147 lines
5.8 KiB
Plaintext
147 lines
5.8 KiB
Plaintext
Polluhon, in all ils lorms, nlosl rapidly permeares
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lindscapes and soelenes via waler. Whom/u we nave
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used bloodes in a ealcnulenl, we ran leap dealll in llle
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rivers and llle seas nllslwre as lar our ds llle reel areas,
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and in in: sea ilsell. Tile dealli oi will reel areas is
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elosely eorrelaled Willi llle use ol 2,443 and 2,A,5~1
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inland Preservanon ol llle cleanliness and varlely al
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wakr nabilals is as mural in llle survival oi nalions as
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is lire eonservalieul nl soils solll are in peril loday.
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ln speeiallsed sullures, wa|er beeomes the main
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medium lor llle snslenanee, and all island euliures
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nearly cornbliu llle wimr and earlll resources, as does
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lne old Hawaiian ahmm synlllesls {figure 10.13!
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Elsewneie, as on llle zupbrals and on me Tilleaea in
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Peru, whok- eullures based on reed Ms derive lurare,
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boals, hansms, bread, and meal lrom Tvpllul
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vnrngnirles, Cypenis or like reeds, while ii is said lhal llne
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Azlms al Lake lenlxnllllan in Mexleo llad wbal is
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possibly llle nwst prodllelive syslern oi polyculmre yel
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devised, Wllh einnarnpa mp, waierlowl, reedbed. arid
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llsll elilluie mmhmldv
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llle eullnres in lemaeed padl (rice and ram: serve
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inuell ol Asia and oeeailia, min minor subsidiary
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erops. llle dellale maaes ol llle Fly. cllall rialla,
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Mekong. Nile, and Gang: rivers suppnrl lien eulnlras
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0! gm." \‘Irifly and msuume ch ,Wnll marine,
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esluary. Iresllwaler, mangrove. and land organisms in
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elimise lroirl. Many ol lbese idvnnmsrs ean be lal ly
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eneaply cleared in ulosl lniinld and some and environ
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ineills, even il in rmnlalure
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senile |M woes, llleie was a lively and large global
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aquerium liade, and planls. nlolliises, lisll and no
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doubl ase mgamsms were widely dlslribured
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Many oi lbese were released inio loeal slreams and
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brealne llalurallsed Even lilis eiieel was dwarled by
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llle gnvzmmrnkasslsled disliibnlion and pidreelilrn ill
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salmnnid lull as a preserve ol llle ldle and die amuenl
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A leyv lien species, nolably rilapia and carp, were
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blvushl in as a basic larmed lood lor renaee nee and
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rare enlnire in Asla m in (amine areas However, ii is
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slill |r|u‘ mar llle grear ulaioniy ol aliuaeulnires nave a
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piedominanlly local flavour and species cumposlfinn,
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and led lmrodueed speeies nave proved (a be as
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adapled and produellye, or as uniquely sulled, as
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indigenous spenes. Only ll mere are no loul rpetits, or
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it all ll-ials in using lo<al speeles are iiuillmr, do people
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look lo exotic lorrlls
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Aquatullum new range rroln open—warer rage and
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rlngmel sysreuls lo hIgMy inrensive rank or channe‘r
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llow (“hung 0n fluids, alolls, and in desens, lolally
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innovalive sysxcms have evolved—and wlll lil llllllre
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EVnIvhwhcrr loeal speeles were absenl or 0! minor
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pnlduthve (apanly As palagie lisliei-ies are Explolwd
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by llle oilenen weslrm lulimi, island people have been
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{ox-«d ro develop allelilanve sysrerns, and Aquaculnln‘
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is one at lllese. llnlllle lerreslrlal eulrures, many
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aouaeulruie developmenls have been pnlyeulluml
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[mm lllelr ineepinm.
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132
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THE CASE FOR AQUACULTURE
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Unhl lne lasr lew decades, we nave been able in harvesl
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silliideni lisll, nliilluses, and planis lmnl nslural waler
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syslems ms is m longer we ease, and a new impelus
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ls evidenr in llle creanon and eulluie ol organisms in
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the aliuarie liabllar Even inoupl. a lunlled plodndlom
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lias exisled lor millenla in all eonxinenls. new speeles
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are bmnghl lnlo rullure annually, and lbr pmblems ul
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hmding and rearing a wide range ill orynisms are
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being solved
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niele are mmplei masons liir llle sudden revival and
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Expansmn ol aquacullural sysleuls, some ol lllese are
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undoulxedly eonneeled wnh overellslluie ol llle inanne
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resouiee, bul pernaps as iinponaill is llle change in
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lood liablrs resullmg lroul global lravel and
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inlonnallom W|lh a consequzm ellange lroin lally and
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red meals lo lisn and slrellrlsll, and a general wldl‘nlns
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oi ins demand ior varieiy in loods lllai an be ealen
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nw ur llirlllly cooked.
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Waler culmms llad lone-ruled and undnubled
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slablllly. and many nave perslsled wllhmn ealernal
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impuls lor lllousands all years The slabilily and
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ploduedmly ol aquamallure ryslems ale superior lo llle
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lei-labial mlrure sysrelns so In developed clven llle
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same inpuls in energy or nunlenrs, We ean eipeel linul
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4.20 limes llle yield lrom waler inan lllal liorn me
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adyiining land To summarise wily llns ls llle ease, we
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need only lo nine llial
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. Waler supply is eonslanl lilr planl and animal
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inuwlli in aonane and 5Dml»aqua|l( nabnals
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- planlnurrlenls in panlculai are svailableln soluble
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and easily assimilable lnrm.
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. Waler and null-lenl new is a radar nol mpmsenkd
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in llnlds bnl is a mural bodsl in produsliml in warer
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- Waler organisms insll. sllellilslll need wane lillle
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energy in innivenieial. iney nre largely [we cl
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prayilanoilal elleelsarld W215!“ disadvsnlages,
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- ngm, nulrienl, and planls oculpy a lllreee
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dimensional medium. There are complei edges,
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iurlaees, and eondiliorls developed as a rerun, and a
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nanny nlspeelesioodeupy lllese
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- rile linen rigl land very reeenlly moneeulnirall
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inblbllloiu M rarrneis are nnl as yel evidenl in waler
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eullures, wnere mu )dvnnhgcs ol polyeillluie have
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been vemgmsed lroin llle beginning
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. Energies lorl in snlllvalion are eliminaled or
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mdlked in aliualie syslenls, allliollgn managemenl may
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need re beas skllled as ii is lor land mops
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- llllpeunded waler loss a gleal val-lely nl produels
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olner lllail loodl l nows oil lo energy produchon,
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leereaeion, lrrlaalion sysleuis, and transponv
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Although all rilese masons liar grealer yields wlrb less
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inpuis have always been them, larnlels gmmlly
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bale been slow in emlverl lo aquaeulnares, and pernaps
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rightly so wilere a supponing inrnslrllelllie ol sldrare,
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lrailsporl, and sales is laeliini; But as inese begm lo
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develop, men ll becomes worrllwlllle lo abandon llle
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produerloil ill llle many surplus eoinmod as new
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flagging world inod markels in llle developed
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458
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