107 lines
3.8 KiB
Plaintext
107 lines
3.8 KiB
Plaintext
days lin oeeaiui, and can boadded loqulel marine laays
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as well as in ponds, Mussels in parlieular (curry
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phosphales In lne inud vii ineir anal siphons, and aie
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rhe niayoi phosphaie mvuxr ol ponds or rivers As
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eyeii inodesily ienilised ponds ean alier lhe yield by
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(aelors ol lroiri 2 lo m limes, ahenhon lo nuri-ienr
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supply is a mliczl sri—ilegy
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A; leriihser upralre is no rapid, we need In suxk
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lemle ponds wnh shrimp or large numbers 0! small
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Image ion while our finglrflng pan fish ire gmwulg. or
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we lose yields rooehigh nilrnle srarus ean be lilreied
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via a lorage iood pond o4 crusiaeeans, or ehiough reed
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beds We rely on land rrop downsneam lo rrmnve
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exeess nulnenr iron. pond oyerllow in now—on o!
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ponds, we mu usually aehieyo a dnubllng in yield ui
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species soeh as melons, ioniaioes, or iuel loieao, so ihal
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liah ponds aie a key lealure in raising land—based
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yields Swinglz (x966) ieeaids a dineienee in yield far
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mussels lin uie seine wild) of [mm 52,» k5 unlernlised
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lo ml: kg leiolised (whole washr, mus aie m of
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lolall so that she lenlliser laelor, well-mnnlszdi is a
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eriiieal yield slnlngy
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SHELTER AND REFUGE
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Sucks oi pols, papa, lyies, aiul bundles oi rope, reeds,
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or brush ean have a deelsiye yield elleer ori predabun
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losses 0! young fish, erayirsh, and species subiesl In
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yndahon by lheir lelluws, Crab and erayrish eulhiie, in
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parlieular, beneals horn sueh ielupes. similarly. loose
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speries in ponds need buzdlng reiuges in persisi
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Figluei are hard ro eoine by, bur yield increases or
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mm are rewrded [or mislaeeans, and minim loi
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louse llsh proleeled by shallows or wrcdy areas
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Monaliry oi yuan; and lry am always greaier in ponds
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ol simple design and wuhoul essapenienls, Cage
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mltul'e is no. only in ilsell a highe eld syslern, uul
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enables rhe so—ilepe separalion oi pied-mi and piey lur
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aduhs and iuyenilesl.
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TEMPERATURES
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mhin waier, surlaees and gmdlmh’ dtvelop iruin m1:
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enecb o1 heal, soluies, parneies. or sneairi now These
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are uiilised diaeaenlly oy dllfen‘m species, so ihal a
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nvrr or Iigncn opening by a shallow bar lo rhe sea rriay
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hnye sallwaier llsh al depnh and lieshwaler spedes on
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lhe upper session, and eiiher coldrr lornis al deplh or
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(In iey winlersl, war-n reluges al deplh for iish io kenle
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ierowd in unlal warmer rundinons dzvdnp)
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m Inberlare belween sold and non waler rs leaned a
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THERMLXLINE and lseiween sall and lroshwaler a
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HALOCLINE, sueh boundaries can be abrupl
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lransihons it no |urbu1enl llow lesls Where no
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pionouneed surlars separanon mls berween ha: and
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sold or sah and iresh, gradienls develop, cspecully
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wheie wind ovenurn or euiaeril how a laelor rish,
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molluses, and planrs have speeiiie uirhos in sueh
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endienis, and may inaue wilh lide or eunenl m adlusl
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l0 lhelr speeilie nzuis
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Al or ahoul 2I'C (70"Fl we nialru a calegorieal
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dilieronee belween raluu-iilri lish, lo whieh sueh
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leinpeearures are lerhal or dehilalory. and lmylml nah,
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whieh suiler cold sness or will nor breed below this
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poinr, A lew eoinnion lish lcanibusm, (he
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mosquiln-ealing iishl aie leinperale lolerani or
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EURVTHERMAL llewcl, bul oprlniuin lending and
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spawning eondirions lur eoldwoler iish are around
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li-lfl‘C, and lor impieals music Rainbow houi will
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die il kepi lor long periods above wc, while Tlluyul ie
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below at
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Hishzl lernperahues renaiiily siiiriulare plani pow-h
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and algze piodurlion, or general turnover, and H is
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aduaniapeous (a be able in keep winler iernperaruies
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ai opiiinuin [or lbe species MIX seleeied We may
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aehieie rhis in any ola numberol ways
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- By lntludmg a solar pond lheaml in any olher
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pond irilu-e mm, or as an dmegary lo a pond
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- Using wasiehealed waier hoin indusiries such as
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power sulions, salrworlss, or lood proeessing planls
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Lwtxw wads:
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nnunz v3.10
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DEVICES Y0 BRING MAMURE m FUNDS
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rm me
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mm M in Asia, land imlnmi is mum lo nanur. Inn will! m lolamrrau,nsbpanulrhiscydaymayiam
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468
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