Lub alevin yog txiv kab ntxwv, zoo li lub qe. Nws yuav tsum nkaum ntawm lwm yam tsiaj. Nws nyob nyob rau hauv qhov chaw hauv pob zeb.
Alevins noj dab tsi?
Fry siv ib xyoos lossis ntau dua hauv lawv cov kwj hauv tsev thaum muaj qee hom, pub rau kab thiab lwm yam tsiaj me. Rau cov hom no, cov kwj dej zoo nyob yog qhov tseem ceeb tshwj xeeb. Cov nroj tsuag streambed tsim ntxoov ntxoo thiab txhawb nqa ntau cov kab uas cov tub ntxhais hluas ntses yuav noj.
Lub qe ua Alevin li cas?
Thaum lub qe salmon npaj txhij, tus me nyuam ntses salmon yuav tawg tawm ntawm lub qe mos mos uas khaws cov yolk raws li ib tug nplua nuj hnab uas dai hauv qab nws lub cev(yolk sacks yog cov txiv kab ntxwv hnab hauv qab lawv). Nyob rau theem no, lawv hu ua Alevin thiab ntev li ntawm ib nti.
ntses salmon nyob qhov twg?
Salmon nyob raws ntug dej hiav txwv ntawm ob sab qaum teb Atlantic(ib hom migratory Salmo salar) thiab Pacific Oceans (kwv yees li kaum ob hom ntawm genus Oncorhynchus), thiab kuj tau ua. tau nkag mus rau hauv Great Lakes ntawm North America. Cov ntses salmon yog tsim los rau hauv aquaculture nyob rau hauv ntau qhov chaw ntawm lub ntiaj teb no.
Yuav ua li cas rau lub trout thaum lub yolk sac shrinks?
Lub yolk sac shrinks as the alevin tsim qhov muag, hniav, thiab plab hnyuv. Thaum cov ntses siv cov khoom noj hauv lawv cov yolks, lawv hloov mus rau hauv kib, ib feem ntawm lub neej tom ntej.
