There is another Colomesus species (there are only two in that genus), which is much larger, BW-SW (inshore and bay area feeder called Colomesus psittacus with which it gets confused, but to me they are not very similar. The other is much larger, BW at least, and up to a foot long, versus the ~3" for the SAP, Colomesus asellus. The scientific specimen for the SAP responsible for the inaccurate sizes commonly given for the smaller fish is apparently the larger species - but nobody has officially re-examined it and published on it. SAPs are really FW.
The other species is much less seen in the trade and so usually carries a higher price.
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Where's the fish? - Neptune
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