Ntses salmon nyob li cas

2024 Tus sau: Henry Conors | [email protected]. Kawg hloov kho: 2024-02-12 07:47

Salmon ntses yog tsev neeg nkaus xwb nyob rau hauv lub salmon suborder. Ntawm lawv muaj ob qho tib si dej qab zib thiab anadromous hom. Ntawm cov no, feem ntau yog: salmon, chum salmon, liab salmon, coho salmon, sockeye salmon, chinook salmon, whitefish, xim av trout, greyling, omul, char, taimen thiab lenok. Feem ntau ntawm cov ntses no raug xa mus los ntawm cov npe sib sau ua ke: trout thiab salmon.

Keeb Kwm

Salmon ntses tau tshwm sim li 145 lab xyoo dhau los. Nyob rau hauv cov qauv thiab cov duab, lawv zoo ib yam li herring, thiab nyob rau hauv ib co kev faib tawm lawv txawm ua ke. Tab sis cov ntses salmon tuaj yeem yooj yim txawv los ntawm ib txoj kab zoo kos rau ntawm lub cev. Kev faib tsev neeg mus rau niaj hnub hom tshwm sim 62-25 lab xyoo dhau los.

Qhov txawv ntawm

Ntses ntawm tsev neeg salmon tuaj yeem muaj lub cev ntev ntawm ob peb centimeters (piv txwv li, ntses dawb) mus txog ob meters, thiab lawv qhov hnyav tuaj yeem ncav cuag xya caum kilograms (taimen, salmon, chinook).

Cov ntaub ntawv muaj tseeb hauv qhov loj yog taimen. Cov ntses no ntawm tsev neeg salmon tuaj yeem nyobntau tshaj li tsib caug xyoo, muaj qhov hnyav ntawm ib puas kilograms, qhov ntev ntawm ntau tshaj ob thiab ib nrab meters. Lub cev ntev thiab nqaim, npog nrog cov nplais puag ncig.

Tag nrho cov ntses salmon muaj ib lub dorsal fin thiab ib tug adipose fin qab nws.

Reproduction

Lub neej expectancy nyob rau hauv ib co tsiaj muaj peev xwm mus txog kaum tsib xyoos.

Lawv tuaj yeem tsim dua tshiab hauv dej tshiab. Nyob rau tib lub sijhawm, qee hom tsiaj nyob tas li nyob hauv pas dej, tab sis feem ntau ntawm lawv nce mus rau spawn los ntawm cov dej qab ntsev mus rau cov tshiab. Feem ntau lawv rov qab mus rau tib qhov chaw uas lawv yug los. Tseem tsis paub xyov lawv nrhiav tau lawv tus dej li cas tiag. Tej zaum yog lub cev saum ntuj ceeb tsheej thiab cov hnub qub ci ntsa iab, lossis los ntawm saj ntawm cov dej thiab cov yam ntxwv zoo tshaj plaws ntawm nws cov muaj pes tsawg leeg.

Thaum yug me nyuam, ntses salmon hloov lawv cov duab thiab xim (tso rau "kev sib yuav khaub ncaws").

Raws li twb tau hais lawm, kev yug ntses salmon tsuas yog tshwm sim hauv cov dej tshiab - hauv cov kwj dej, dej ntws los yog pas dej. Qhov no yog vim qhov tseeb tias lawv cov poj koob yawm txwv yog cov dej tsis qab, thiab tsuas yog qee tus ntawm lawv cov xeeb leej xeeb ntxwv tau hloov mus ua cov ntses anadromous - cov no yog Atlantic thiab Pacific salmon.

Ntau hom tsuas yog yug ib zaug hauv lawv lub neej ces tuag. Qhov no yog qhov ntau dua rau Pacific salmon, tab sis Atlantic salmon tuaj yeem loj hlob mus txog plaub zaug.

Ua ntej txheej txheem no, cov ntses salmon hloov pauv ntau yam ntawm sab nraud thiab sab hauv. Cov xim ntawm cov nyiaj hloov mus rau xim liab-dub, hauv txiv neej qee zaumib tug hump yuav tshwm sim, cov hniav yuav loj dua. Tab sis yuav luag tag nrho cov hauv nruab nrog cev degrade, nqaij yuav tsis elastic thiab, vim li ntawd, tsis muaj nuj nqis.

Chaw

Feem ntau salmon nyob rau sab qaum teb Hemisphere. Lawv feem ntau tshwm sim hauv North Asia, Europe, North America, thiab tseem nyob hauv toj siab ntawm North Africa. Nyob rau yav qab teb Hemisphere, tsev neeg no tsis nyob hauv nws qhov chaw nyob, tab sis nyob rau qee qhov chaw lawv tau ua kom zoo dua qub thiab bred.

Nuv ntses

Lawv cov nqaij muaj tus cwj pwm saj thiab muaj txiaj ntsig zoo heev, yog li txhua hom ntses ntses yog khoom siv nuv ntses. Lawv muab tau li peb feem pua ntawm tag nrho cov ntses hiav txwv ntes tau.