The P-39s (with P-38 / P-40s) were escorting B-17s looking for Jap destroyers in the Solomons, met by group of float biplanes most likely F1M "Pete"s from seaplane tenders; total claims 13 shot down.
If you are interested in the early Thirteenth AF operations this is Study 35; claims for Jan.43 are on p. 267 listing type. Almost half the claims were by F4Fs.
Regards
Nick
PS total 70FS claims (with 347FG) are on the French cieldegloire site and pp.565-566 in USAF Study 85 (official).
https://www.dafhistory.af.mil/Portal...090602-082.pdf