Bigeye tuna

 

 

 

Cov yam ntxwv nta:

Loj nruab nrab keel nrog 2 me keels ntawm ob sab ntawm caudal peduncle

23-31 Gill rakers ntawm thawj gill arch

8-10 dorsal finlets, 7-10 qhov quav finlets

Interpelvic txheej txheem nrog 2 flaps

Lub cev sib sib zog nqus, nws cov profile tsim ib puag ncig arc ntawm snout mus rau caudal peduncle

Qhov muag loj thiab elliptical nyob rau hauv cov duab

Pectoral fins long with pointed tips (in individuals >80 cm FL)

Caudal-fin posterior margin tiaj tus ntawm nruab nrab (vs. notched)

Ventral nto ntawm daim siab striated, lobes roughly sib npaug ntawm qhov ntev

Swimbladder loj thiab feem ntau inflated, occupying yuav luag tag nrho lub cev kab noj hniav

 

Xim:

Tsaus xiav-dub saum toj edged nrog ci iridescent xiav. Cov qauv tshiab tso saib cov kab kub uas khiav raws tag nrho lossis ib feem ntawm txoj kab tom qab. Ib kab ntawm cov kab dawb / nyiaj ntsug, tawg thiab tsis tiav kab feem ntau hauv qab kab nruab nrab ntawm kab thiab nyob rau hauv lub posterior ib nrab ntawm lub cev. Fins daj rau yellowish, qhov quav fin feem ntau tinged nrog nyiaj, caudal fin feem ntau dusky dub. Finlets ci daj nrog cov npoo dub.

Loj:

Txog li 250 cm TL thiab mus txog 210 kg hauv qhov hnyav.

 

Cov xwm txheej tseem ceeb thiab theem ntawm lub neej:

 

Me me / menyuam yaus (tsawg dua ~ 40 cm FL)

 

Cov mob tshiab

 

Tsawg dua tshiab rau qhov tsis zoo

 

 

Kev faib tawm:

tropical thiab temperate seas, circumglobally.

Saib FAO daim ntawv qhia kev faib khoom

Habitat:

Pelagic thiab dej hiav txwv. Pom nyob rau hauv qhov kub ntawm 13-29 degree thiab nyob rau hauv qhov tob ntawm qhov chaw mus rau 250 m.

 

Biology:

Pub rau ntau hom ntses, squid thiab crustaceans. Cov tsev kawm ntawv loj hauv tib hom lossis ntau hom kab xws li Katsuwonus pelamis lossis Thunnus albacares. Lub hnub nyoog ntawm thawj qhov kev loj hlob txawv ntawm thaj av, nyob rau sab hnub tuaj Indian dej hiav txwv thawj qhov kev loj hlob yog kwv yees li ntawm 2-3 xyoos, Ntev ntawm thawj qhov kev loj hlob yog kwv yees li ntawm 80 cm FL nrog kwv yees li 50% ua kom loj hlob ntawm 102-135 cm, sib npaug rau 3.5 xyoo. . Bigeye tuna yog ntau yam spawners, spawning txhua 1-2 hnub nyob rau ib lub hlis ntawm lub xyoo. Spawning tshwm sim nyob rau hauv cov dej kub thiab coincides nrog lub sij hawm ntawm lub hli⁵hla lawv tag nrho ntau yam, txawm tias feem ntau yog nyob rau sab hnub tuaj Pacific. Cov tsiaj no muaj txiaj ntsig zoo, ua rau kwv yees li 2.9-6.3 lab qe txhua qhov kev sib ntsib. Lub hnub nyoog siab tshaj plaws txawv ntawm cheeb tsam; 5 xyoo nyob rau sab hnub tuaj Pacific thiab 16 xyoo nyob rau sab hnub poob Pacific.