| choose the feature that relates
to your fish |

first dorsal fin modified as a suction disk on top of the head |
dorsal fin preceded by one or more rays or spines unconnected by membranes |

small rayless adipose fin behind dorsal fin |

dorsal and caudal fins united, body tapering to a point |

single long dorsal fin without deep notch, not connected to caudal fin |

two dorsal fins separated by a distinct space |

single dorsal fin of short to medium length |

single elongate dorsal fin with deep notch or two dorsal fins not separated by a space |