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- Alestes humilis
- Alestes longipinnis
- Alestidae
- Alestopetersius caudalis
- Alestopetersius smykalai
- Alfaro cultratus
- Alfaro huberi
- Alga shrimp
- Algae
- Algae-eating Shrimp
- Algae-eating shrimp
- Algae Balls
- Algae Shrimp
- Algae bloom
- Algae eater
- Algae eaters
- Algae pellets
- Algae shrimp
- Algae tablets
- Algaecide
- Aliger gigas
- Alkaia Loach
- Alkaline
- Alkalinity
- Alkalophiles
- Allelopathy
- Allenbatrachus grunniens
- Alligator Gar
- Alligator Pleco
- Alligator Weed
- Allodontichthys hubbsi
- Allogalathea elegans
- Alluaud's Haplo
- Alluaud's Walking Catfish
- Almoloya Cichlid
- Almorha Loach
- Almorha loach
- Aloe vera
- Alpheus bellulus
- Alternanthera aquatica
- Alternanthera reineckii
- Alticorpus macrocleithrum
- Alticorpus mentale
- Alticorpus peterdaviesi
- Alticorpus profundicola
- Altifrons Cichlid
- Altolamprologus calvus
- Altolamprologus compressiceps
- Altum Angel
- Altum Angelfish
- Aluminium Catfish
- AmQuel+
- AmQuel Plus
- Amamoto Shrimp
- Amanda Cory
- Amano
- Amano Shrimp
- Amano shrimp
- Amaralia hypsiura
- Amaranth
- Amarginops ornatus
- Amatitlania sajica
- Amazon Frogbit
- Amazon Knifefish
- Amazon Leaffish
- Amazon Puffer
- Amazon Sailfin Pleco
- Amazon Sword Melt
- Amazonas
- Ambassidae
- Ambassis agrammus
- Ambassis commersoni
- Ambloplites rupestris
- Amblyceps mangois
- Amblycipitidae
- Amblydoras hancocki
- Amblyeleotris guttata
- Amblyeleotris randalli
- Amblyeleotris wheeleri
- Amblygobius albimaculatus
- Amblygobius phalaena
- Amblygobius rainfordi
- Amblygobius semicinctus
- Amblypharyngodon mola
- Ambystoma mexicanum
- Ameca splendens
- Ameiurus melas
- Ameiurus natalis
- Ameiurus nebulosus
- American-Flag Fish
- American Cichlid Association
- American Eel
- American Fish International
- American Flag Fish
- American Flagfish
- American Freshwater Eel
- American Killifish Association
- American Paddlefish
- American Pondweed
- American Toad
- American Water Weed
- American Waterweed
- Amia calva
- Amiidae
- Amiiformes
- Ammannia gracilis
- Ammannia latifolia
- Ammonia
- Ammonia oxidising bacteria
- Ammonium
- Amphibian
- Amphibians
- Amphidromous
- Amphiliidae
- Amphilius platychir
- Amphilophus alfari
- Amphilophus calobrensis
- Amphilophus citrinellum
- Amphilophus citrinellus
- Amphilophus flaveolus
- Amphilophus labiatus
- Amphilophus lyonsi
- Amphilophus macracanthus
- Amphilophus nourissati
- Amphiprion akallopisos
- Amphiprion bifasciatus
- Amphiprion bifasciatus annamensis
- Amphiprion chagoensis
- Amphiprion chagosensis
- Amphiprion chrysopterus
- Amphiprion clarkii
- Amphiprion ephippium
- Amphiprion frenatus
- Amphiprion intermedius
- Amphiprion latezonatus
- Amphiprion laticlavius
- Amphiprion mccullochi
- Amphiprion melanopus
- Amphiprion ocellaris
- Amphiprion percula
- Amphiprion perideraion
- Amphiprion polymnus
- Amphiprion polymus
- Amphiprion polynemus
- Amphiprion rubrocinctus
- Amphiprion sandaracinos
- Amphiprion tricinctus
- Amphiprion trifasciatus
- Amplexidiscus fenestrafer
- Amplexus
- Amquel
- Amquel+
- Amquel plus
- Amquelplus
- Amur Catfish
- Amur False Gudgeon
- Anabantidae
- Anabantids
- Anabantoid
- Anabantoid Association of Great Britain
- Anabantoids
- Anabas testudineus
- Anablepidae
- Anableps anableps
- Anacharis
- Anacropora forbesi
- Anadoras grypus
- Anaerobe
- Anaerobic
- Anal
- Anal fin
- Anaspidoglanis macrostoma
- Anatolia Killifish
- Anchariidae
- Anchialine Shrimp
- Anchor Catfish
- Anchor Worm
- Anchor worms
- Ancistomus cf snethlageae
- Ancistomus feldbergae
- Ancistomus snethlageae
- Ancistomus sp "L147"
- Ancistrini sp "L016"
- Ancistrini sp "L069"
- Ancistrini sp "L082"
- Ancistrini sp "L127"
- Ancistrus claro
- Ancistrus dolichopterus
- Ancistrus hoplogenys
- Ancistrus macrophthalmus
- Ancistrus pirareta
- Ancistrus ranunculus
- Ancistrus sp
- Ancistrus sp.
- Ancistrus sp "L107"
- Ancistrus sp "L255"
- Ancistrus sp "L393"
- Ancistrus sp (L393)
- Ancistrus tamboensis
- Ancistrus triradiatus
- Andaman Foxface
- Andean Catfish
- Andinoacara stalsbergi
- Andropodium
- Anemone Demoiselle
- Anemonefish
- Anentome helena
- Angel
- Angel Catfish
- Angel Squeaker
- Angel fish
- Angelfish
- Angelic Synodontis
- Angelicus
- Angelicus Cat
- Angelicus Loach
- Angelicus Pleco
- Angels
- Angle fish
- Angler Catfish
- Anglespot River Stingray
- Angolan Barb
- Anguila Eel
- Anguilla rostrata
- Anguillidae
- Anguilliformes
- Annandale Loach
- Annularis Angelfish
- Anodonta anatina
- Anomalochromis thomasi
- Anoplocapros inermis
- Anoplocapros lenticularis
- Anostomidae
- Anostomus anostomus
- Anostomus ternetzi
- Anoxic
- Ansorge's Neolebias
- Ant eggs
- Antennariidae
- Antennarius maculatus
- Antennata Lionfish
- Anterior
- Anthia
- Anthias
- Antibacterial
- Anubias
- Anubias affinis
- Anubias barteri
- Anubias barteri "coffeefolia''
- Anubias barteri var. angustifolia
- Anubias barteri var. barteri
- Anubias barteri var. caladiifolia
- Anubias barteri var. nana
- Anubias bequaertii
- Anubias congensis
- Anubias gracilis
- Anubias heterophylla
- Apalachee Shiner
- Aphanius anatoliae
- Aphanius danfordii
- Aphanius mento
- Aphanotorulus ammophilus
- Aphanotorulus emarginatus
- Aphanotorulus unicolor
- Aphyocharax alburnus
- Aphyocharax anisitsi
- Aphyocharax paraguayensis
- Aphyocharax rathbuni
- Aphyolebias peruensis
- Aphyoplatys duboisi
- Aphyosemion abacinum
- Aphyosemion australe
- Aphyosemion cinnamomeum
- Aphyosemion gabunense gabunense
- Aphyosemion gardneri
- Aphyosemion georgiae
- Aphyosemion hera
- Aphyosemion loennbergii
- Aphyosemion ogoense
- Aphyosemion ogoense ogoense
- Aphyosemion sjoestedti
- Aphyosemion splendopleure
- Aphyosemion striatum
- Aphyosemion volcanum
- Apisto Blue Head
- Apistogramma
- Apistogramma agassizii
- Apistogramma atahualpa
- Apistogramma baenschi
- Apistogramma bitaeniata
- Apistogramma borellii
- Apistogramma brevis
- Apistogramma cacatuoides
- Apistogramma commbrae
- Apistogramma eunotus
- Apistogramma gibbiceps
- Apistogramma hoignei
- Apistogramma hongsloi
- Apistogramma linkei
- Apistogramma macmasteri
- Apistogramma nijsseni
- Apistogramma norberti
- Apistogramma panduro
- Apistogramma ramirezi
- Apistogramma resticulosa
- Apistogramma sp.
- Apistogramma sp. "Rio Madeira"
- Apistogramma steindachneri
- Apistogramma trifasciata
- Apistogramma viejita
- Apistogrammas
- Aplites salmoides
- Aplocheilichthys antinorii
- Aplocheilichthys brichardi
- Aplocheilichthys normani
- Aplocheilidae
- Aplocheilus dayi werneri
- Aplocheilus lineatus
- Aplocheilus werneri
- Apogon atricaudus
- Apogon aureus
- Apogon cyanosoma
- Apogon kallopterus
- Apogon luteus
- Apogon nigrofasciatus
- Apogonidae
- Apolemichthys arcuatus
- Apolemichthys griffisi
- Apolemichthys guezei
- Apolemichthys kingi
- Apollo Betta
- Apollo Shark
- Apollo Sharkminnow
- Aponogeton boivinianus
- Aponogeton crispus
- Aponogeton longiplumulosus
- Aponogeton madagascariensis
- Aponogeton ulvaceus
- Apple Snail
- Apple snail
- Apple snails
- Apricot Tetra
- Apteronotidae
- Apteronotus albifrons
- Apure Jelly Catfish