us ▁le ia can th us ▁H . ▁H . ▁Ng ▁& ▁K ott el at , ▁ 1 9 9 8 ▁ ▁H yal ob agr us ▁orn atus ▁( D un cker , ▁ 1 9 0 4 ) ▁ ▁Distribution ▁H yal ob agr us ▁species ▁are ▁distributed ▁in ▁Asia . ▁ ▁Description ▁These ▁cat fish ▁species ▁are ▁small ▁and ▁transparent . ▁The ▁three ▁species ▁can ▁be ▁distinguished ▁by ▁differences ▁in ▁body ▁shape , ▁color ation , ▁and ▁the ▁degree ▁of ▁ser r ations ▁on ▁the ▁anterior ▁edge ▁of ▁the ▁p ector al ▁fin ▁sp ine . ▁The ▁three ▁species ▁range ▁from ▁about ▁ 3 – 4 . 4   cent imet res ▁( 1 . 2 – 1 . 7   in ) ▁SL . ▁ ▁H yal ob agr us ▁species ▁are ▁sex ually ▁dim orph ic , ▁males ▁possess ▁a ▁gen ital ▁pap illa , ▁and ▁grav id ▁females ▁are ▁easy ▁to ▁spot ▁since ▁their ▁blue - green ▁eggs ▁are ▁visible ▁through ▁their ▁bel lies . ▁ ▁E col ogy ▁These ▁cat fish ▁are ▁mid - water ▁sw imm ers . ▁They ▁are ▁also ▁school ing ▁fish . ▁In ▁their ▁natural ▁habitat , ▁they ▁are ▁almost ▁always ▁found ▁closely ▁associated ▁with ▁sub mer ged ▁veget ation . ▁ ▁In ▁the ▁aqu arium ▁H . ▁flav us ▁and ▁H . ▁orn atus ▁are ▁known ▁to ▁be ▁export ed ▁for ▁the ▁aqu arium ▁trade . ▁H . ▁flav us ▁first ▁appeared ▁in ▁the ▁h ob by ▁in ▁the ▁