Oranda goldfish with distinctive head growth (wen)

Oranda Goldfish: Care and Maintenance Guide

The oranda goldfish is one of the most striking and attractive representatives of fancy goldfish, originating from China. First mentions date back to the late 16th century, though some sources suggest the fish was known in Japan as early as the 15th century. In China, the oranda is called “water flower” for its grace and beauty.

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Nine-spined stickleback fish in aquarium

Nine-spined Stickleback: Care and Breeding Guide

Nine-spined Stickleback — A Forgotten Gem from Local Waters

The nine-spined stickleback represents one of those remarkable native species that once graced home aquariums far more frequently than today. While tropical fish dominate modern fishkeeping, our local waters harbor species that rival exotic imports in beauty and behavior. In my experience, few demonstrate this better than the nine-spined stickleback, whose breeding rituals offer displays as captivating as any fighting fish.

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Goldfish swimming in an aquarium

Goldfish Care: The Queen of the Aquarium

Goldfish Care: The Queen of the Aquarium

The underwater world captivates with its beauty. While not everyone can explore ocean depths through diving, anyone can bring a piece of that aquatic wonder into their home with an aquarium. Among all available fish species, goldfish remain the most attractive choice for aquarists worldwide.

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Gudgeon fish (Gobio gobio) in aquarium setting

Gudgeon in Aquarium: Care Guide for Coldwater Fish

Why Gudgeon Deserves Aquarists’ Attention

Keeping a gudgeon in aquarium isn’t as unusual as it might seem. This fish was quite popular among hobbyists in the past and can become a fascinating subject for observation. While its coloration doesn’t compete with tropical species, it has its own subtle charm. If you’re interested in learning about the physiology of native freshwater fish, the gudgeon makes an excellent choice.

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Celestial Eye goldfish with yellow-orange coloration

Celestial Eye Goldfish: Care Guide and Requirements

Introduction

The celestial eye goldfish, also known as stargazer or Cho-tengan, is a fancy goldfish variety with a distinctive short body. While Chinese vases depicting these remarkable fish reached Europe centuries ago, the variety itself became known to Europeans only in the early 20th century. This is one of the most unusual and demanding goldfish breeds, requiring special attention. Traditionally, Buddhist monks kept them in shallow temple pools.

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Marimo moss ball (Aegagropila linnaei) in aquarium

Marimo Moss Ball Care Guide (Aegagropila linnaei)

Introduction

The marimo moss ball, scientifically known as Aegagropila linnaei, was first described by Carl Linnaeus in 1753. Often found in literature under the outdated name Cladophora aegagropila, this unusual colony of green algae has been a beloved aquarium inhabitant for generations thanks to its undemanding nature and distinctive appearance. When cut open, it can be transformed into a living green carpet for creating picturesque underwater lawns.

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