Kamasu barracuda
Kamasu and sanma are two fish in season now that we love to simply season with salt and grill.
Katsuo sashimi
Katsuo we love as sashimi, or if we find it in the market seared on the outside (tataki) we'll cut it into thick slices and garnish with garlic and ginger and serve with the sweet kanrō soy sauce from Kyushu.
Following are other seafood in season in September in Japan.
Amadai 赤甘鯛 tilefish (Branchiostegus japonicas)
Ayu 鮎 sweet fish (Plecoglossus altivelis)
Bora 鰡 flathead mullet or Gray mullet (Mugil cephalus)
Chidai 血鯛 crimson sea bream (Evynnis japonica)
Hon kamasu 本カマス barracuda (Sphyraena pinguis)
Ibodai疣鯛 Japanese butterfish (Psenopsis anomala)
Isaki 伊佐木threeline grunt (Parapristipoma trilineatum)
Itoyori イトヨリGolden threadfin bream (Nemipterus virgatus)
Katsuo 鰹 skipjack tuna or oceanic bonito (Katsuwonus pelamis)
Kohada 小鰭 gizzard shad (Konosirus pumctatus)
Kurumaebi 車海老 Japanese tiger prawn (Marsupenaeus japonicas)
Maaji 真鯵 horse mackerel (Trachurus japonicas)
Masaba真鯖 pacific mackerel (Scomber japonicus)
Sanma 秋刀魚 Pacific saury (Cololabis saira)
Shirosake 白鮭 chum salmon (Oncorhynchus keta)
Sujiko筋子 salmon roe still in the sac
Surume ika スルメイカJapanese flying squid (Todarodes pacificus)
Takabe タカベ yellow-striped butterfish (Labracoglossa argentiventris)
Warasaワラサ yellowtail (Seriola quinqueradiata)
Watarigani 渡蟹 swimming crab (Portunus trituberculatus)
Other fish you may see in the market
Ainame 鮎魚女fat greenling (Hexagrammos otakii)
Akagai 赤貝 ark shell (Scapharca broughtonii)
Asari 浅利 Japanese littleneck clams (Ruditapes philippinarum)
Hotate 帆立貝 scallops (Patinopecten yessoensis)
Hoya ホヤ sea squirt (Halocynthia roretzi)
Kinki 黄血魚 thornyhead (Sebastolobus macrochir)
Kinmedai or kinme 金目鯛 splendid alfonsino (Beryx splendens)
Kihada maguro 黄肌鮪 yellowfin tuna (Thunnus albacares)
Makarei 真鰈 Japanese common flounder (Pleuronectes yokohamae)
Madai 真鯛 seabream (Pagurus major)
Mirugai 海松食 geoduck (Tresus keenae)
Mebaru 目張 rockfish (Sebastes inermis)
Sawara 鰆 Japanese Spanish mackerel (Scomberomorus niphonius)
Sazae 栄螺 turban shell (Turbo cornutus)
Tairagai 平貝 penshell (Atrina (Servatrina) pectinata)
Tachiuo 太刀魚 belt fish or largehead hairtail (Trichiurus lepturus)
Tsubugai 螺貝 whelk (Buccinum undatum)
Tobiuo 飛魚 flying fish (Cypselurus agoo agoo)