[1] The word is attested only here and in the scholia vetera to Aristophanes, Clouds 339. The scholiast treats kestre/a as a synonym of ke/stra (kappa 1429), both being first declension forms; but kestre/a appears to be a back-formation from kestre/as, the accusative plural of kestreu/s, and is not attested outside the scholion and the Suda. So it does not contribute to the distinction attempted. Accordingly, the Suda considers kestre/a as merely the feminine version of kestreu/s.
[2] alpha 4660; the word used there is kestre/wn, the genitive plural of kestreu/s. Though the kinds of fish discussed there are discussed together by Athenaeus, Deipnosophists 7.284F-285A (7.22 Kaibel), that does not make the mullet a kind of anchovy.