Ca bien khoi, ca khoi xa hay ca noi la nhung loai ca bien song trong vung ngoai khoi cua bien, nghia la cac tang nuoc khong gan voi đay nhung cung khong gan bo - trai nguoc voi ca đay bien hay cac loai ca ran san ho ma moi truong sinh song cua chung gan chat voi cac ran san ho. Cac loai ca bien khoi la đoi tuong quan trong trong nganh khai thac thuy san đanh bat xa bo, trai nguoc voi hinh thuc đanh bat gan bo đoi voi nhung loai ca ven bien. Nhieu loai ca bien khoi thuong co kich thuoc lon, so luong nhieu, gia tri dinh duong cao va la nhung loai co gia tri kinh te. Nhom ca noi lon song chu yeu o vung bien khoi va thuong o tang mat, co hien tuong di cu xa. Nhom ca noi lon hien nay la đoi tuong khai thac chinh cua nghe ca xa bo, co gia tri kinh te cao va la đoi tuong xuat khau quan trong.


Tong quan Moi truong song gan bien hay moi bien la moi truong song thuy san, hai san lon nhat the gioi, chiem 1,370 trieu kilomet khoi (330 trieu dam khoi), va la moi truong song cho 11% cac loai ca đuoc biet đen. Cac đai duong co đo sau trung binh 4000 met. Khoang 98% tong luong nuoc duoi 100 met, va 75% la duoi 1000 met. Ca bien bien co the đuoc chia thanh ca ven bien va ca bien đai duong. Ca ven bien song trong vung nuoc tuong đoi nong va ngap nang tren them luc đia, trong khi ca đai duong song trong vung nuoc rong lon va sau xa hon them luc đia, nhung chung cung co the boi gan bo.
Tang noi la pham vi ca co kich thuoc tu ca nho ven bien nhu ca thuc pham chang han nhu ca trich, ca moi, đe đong vat an thit cac loai ca đai duong lon, chang han nhu ca ngu vay xanh phuong Nam va ca map đai duong. Chung thuong đuoc đac trung boi kha nang boi loi nhanh nhen voi cac co quan cau tao co the đuoc sap xep hop ly tao kha nang duy tri boi ve su di cu đuong dai. Ca co An Đo-Thai Binh Duong, mot loai ca noi đai duong, co the boi nuoc rut hon 110 km moi gio. Mot so loai ca ngu hanh trinh qua Thai Binh Duong. Nhieu ca bien boi trong cac lan song ca co trong luong hang tram tan. Nhung loai khac la đon đoc.


Cac loai Ngoai pham vi 20 hai ly o bien thi co cac loai ca bien an noi, ca bien ran san ho nhu ca mu, ca song hay ca nuc, on co nhieu loai ca, hai san khac co gia tri lon sinh song nhu cac loai ca dua gang, ca o, ca thu, ca hong, ca ngu đai duong, ca đuoi, ca hanh, ca lat, Cac loai ca song o ngoai 20 hai ly pho bien nhu ca nuc, ca dua gang, ca o... thuong đuoc đanh bat theo đan voi so luong lon. Đoi voi cac loai ca ngoai khoi nay, so luong mot đan co the len toi vai tan. Đac biet, ca ngu khong the song o pham vi cach bo trong vong 50 hai ly.
Cac loai hai san kinh te thuong gap o vung bien xa bo

Ca Ven bien (Brama orcini)
Ca Chim đen (Parastromateus niger)
Ca Ngan (Atule mate): kich thuoc tu 17 cm tro len
Ca khe vay lung đen (Carangoides melanoptera)
Ca Nuc đo đuoi (Decapterus kurroides)
Ca Nuc thuon (Decapterus macrosoma): kich thuoc tu 17 cm tro len
Ca Nuc so (Decapterus maruadsi): kich thuoc tu 17 cm tro len
Ca Song gio (Megalaspis cordyla)
Ca Trao mat to (Selar crumenophthalmus)
Ca Cam (Seriola dumerili)
Ca Cu cam (Seriolina nigrofasciata)
Ca Map (Carcharhinus sorrah)
Ca Chim gai (Psenopsis anomala)
Ca Lanh/Ca rua (Chirocentrus dorab)
Ca Nuc heo (Coryphaena hippurus)
Ca Gia thu (Lepidocybium flavobrunneum)
Ca Co la (Istiophorus platypterus)
Ca Co đen (Makaira indica)
Ca Co xanh (Makaira mazara)
Ca Ro bien (Lobotes surinamensis)
Ca ban chan (Lophiomus setigerus)
Ca Đong sop (Pristipomoides multidens)
Ca đau vuong (Branchiostegus argentatus)
Ca Bo 1 gai (Aluterus monoceros)
Ca Đuoi doi (Mobula japanica)
Ca Luong sau (Nemipterus bathybius)
Ca Luong dai vay đuoi (Nemipterus virgatus)
Ca Luong doi (Scolopsis taeniopterus)
Ca Chim 2 vay (Cubiceps baxteri)
Ca Trac ngan (Priacanthus macracanthus)
Ca Trac dai (Priacanthus tayenus)
Ca Gio (Rachycentron canadum)
Ca Đu đau to (Pennahia macrocephalus)
Ca Thu ngang (Acanthocybium solandri)
Ca Ngu chu (Auxis thazard)
Ca Ngu cham (Euthynnus affinis)
Ca Bac ma (Rastrelliger kanagurta)
Ca Thu Nhat (Scomber japonicus)
Ca Thu vach (Scomberomorus commerson)
Ca Thu cham (Scomberomorus guttatus)
Ca Ngu vay vang (Thunnus albacares)
Ca Ngu mat to (Thunnus obesus)
Ca Ngu soc dua (Katsuwonus pelamis)
Ca Nhong (Sphyraena barracuda)
Ca Nhong vang (Sphyraena obtusata)
Ca Moi ngan, vay day (Saurida elongata)
Ca Moi thuong, vay to (Saurida tumbil): kich thuoc tu 17 cm tro len
Ca Moi vach (Saurida undosquamis): kich thuoc tu 17 cm tro len
Ca Moi hoa (Trachinocephalus myops): kich thuoc tu 15 cm tro len
Ca Ho đau rong (Trichiurus lepturus)
Ca Xem sao (Uranoscopus oligolepis)
Ca Kiem (Xiphias gladius)
Muc xa (Symplectoteuthis oualaniensis)
Muc nang mat cao (Sepia lycidas)
Muc nang van ho (Sepia pharaonis)
Muc ong (Loligo chinensis)


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