Blue mackerel - Scomber australasicus

Cov yam ntxwv nta:

2 me me keels ntawm ob sab ntawm caudal peduncle

Cov hniav muaj nyob ntawm lub ru tsev ntawm lub qhov ncauj

Adipose eyelids npog pem hauv ntej thiab nram qab ntawm lub qhov muag

10-13 dorsal fin spines

Qhov thib ob dorsal fin anterior ntawm qhov quav fin

Thawj qhov anal-fin txha nraub qaum txhav thiab muaj zog

Xim:

Blueish ntsuab saum toj no nrog ntau oblique wavy tsaus kab, pearl dawb hauv qab nrog wavy, tawg kab muab faintly speckled tsos.

Loj:

Txog li 45 cm TL, thiab mus txog 1.4 kg hauv qhov hnyav.

Kev faib tawm:

Indo-Pacific nyob rau hauv subtropical dej.

Habitat:

Epipelagic, pom nyob rau hauv qhov tob ntawm 87-200 m.

Biology:

Pub feem ntau ntawm plankton los ntawm kev lim cov crustaceans me me xws li copepods tsim cov kab dej. Cov neeg laus kuj pub ntses me me thiab squid. Tsim cov tsev kawm ntawv loj nrog cov ntses me me xws li lwm cov mackerel thiab sardine. Hom no qhia txog keeb kwm ntawm lub neej tsis sib xws nyob ntawm qhov chaw. Hauv tebchaws Australia, lub hnub nyoog ntawm thawj qhov kev loj hlob yog kwv yees li ntawm 2 xyoos,¹ thiab ntev qhov twg 50% ntawm cov tib neeg ua kom loj hlob yog kwv yees li ntawm 28.6 thiab 23.6 cm FL rau cov poj niam thiab cov txiv neej feem.²Nyob rau hauv Nyiv, xiav mackerel loj dua 31.0 cm FL raug suav hais tias mature.3 Hom no loj dua thiab nyob ntev dua hauv New Zealand, maturing ntawm 3 xyoos, sib xws rau 28 cm FL,⁴thiab muaj hnub nyoog kwv yees siab tshaj plaws ntawm 24 xyoo.⁵Blue mackerel yog batch spawners, nrog rau lub sij hawm spawning txawv nrog qhov chaw. Nyob rau hauv cov dej tawm sab qab teb Australia, spawning tshwm sim thaum lub Kaum Ib Hlis thiab Plaub Hlis, nrog kev sib kis ntau zaus ntawm 2-11 hnub. Cov poj niam muaj peev xwm tsim tau ~ 70, 000 qe ib batch.²