The peak season for tuna fishing off the coast of the Tsugaru Strait is from August to December. For longline fishing, the Minami Brothers mainly use over 100 live squid and mackerel as bait. A close look at the grueling work of tuna fishermen, who spend about 17 to 20 hours on almost no sleep from the time they set out to fish for bait until they return to the port after fishing for tuna.