I might do a few jack specific trips during the summer months but the largest quantity of jacks I get a bycatch when fishing for something else....
Typically nearly all of my best jacks are from May and June as bycatch when targetting jew...Lots of smaller models in October to February.
Last jack I got was 3 weeks ago in cabo river whilst looking for jew.....3 jacks in 35 minutes. Best one was 46cm.