Txhua lub caij nplooj zeeg, cov eels tawm hauv cov dej nyob sab Europe mus ncig hla hiav txwv Atlantic yug tau ib zaug, ces tuag. Tagging kev tshawb fawb qhia tias cov ntses ua luam dej ntau tshaj 3,000 mais (4,800 km) mus rau Sargasso Hiav Txwv.
eels yug qhov twg?
Tus dej Hudson thiab lwm yam dej hauv New York yog tsev rau Asmeskas cov eel, tab sis nws tsis yog yug los ntawm no. Nws qhov chaw yug nyob hauv hiav txwv Sargasso, ib feem ntawm Dej Hiav Txwv Atlantic sab qab teb ntawm Bermuda. Los ntawm Sargasso Hiav Txwv, dej hiav txwv ntws nqa me nyuam eels mus rau ntug dej hiav txwv ntawm North America. Qhov kev mus ncig no siv sijhawm ntau lub hlis.
Australian eels mus yug qhov twg?
Eels hu ua catadromous - uas yog, lawv nyob hauv dej tshiab tab sis tsiv teb tsaws mus rau dej hiav txwv mus yug. Txhua xyoo cov neeg laus eels (paub tias lwm yam nyiaj eels) tsiv los ntawm ntug dej hiav txwv sab hnub tuaj ntawm Australia thiab New Zealand mus rau Coral Hiav Txwv, qhov uas nws xav tias lawv spawn ntawm qhov tob ntawm ib ncig ntawm 300m.
European eels yug nyob qhov twg?
Raws li cov ntses catadromous, European eels siv feem ntau ntawm lawv cov neeg laus nyob hauv dej ntshiab, kwj deg, thiab estuaries ua ntej rov qab mus rau dej hiav txwv qhib rau ntses thiab nteg qe. Raws li cov menyuam yaus, cov menyuam mos eels ya ncig hiav txwv tau li ntawm xya lub hlis txog peb xyoos.
eels reproduce li cas?
Coo ntxiv tias txoj kev xav ntawm cov eel reproduction yog tias lawv rov ua dua los ntawm external fertilization, nyob rau hauv cov huab ntawm cov phev fertilize dawb-floating qe.
