This list shows all catfish common names beginning with the letter O.

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1.	Obbes' Tandan	Porochilus obbesi	(i: 4, k: 2)
2.	Ocellated Synodontis	Synodontis ocellifer	(i: 11, k: 76)
3.	Ogre Catfish	Asterophysus batrachus	(i: 15, k: 27)
4.	Ohrgitter-Harnischwels (German, Germany)	Otocinclus vestitus	(i: 4, k: 51)
5.	Ohrgitter-Harnischwels (German, Germany)	Otocinclus affinis	(i: 2, k: 57)
6.	Ohrgitter-Harnischwels (German, Germany)	Otocinclus hoppei	(i: 7, k: 34)
7.	Ohrgitter-Harnischwels (German, Germany)	Otocinclus hasemani	(i: 0, k: 1)
8.	Ohrgitterharnischwels (German, Germany)	Otocinclus vittatus	(i: 28, k: 271)
9.	Oil Catfish	Duringlanis perugiae	(i: 26, k: 131)
10.	Oilspotted Pleco	Peckoltia sp. (L478)	(i: 1, k: 1)
11.	Olga Cory	Corydoras simulatus	(i: 13, k: 26)
12.	Oliefinnepansermalle (Danish, Denmark)	Corydoras (lineage 9) punctatus	(i: 7, k: 25)
13.	Olieplettet Sugemalle (Danish, Denmark)	Peckoltia sp. (L478)	(i: 1, k: 1)
14.	Olive Cory	Corydoras (lineage 5) sp. (Cw019)	(i: 2, k: 3)
15.	Oliven Kaktussugemalle (Danish, Denmark)	Pseudacanthicus pitanga	(i: 20, k: 110)
16.	Oliven-pansersugemalle (Danish, Denmark)	Parancistrus sp. (L332)	(i: 2, k: 2)
17.	Olivenpansermalle (Danish, Denmark)	Corydoras (lineage 5) sp. (Cw019)	(i: 2, k: 3)
18.	One Spot Pangasius	Pangasius larnaudii	(i: 7, k: 7)
19.	Opal Cory	Corydoras (lineage 8 sub-clade 4) sp. (Cw013)	(i: 1, k: 1)
20.	Opal Spot Pleco	Scobinancistrus raonii	(i: 31, k: 61)
21.	Opalpansermalle (Danish, Denmark)	Corydoras (lineage 8 sub-clade 4) sp. (Cw013)	(i: 1, k: 1)
22.	Opalplettet Sugemalle (Danish, Denmark)	Scobinancistrus raonii	(i: 31, k: 61)
23.	Orange Banded Cory	Corydoras (lineage 8 sub-clade 4) sp. (Cw117)	(i: 3, k: 0)
24.	Orange Banded Hillstream Catfish	Akysis vespa	(i: 6, k: 20)
25.	Orange Banded Stone Catfish	Akysis vespa	(i: 6, k: 20)
26.	Orange Black Pleco	Ancistrini sp. (L069)	(i: 1, k: 3)
27.	Orange Catfish	Lophiosilurus fowleri	(i: 29, k: 8)
28.	Orange Catfish	Lophiosilurus apurensis	(i: 42, k: 14)
29.	Orange Cheek Pinecone Pleco	Pseudorinelepis sp. (L095)	(i: 14, k: 50)
30.	Orange Cory	Corydoras (lineage 8 sub-clade 4) sp. (Cw113)	(i: 1, k: 1)
31.	Orange Fin Bristlenose	Ancistrus sp. (L369)	(i: 0, k: 3)
32.	Orange Fin Bristlenose	Ancistrus sp. (L371)	(i: 0, k: 1)
33.	Orange Finned Oyapok Pleco	Peckoltia sp. (L061)	(i: 1, k: 4)
34.	Orange Lane Pleco	Hypostomus sp. (L222)	(i: 0, k: 1)
35.	Orange Seam Ghost Pleco	Ancistomus cf. snethlageae	(i: 4, k: 5)
36.	Orange Seam Pleco	Peckoltia sp. (L076)	(i: 28, k: 43)
37.	Orange Spot Pleco	Panaqolus albomaculatus	(i: 24, k: 125)
38.	Orange Spotted Bristlenose	Ancistrus hoplogenys	(i: 8, k: 43)
39.	Orange Stripe Cory	Corydoras (lineage 7) sp. (Cw014)	(i: 14, k: 82)
40.	Orange Striped Squeaker	Synodontis flavitaeniatus	(i: 14, k: 62)
41.	Orange Sugemalle (Danish, Denmark)	Hypostomus jaguribensis	(i: 22, k: 2)
42.	Orange Tiger Pleco	Peckoltia wernekei	(i: 7, k: 17)
43.	Orange Tigersugemalle (Danish, Denmark)	Peckoltia wernekei	(i: 7, k: 17)
44.	Orange-pattern Pleco	Hemiancistrus votouro	(i: 0, k: 1)
45.	Orangebåndet Pansermalle (Danish, Denmark)	Corydoras (lineage 8 sub-clade 4) sp. (Cw117)	(i: 3, k: 0)
46.	Orangefin Madtom	Noturus gilberti	(i: 1, k: 1)
47.	Orangefinnet Antennesugemalle (Danish, Denmark)	Ancistrus sp. (L369)	(i: 0, k: 3)
48.	Orangefinnet Antennesugemalle (Danish, Denmark)	Ancistrus sp. (L371)	(i: 0, k: 1)
49.	Orangefinnet Giftmalle (Danish, Denmark)	Noturus gilberti	(i: 1, k: 1)
50.	Orangefinnet Oyapok-sugemalle (Danish, Denmark)	Peckoltia sp. (L061)	(i: 1, k: 4)
51.	Orangefinnet Pansermalle (Danish, Denmark)	Corydoras (lineage 8 sub-clade 4) seussi	(i: 9, k: 33)
52.	Orangefinnet Spøgelsessugemalle (Danish, Denmark)	Ancistomus cf. snethlageae	(i: 4, k: 5)
53.	Orangehalet Halvfinnesugemalle (Danish, Denmark)	Lasiancistrus sp. (L479)	(i: 2, k: 2)
54.	Orangekindet Koglesugemalle (Danish, Denmark)	Pseudorinelepis sp. (L095)	(i: 14, k: 50)
55.	Orangemønstret Sugemalle (Danish, Denmark)	Hemiancistrus votouro	(i: 0, k: 1)
56.	Orangepandet Pansermalle (Danish, Denmark)	Corydoras (lineage 9) adolfoi	(i: 12, k: 192)
57.	Orangeplettet Prinsesugemalle (Danish, Denmark)	Panaqolus albomaculatus	(i: 24, k: 125)
58.	Orangepletttet Antennesugemalle (Danish, Denmark)	Ancistrus hoplogenys	(i: 8, k: 43)
59.	Orangerandet Sugemalle (Danish, Denmark)	Hemiancistrus guahiborum	(i: 15, k: 87)
60.	Orangesort Sugemalle (Danish, Denmark)	Ancistrini sp. (L069)	(i: 1, k: 3)
61.	Orangesømmet Sugemalle (Danish, Denmark)	Peckoltia sp. (L076)	(i: 28, k: 43)
62.	Orangestiplet Paru-sugemalle (Danish, Denmark)	Hypostomus sp. (L222)	(i: 0, k: 1)
63.	Orangestiplet Sugemalle (Danish, Denmark)	Leporacanthicus triactis	(i: 21, k: 198)
64.	Orangestribet Pansermalle (Danish, Denmark)	Corydoras (lineage 7) sp. (Cw014)	(i: 14, k: 82)
65.	Orangestribet Skægmalle (Danish, Denmark)	Synodontis flavitaeniatus	(i: 14, k: 62)
66.	Orangetailed Halffin Pleco	Lasiancistrus sp. (L479)	(i: 2, k: 2)
67.	Orca Cory	Corydoras desana	(i: 2, k: 1)
68.	Oregon Fossil Catfish	†Hypsidoris oregonensis	(i: 1, k: 1)
69.	Oremon Catfish	Lophiosilurus fowleri	(i: 29, k: 8)
70.	Orinoco Angel Pleco	Hypancistrus sp. (L201)	(i: 17, k: 414)
71.	Orinoco Bristlenose	Ancistrus sp. (L125)	(i: 1, k: 9)
72.	Orinoco Butterfly Pleco	Dekeyseria picta	(i: 49, k: 361)
73.	Orinoco Galaxy Pleco	Leporacanthicus cf. galaxias(l240)	(i: 24, k: 146)
74.	Orinoco Pinecone Pleco	Pseudorinelepis sp. (L152)	(i: 2, k: 17)
75.	Orinoco Polka-dot Pleco	Hypancistrus contradens	(i: 26, k: 165)
76.	Orinoco Sailfin Catfish	Pterygoplichthys multiradiatus	(i: 2, k: 13)
77.	Orinoco Talking Catfish	Orinocodoras eigenmanni	(i: 13, k: 29)
78.	Orinoco Tiger Pleco	Peckoltia sp. (L103)	(i: 1, k: 10)
79.	Orinoco-antennesugemalle (Danish, Denmark)	Ancistrus sp. (L125)	(i: 1, k: 9)
80.	Orinoco-englesugemalle (Danish, Denmark)	Hypancistrus sp. (L201)	(i: 17, k: 414)
81.	Orinoco-tigersugemalle (Danish, Denmark)	Peckoltia sp. (L103)	(i: 1, k: 10)
82.	Orituco Harlequin Whiptail	Loricaria sp. `RIO ORITUCO`	(i: 5, k: 1)
83.	Ormesnudet Pansermalle (Danish, Denmark)	Corydoras sp. (Cw073)	(i: 2, k: 1)
84.	Ormestribet Pansermalle (Danish, Denmark)	Corydoras (lineage 8 sub-clade 4) sp. (Cw040)	(i: 3, k: 1)
85.	Ormestribet Sugemalle (Danish, Denmark)	Parancistrus sp. (LDA046)	(i: 7, k: 8)
86.	Ornate Bagrid	Chrysichthys ornatus	(i: 8, k: 27)
87.	Ornate Cory	Corydoras (lineage 8 sub-clade 4) sp. (C152)	(i: 0, k: 1)
88.	Ornate Cory	Corydoras (lineage 8 sub-clade 4) ornatus	(i: 3, k: 6)
89.	Ornate Halffin Pleco	Lasiancistrus sp. (L386)	(i: 0, k: 0)
90.	Ornate Pimelodus	Pimelodus ornatus	(i: 21, k: 31)
91.	Ornate Rubbernose	Chaetostoma sp. (L455)	(i: 24, k: 9)
92.	Ornate Shadow Catfish	Hyalobagrus ornatus	(i: 3, k: 9)
93.	Orocue Cory	Corydoras (lineage 9) esperanzae	(i: 3, k: 1)
94.	Orocue-pansermalle (Danish, Denmark)	Corydoras (lineage 9) esperanzae	(i: 3, k: 1)
95.	Oto	Otocinclus vittatus	(i: 28, k: 271)
96.	Oto	Otocinclus sp. (1)	(i: 3, k: 23)
97.	Oto	Otocinclus macrospilus	(i: 11, k: 83)
98.	Oto	Otocinclus mariae	(i: 5, k: 40)
99.	Otocinclus Negros (German, Germany)	Otothyropsis piribebuy	(i: 13, k: 21)
100.	Otorongo Woodcat	Spinipterus moijiri	(i: 14, k: 17)
101.	Ouachita Madtom	Noturus lachneri	(i: 1, k: 1)
102.	Ovalplettet Pansermalle (Danish, Denmark)	Corydoras (lineage 8 sub-clade 2) sp. (C057)	(i: 3, k: 3)
103.	Oyapok Hook Fin Pleco	Harttia sp. (L053)	(i: 1, k: 0)
104.	Oyapok-krogfinnesugemalle (Danish, Denmark)	Harttia sp. (L053)	(i: 1, k: 0)
105.	Ozark Madtom	Noturus albater	(i: 1, k: 1)
106.	Ozark-giftmalle (Danish, Denmark)	Noturus albater	(i: 1, k: 1)
107.	Ozelotsugemalle (Danish, Denmark)	Megalancistrus sp. (L234)	(i: 9, k: 8)