▁. ▁ ▁Description ▁The ▁great ▁sand ▁e el ▁has ▁an ▁el ong ated ▁body , ▁with ▁a ▁rounded ▁cross ▁section . ▁It ▁has ▁a ▁long , ▁pointed ▁head , ▁and ▁a ▁pro tr ud ing ▁lower ▁j aw . ▁Its ▁upper ▁j aw , ▁however , ▁is ▁not ▁pro tr us ible , ▁and ▁this ▁species ▁is ▁unable ▁to ▁form ▁a ▁t ube ▁with ▁its ▁mouth . ▁A ▁mon oc le ▁" to oth - sh aped " ▁structure ▁can ▁be ▁found ▁at ▁the ▁front ▁of ▁the ▁pal ate . ▁The ▁scales ▁on ▁the ▁body ▁cannot ▁form ▁a ▁che v ron ▁pattern . ▁The ▁skin ▁r idge ▁running ▁the ▁length ▁of ▁the ▁sides ▁of ▁the ▁body , ▁spread ▁as ▁far ▁as ▁one - third ▁of ▁the ▁base ▁of ▁the ▁anal ▁fin . ▁Low ▁and ▁long ▁set ▁d ors al ▁fins ▁consist ▁of ▁ 5 2 ▁to ▁ 6 1 ▁ray s . ▁The ▁anal ▁fin ▁is ▁about ▁half ▁the ▁size ▁of ▁the ▁d ors al ▁fin , ▁and ▁t aller . ▁The ▁p ector al ▁fins ▁are ▁dimin utive ; ▁the ▁pel vic ▁fins ▁are ▁absent . ▁Color ▁ranges ▁from ▁a ▁l ime ▁color ▁on ▁the ▁back ▁and ▁upper ▁sides ▁to ▁the ▁bright ▁silver ▁on ▁the ▁lower ▁sides ▁and ▁the ▁bel ly . ▁Also , ▁a ▁specific ▁black ▁sm ud ge ▁occurs ▁between ▁the ▁eyes ▁and ▁the ▁sn out , ▁which ▁is ▁about ▁the ▁same ▁size ▁as ▁the ▁diameter ▁of ▁the ▁eye . ▁ ▁The ▁great ▁sand ▁e el ▁can ▁be ▁distinguished ▁from