YOUR EVERYDAY FIELD GUIDE

Fishes.

Discover the world on the other side of the glass.

Fishes / Behaviour

Do Fish Sleep? What Rest Actually Looks Like Underwater

Anyone who has watched their aquarium at night and noticed a fish hovering motionless near the bottom has probably wondered whether it is asleep, sick, or worse. The good news is that yes, fish do res

3 min read

Fishes / Health

Nitrite Poisoning in Marine Aquarium Fish: A Smaller Risk Than You'd Think

Nitrite poisoning is a genuine concern in freshwater fishkeeping, but marine fish have a real, well-documented biological advantage here that's worth understanding rather than testing for out of habit

2 min read

Fishes / Getting Started

Best Live Plants for a Beginner-Friendly Aquarium

Live plants do more for a tank's stability than most beginners expect, absorbing nitrate and other nutrients, producing oxygen, and giving fish natural cover that reduces stress. The species below tol

2 min read

Fishes / Nutrition

Discus: The Amazon Fish That Feeds Its Young With Its Own Skin

The discus is a tall, laterally flattened, almost perfectly round cichlid from slow, sheltered waters of the Amazon basin, prized for the huge range of colours and patterns developed through generatio

2 min read

Fishes / Habitat

Koi Carp: From Rice Paddies to Garden Ponds

Koi, Cyprinus rubrofuscus, are ornamental colour varieties of the common carp, developed in Japan from food fish originally kept in rice paddies. Unlike goldfish, koi are unmistakably large-bodied fis

2 min read

Fishes / Habitat

Giant Danio: The Danio That Outgrew the Name

The giant danio, Devario aequipinnatus, lives up to its name, reaching ten to fifteen centimetres, considerably larger than the zebra or pearl danio and easily the biggest fish in this danio group. It

2 min read