsmr. bun wilh supplemeniaey laod. muer.
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largee numbers eanbe stocked, saved, and inereloreean
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use rne namrai loods better, Alsn, rney reaelr alarm
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sire muen lasler, e s wrrn blown rmnlrnad lail asn led
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wmie warer was above lavcl See Table in,
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MILE “.1
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STOCKING RATES m FER'nLISED FUNDS
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no. STOCKED Flsll PRODUCED
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L06! numeral hlogllms
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1llapla alone
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2,500 sal 7
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5,090 um
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7500 lm l .5-
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isaooo i new
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"upl- ulrrr emu-n
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(III lisn led al we Musl
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550 302
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2.50m i we 7
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mm 7
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2,646.6
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‘Abovll rs raid rln spawning Damned m mow-n
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135
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FISH POND CONFIGURATIONS AND
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FOOD SUPPLY
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POND CONSTRUCTION
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pond or lorraee eonsrruenon on rne small seaie no 01
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hi) can he lrand-luned lar damage. levdhng, and
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spxllways, pur lareee ermsiruerrnns arise eirner as a
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resulr or many years of nand labour, and are liren builr
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ro sun rlre Iindicape, or are min in modern timer by
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survey and maelune Snl|~ponds love an resennal need
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lor a eompace elay pare, wlrrle rrdal and diversion
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ponds aan roleraie some losses lrom seepage
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New ponds need earelul assessmem and survey lor
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laeiors ol evaporarion. secpasrr waree spines, sealing,
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and stability. As low fish ponds eaeeed 2—3 m m depin,
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eaelir. clay, and alone—laud eaearr walls sumee in bold
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waree (Figure uni Many noun ponds and lasi-llow
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eirannels are eonoeresealed in rnrensrve syslems, iaur
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by lar lne mosl produenve, eommon and eeonomieal
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ponds are elayeuased ronds can evolve Imm
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low—walled padr ra deeper peemaneni or seasonal nan
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sysrems, or lravea dry eyeie m summer seams
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Th! enapler on warer deals will. in. essennals ol
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eonsrrueoon ol dams me elay eore or seal rs eereerive
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m numalurem fisli ponds A build-up olorpanie muleir
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and algae in ponds assisrs Seallng, so ml even ponds
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