[Ivm nuui

. mum and [rims Fm ponds, ilie iypes of waier
Im| eonnuls ama ei-irieal fadnr Mndtm pnadiieiiun al
ielialale and flmble pipe iias made very simple level
(0mm! posslhle, eiiliei as an elbow or iipiurned lie-rials
we

Outlets ran also be a hanrfl syslnmi as basxels inru
whidl waier lalls, ur as smallevr ponds wiili sereaned
spillways inai gitlvu fish mlgrilmg duwnslmam liuili
ais used In gafllzr ads “I |m| lnnn sampler swamp
sysienisdillienll ln liarvesi by neis.

lnlelsareliliewise regulaled and screened, laui pieuier
alleniipn inusl be paid la prevenl ilie cmry or sill,
wzeds, or unwanisd organisms iuip inn pund ilsell.
Cpriseqiienlly, inlels can lie (ample): sysieins ul lilleis
and semens wliere waiurduaiiiy is pour, or very simple
pipes wlieie iinppllured and lisleliee waler is drawn
* si sysleius am piynn in Figure

   

CAGE CULTURE
Cages at Wood. woven naiural malerials, ineial inesli
land nawadays modern synrlieue meshes) have bean
used since lnuqmly m lrap ur liaryesi uslii, and an. in
eurrsrii widespread use lur inlensiic [Hi rearing in
bum slrll and llpwing waieis ages can be used to
piuleel eggs and lry, and speeias siieli as snirpedn are
naiclisd in cages {Fig-u! 1131A) Live lisli, crnylisli,
prawns, mulluses, and ze|s haw been iradiiinnnlly liuld
in eapes pr ran/s lpionpuneed sprlsl, Ilpaiing barges.
and wel wells in boa-s rnr me liesli sh markei new
are Aka used in liuld eels, Wsms, crayfish, eaip. and
weed or algae ealivis in nduee algal iainis in liali nesli
[figure 1331.0,

wnem flow is r:pxd,(ag¢ mesli large, or wnvr muluin
exisis, oxygenalmn in rages is nu preal prubhm There
is wmeadvdmagz. npweyer, in snaping cagessnblea |u
rapid lidal llaw. or iu IndflCL‘ waior eireiiLinon in me
(332. as in rim... mu

Normally, however, (ages are circular, as in salrripn
Hug-Ml nilnire. or plain squaie in sun slaiied wood
tansmtlwn Wig"): mml Typical Nanny, (ash in
which lisri am led, and which float in larger bad a!
waier, have a wee flow mainlained by H": swimming
atlmn 0! me fish ilieinselyes Such cagks produre llie
laigesi yields knnwn ipaaiiaeulniis

 

Mucnng rapas an be ellaeled by indiyidnal anchors,
as sels alas“ aiiaened to flaming dub ur walkways,
m as gangs iil rages laskvlzd in lines, and (dllowmg a
buahwxdlh helween saga pal .l, llis- gangs ean be
)iwldwd new bay or anemiied in flunklmfi in own
waler ripi supieei [0 “Glen! wavv aclipn (£15m:
mm old WM serve well as spdcers bflwm'n rage
unis l used eauls fur yaais m shellered bay; in linld
slielllisli and n¢| “Sh lur niarlrei, and mu'lv sullseed
lnsses. laui nll rages need an annual inspeeliun and
witchlul mainisnaneu. piedaiuis siieli as odoprus and
ssnls ean rause large murlalilies in sags hali, wlicreas
pnrid lisii mu aynid sueli 105565 km eyasipn on raw
uerasiuns, large shark aliasx ragsd lisli and deslruy
sages, a luss nul erperipnrad in pom! eiiliuiesl

 

NUTRITION AXD mop sum-ix
rlie sinis cans musi be paid (0 ilie nulnhun ol iisn and
slielllisn as in iliaipl land species Wlamln supply '1“!!!
liesli greens, lriiiis, and algae are esssniuil.
Hipnaprniein lunds, Win a rriridesl admlxhlk pl
slak‘hy loads land all eil inese in lrssli mndlhml! is a
fl‘quxsuk‘ lur lienllny gmwlh, as lernliser is in. planis
rnera is no subsiiinie lar lresli liye lmd la produce
hlgh uualily lisn slime slralugies [m seller lisli
nulnhon am given neie, (he) nie lhl' erilieal simlesies
lurciisi sau gs lur waxy reinseriaiuin)

Fish mainlain prnwln by inning abum l-x nl llieir
badlkwugm d. y, nnd gem mosl weipni (a! ilii leasl
msle nl imidl ulieu led ai m a! bad -wmghl daily
Agaln, iriils ul leedin; aie needid lur spenlie species
and size gNups. in. s n good rule ril \humlv lu fad
inn .is met. [and as will laa rumplerely eau-n in is
minuies, in check on [AM wasied, and in usiabllsli a
gnmlh .unie lniin samples hkn as Iho lisn grow

Demand leedinp, win-re lht‘ lush inemselues nigger a
ludd supply wlien hungjv has ils adi-aniages. b'ul niay
nueessilaie pelleied load: piirrnassd ni mn’w dung. ul
uiral expense Suhrsamples air neiied lisn ean be
weighed and .i wélghed ram)" Md .1! m o( lpial,
allowing a mm. mnmlny in lingerlinps, .ind 40-605!
in lry

|| snpiild bu nhv ous |ha| wnaieyer [mud we enn sniw
in mlleel as 'waaks is a critical [dam in energy and
mi ennseryaupn. Fm some 0! ”less slralagiis ws inusl
look in syslein. wllhln m boundaries m the pund

 

 

   

 

mun: u an
mm small:
in llmnlol have; unmniemniinil m lunpal pullulanir

 

    
 

 

 

490