2 bi o l o g y o f f i s h c u l t u r e a differ enc

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Unformatted text preview: le in la r ge systems. 2 ) Bi o l o g y o f F i s h C u l t u r e: a ) Differ enc es fr om Ter r estr ia l Anima ls: 1) body density of fish = density of wa ter ; they do not expend ener gy ' sta nding' ; oyster s don' t even move, they a r e sessile 2) fish a r e poikilother ms (c old- blooded) - they do not ha ve to expend ener gy to keep their body wa r m; in this wa y fish c a n hit feed: ga in r a tios of 1. 5: 1 (when c or r ec ting fish mea t for wa ter c ontent feed: ga in r a tios a r e mor e like 3: 1 a nd 4: 1) 3) fish c a n be r ea r ed in a 3- dimensiona l envir onment, per mitting mor e bioma ss for a given 2- dimensiona l a c r ea ge 4) fish c a n be r ea r ed in polyc ultur e (not c ommon a mong ter r estr ia l a nima ls), tha t is, mor e tha n one spec ies in a ta nk or pond (top, middle a nd bottom feeder s); inc luding integr a tion with ter r estr ia l a nima ls a s c onsumer s of ma nur e b) Disa dva nta ges of F ish Pr oduc tion: a nima lsc ie nc e 2.uc da vis.e du/a ns1/ha ndou...
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