The edible portion nnd tho fnt nnd protein contenta of thu Ilc~h of various fishes n(rect their contribution to the Ikitish diet. Ilcs11ltrc are discueeed for the most importnnt ~Aible slnxics. Fish muaclo contains tittle connectivo tissue nntl them nw indicntions of scvernl unknown protein frnctions. The non-protein nitrogenous ertrnctivcs nntl their relation to keeping quality nm also c l i s c u~~d .
QUAITITIES AND TYPES OF BRITISH FISKThis pnpm deals with the chcmicnl composition of the edible pqrtion of iish hi the rnw stntc, hot taking,nccount of vitnmins, nunernls, trace elements, ctc., which will be discussed by Lovern.1The great variety of species presetits n complication in denling genernlly with fish ns food. Some clnssificntion must be ndopted to show the relative quniititntive importance of slwcies, nnd this is done in Tnbles Ia niid Ib for the dcinersnl and pelagic marine fishes.g. The sclieriie ndopted has, upnrtfrom tho " JIiscellaneous " group, considerable bnsis in zoologicnl and, us rill be seen later, to some extent in biocliemicnl relationships. Amongst the demersal or " white " fishes, the prepoiidernnce of the Gadidm is striking, in particulnr, the contribution made first by the cod. nnd then by the hnddock. Xext in order come the " flat fishes " with the plaice greatly predonlinnting, but only cquivnlent to some third part of the lnndings of the linddock. This group contains most of whnt ore nt present regnrdcd as the choicest species, but ns JIcCnnce and Shipp' justly remnrk, this hns no relation to nutritive vnlue. Each about hnlf AS importnnt ns tlic flat fislies nre the Elasmobrnnchs nnd the " ilIiscellnncous " group in Table Ia. Amongst the pelngic fishes, tlie herring is by fur the predoriiinont species, being comparable iu importance with tlic cod.Of the frcs~iwater fishes (~u b~e IC), oily imported cnuned salmon is conipnrable with the ninrino species in the quantities consumed. Of home-caught frcsiiwiitcr species, only snlmon6. nnd both of which x p i d n proportion of tlicir life in the xen, nre widely enten in this country, iilthough in countries wit11 large rivcrs nnd * rkes the fresliwnter fisheries are of considcrablo economic importance, and on the continent are augmcnted by pisciculture. Cnrp is the fish most usunlly doniesticnted and large farms nre kept going on towns' wnstc, with quite economio returns.' Efforts nrc now being made to organise n commercial fishery for perch in some of the lnrger Britisli Inkcs, in which they nre n pest. Up to dnte s m l l fry have been cnuned on n sin1111 scale with fuir ~uccess. ((1) Sheiffiah Nomny lobstor, prawn, shrimp, clam, m n w l , cockle, cscnllop, Crub, lobster, cruwftsh, o y t e r (uot sold by weight-npproxi-queen, priwinklo, wholk . .070