7 - 8 ▁d ors al ▁ray s , ▁ 9 - 1 0 ▁anal ▁ray s , ▁ 1 1 - 1 2 ▁p ector al ▁ray s , ▁and ▁ 6 ▁pel vic ▁ray s . ▁During ▁the ▁bre eding ▁season ▁males ▁develop ▁pr ick ly ▁contact ▁org ans ▁on ▁the ▁anal ▁fin . ▁The ▁L arg est ▁reported ▁spec imen ▁was ▁ 6 5 mm ▁( 2 . 6   in ) ▁long . ▁They ▁are ▁sex ually ▁dim orph ic . ▁Both ▁sex es ▁have ▁a ▁back ▁that ▁is ▁o live ▁green ▁with ▁a ▁thin ▁d ors al ▁stri pe , ▁sides ▁that ▁are ▁white ▁or ▁silver ▁with ▁an ▁ir ides cent ▁blue ▁or ▁sil very ▁overlay , ▁and ▁a ▁dark , ▁ir ides cent ▁blue - green ▁sub orb ital ▁te ard rop . ▁ ▁M ales ▁have ▁vertical ▁black ▁bars ▁and ▁irregular ▁horizontal ▁rows ▁of ▁red - b rown ▁sp ots . ▁Fem ales ▁have ▁horizontal ▁fl ank ▁stri pes . ▁F ins ▁have ▁a ▁re dd ish - b rown ▁color . ▁ ▁Diet ▁Although ▁not ▁much ▁is ▁known ▁about ▁its ▁bi ology , ▁the ▁bay ou ▁top min now ▁is ▁pres umed ▁to ▁feed ▁near ▁the ▁surface , ▁where ▁it ▁cons umes ▁dr ifting ▁organ ic ▁matter , ▁insect s , ▁and ▁other ▁animals ▁associated ▁with ▁the ▁water ▁surface . ▁ ▁Hab itat ▁Bay ou ▁top min n ows ▁occur ▁in ▁and ▁around ▁sh or eline ▁veget ation ▁of ▁clear ▁la kes ▁and ▁p onds