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- Aphyosemion australe
- Aphyosemion gabunense gabunense
- Aphyosemion georgiae
- Aphyosemion hera
- Aphyosemion loennbergii
- Aphyosemion ogoense
- Aphyosemion splendopleure
- Aphyosemion striatum
- Aphyosemion volcanum
- 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 resticulosa
- Apistogramma sp. "Rio Madeira"
- Apistogramma steindachneri
- Apistogramma trifasciata
- Apistogramma viejita
- Aplocheilichthys antinorii
- Aplocheilichthys brichardi
- Aplocheilidae
- Aplocheilus lineatus
- Aplocheilus werneri
- Apogon atricaudus
- Apogon aureus
- Apogon cyanosoma
- Apogon nigrofasciatus
- Apogonidae
- Apolemichthys arcuatus
- Apolemichthys griffisi
- Apolemichthys guezei
- Apolemichthys kingi
- Apollo Shark
- Aponogeton boivinianus
- Aponogeton crispus
- Aponogeton longiplumulosus
- Aponogeton madagascariensis
- Aponogeton ulvaceus
- Apteronotidae
- Apteronotus albifrons
- AquaBid
- AquaEssentials
- Aqua Core
- Aqua Design Amano
- Aqualog books
- Aquarama
- Aquarian Advisory Service
- Aquarium Club of Lancaster County
- Aquarium Gardens
- Aquarium Hobbyist Magazine
- Aquarium Microbes: Part 1: Nitrification
- Aquascaping
- Aquavitro Alpha
- Aracanidae
- Aragonite
- Arapaima gigas
- Arapaimidae
- Arcadia
- Archaea
- Archaster typicus
- Archocentrus centrarchus
- Archocentrus multispinosus
- Archocentrus myrnae
- Archocentrus nanoluteus
- Archocentrus nigrofasciatus
- Archocentrus septemfasciatus
- Archocentrus sp. "Honduran Red Point"
- Archocentrus spinosissimus
- Arctides regalis
- Ariidae
- Ariopsis seemanni
- Aristochromis christyi
- Arnoldichthys spilopterus
- Arothron caeruleopunctatus
- Arothron diadematus
- Arothron hispidus
- Arothron immaculatus
- Arothron manilensis
- Arothron mappa
- Arothron meleagris
- Arothron nigropunctatus
- Arothron stellatus
- Asolene spixi
- Aspidoras albater
- Aspidoras depinnai
- Aspidoras menezesi
- Aspidoras pauciradiatus
- Aspredinidae
- Assessor flavissimus
- Astatoreochromis alluaudi
- Astatotilapia calliptera
- Astaxanthin
- Asterophysus batrachus
- Astraea phoebia
- Astraea tecta
- Astroblepidae
- Astroblepus ubidiai
- Astrodoras asterifrons
- Astronotus crassipinnis
- Astronotus ocellatus
- Astyanax bimaculatus
- Astyanax fasciatus
- Astyanax kennedyi
- Astyanax leopoldi
- Astyanax mexicanus
- Ateleopodiformes
- Atherinidae
- Atheriniformes
- Atractosteus spatula
- Atractosteus tristoechus
- Atractosteus tropicus
- Atrosalarias fuscus fuscus
- Atya gabonensis
- Atyoida pilipes
- Atyopsis moluccensis
- Auchenipterichthys coracoideus
- Auchenipterichthys longimanus
- Auchenipterichthys thoracatus
- Auchenipteridae
- Auchenipterus nuchalis
- Auchenoglanis biscutatus
- Auchenoglanis occidentalis
- Aulonocara aquilonium
- Aulonocara auditor
- Aulonocara baenschi
- Aulonocara brevindus
- Aulonocara ethelwynnae
- Aulonocara gertrudae
- Aulonocara hueseri
- Aulonocara jacobfreibergi
- Aulonocara korneliae
- Aulonocara nyassae
- Aulonocara stuartgranti
- Aulonocranus dewindti
- Aulopiformes
- Auriglobus modestus
- Auriglobus nefastus
- Auriglobus silus
- Australoheros facetus
- Austroglanididae
- Austroglanis barnardi
- Austroglanis gilli
- Austroglanis sclateri
- Austrolebias adloffi
- Austrolebias nigripinnis
- Autotrophic
- Availability
- Awaous banana
- Awaous flavus
- Axelrodia stigmatias
- Axillary amplexus
- Azolla
- Azolla caroliniana
- Azolla filiculoides
- Azolla pinnata
- BBS
- BCOD
- BF
- BOD
- Baby Whale
- Back pressure
- Bacopa australis
- Bacopa caroliniana
- Bacopa monnieri
- Bacteria
- Bacteria bottles, do they work?
- Badidae
- Badis assamensis
- Badis badis
- Badis blosyrus
- Badis chittagongis
- Badis corycaeus
- Badis dibruensis
- Badis ferrarisi
- Badis juergenschmidti
- Badis kanabos
- Badis khwae
- Badis kyar
- Badis pyema
- Badis ruber
- Badis siamensis
- Bagarius yarrelli
- Bagrichthys hypselopterus
- Bagrichthys macracanthus
- Bagrichthys macropterus
- Bagrichthys majusculus
- Bagridae
- Bagrus meridionalis
- Balantiocheilos melanopterus
- Balistapus undulatus
- Balistes vetula
- Balistidae
- Balistoides conspicillum
- Balistoides viridescens
- Balitora brucei
- Balitoridae
- Ballast
- Balloon
- Banded Barb
- Banded Butterflyfish
- Banded Goby
- Banded Loach
- Bandit Cory
- Barbatula barbatula
- Barbel
- Barbels
- Barbichthys laevis
- Barbodes binotatus
- Barbodes kuchingensis
- Barboides gracilis
- Barbonymus altus
- Barbonymus schwanenfeldii
- Barbus ablabes
- Barbus barbus
- Barbus candens
- Barbus eutaenia
- Barbus fasciolatus
- Barbus guirali
- Barbus holotaenia
- Barbus hulstaerti
- Barbus jae
- Barbus janssensi
- Barbus leonensis
- Barbus lineomaculatus
- Barbus sublineatus
- Barclaya longfoilia
- Barilius barna
- Barilius gatensis
- Barracuda
- Bartholomea annulata
- Baryancistrus chrysolomus
- Baryancistrus demantoides
- Baryancistrus sp "L081"
- Baryancistrus sp "L142"
- Baryancistrus xanthellus
- Basingstoke and District Aquarist Society
- Batasio batasio
- Batasio tigrinus
- Batfish
- Bathyaethiops caudomaculatus
- Batrachoididae
- Batrachoidiformes
- Batrachomoeus trispinosus
- Batrochoglanis raninus
- Beaufortia kweichowensis
- Beaufortia leveretti
- Bedotia geayi
- Bedotiidae
- Beginner FAQ-Equipment
- Beginning Fishkeeping
- Beginning Fishkeeping-Adding Fish
- Beginning Fishkeeping-Choosing your first Fish
- Beginning Fishkeeping-Cycling Your Tank
- Beginning Fishkeeping-Fish Stress
- Beginning Fishkeeping-How to Find a Good Aquarium Store
- Beginning Fishkeeping-Introduction
- Beginning Fishkeeping-Long-term Success
- Beginning Fishkeeping-Monitoring your new pets
- Beginning Fishkeeping-Partial Water Changes
- Beginning Fishkeeping-Practical Freshwater Chemistry
- Beginning Fishkeeping-Preparing Your Water
- Beginning Fishkeeping-The FAQ Team
- Beginning Fishkeeping-Which Test Kits are Important
- Belonesox belizanus
- Belonidae
- Beloniformes
- Belonophago tinanti
- Belontia hasselti
- Belontia signata
- Benthic zone
- Benthochromis tricoti
- Benzalkonium chloride
- Beryciformes
- Betta Club (Singapore)
- Betta akarensis
- Betta albimarginata
- Betta anabatoides
- Betta antoni
- Betta apollon
- Betta aurigans
- Betta balunga
- Betta bellica
- Betta brownorum
- Betta burdigala
- Betta channoides
- Betta coccina
- Betta foerschi
- Betta ibanorum
- Betta imbellis
- Betta macrostoma
- Betta mahachaiensis
- Betta mandor
- Betta miniopinna
- Betta persephone
- Betta pugnax
- Betta smaragdina
- Betta splendens
- Betta splendens - variations
- Betta stiktos
- Betta tussyae
- Betta unimaculata
- Big Al's
- Bio-Balls
- Bio-film
- BioLoad
- BioSpira
- Biotodoma cupido
- Biotodoma wavrini
- Biotope
- Biotope Style
- Biozyme
- Black-Ear Wrasse
- Black Acara
- Black Brush Algae
- Black Catfish
- Black Tetra
- Black ear Wrasse
- Black spot
- Blackear Wrasse
- Blackwater
- Blanketweed
- Blastomussa merletti
- Blenniidae
- Bloat
- Blood Parrot Cichlid
- Bloodworm
- Bloom
- Blue Crayfish
- Blue Green Algae
- Blue Harlequin Shrimp
- Blue Mbuna
- Blue Ram