Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (122.68 KB, 2 trang )
farmedsalmonandtroutdon’thaveaccessto
the wild crustaceans, they have paler flesh
unless their feed is supplemented (usually
with crustacean shell by-products or an
industrially produced carotenoid called
canthaxanthin).
TheFishWeEat
Thenumberofdifferentkindsoffishinthe
worldisstaggering.Ofalltheanimalsthat
havebackbones,fishaccountformorethan
half,somethingapproaching29,000species.
Ourspeciesregularlyeatshundredsofthese.
Perhapstwodozenareatleastoccasionally
availableinU.S.supermarkets,andanother
severaldozeninupscaleandethnic
restaurants,oftenunderavarietyofnames.
Theboxbeginningonp.195surveysthe
familyrelationsofsomecommonlyeaten
fish,andtheparagraphsthatfollowprovidea
fewdetailsaboutthemoreimportantfamilies.
Shellfisharealsoadiversegroupof
animals.Theylackbackbonesanddifferfrom
finfishinimportantways,sothey’re
describedseparately,p.218.
TheHerringFamily:
Anchovy,Sardine,
Sprat,Shad