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House only one per tank. Rockmover Wrasse should not be placed in a reef aquarium. Your marine aquarium should also have a tight-fitting lid to prevent it from jumping out.

Seahorses are marine fish, and thus need the highest water quality and suitable filtration if kept in captive aquaria - they are not something that can be placed in an existing marine aquarium with other fish.

Blue-ringed octopuses typically have a lifespan of approximately two to three years, although this can vary based on factors such as nutrition, temperature, and light intensity in their environment.

A spotlight has been shining on Scottish Salmon farming recently, moreover the prevalence of sea lice affecting the farmed salmon stock. One method of controlling parasites present in farms relies upon the Wrasse

When keeping Porkfish in a marine tank, it is recommended that the ideal aquarium size is 100-135 gallons, or around 500-600 litres. Porkfish are not really suited for reef aquariums.

The strength of salt in the water averages around 3.5%, being weaker around ice caps and stronger in land-locked areas. The concentration in the Dead Sea and Red Sea areas for example is much higher, around a whopping 40%.

Five "orders" make up 95% of the fishes in the freshwater aquarium hobby. They are the Cypriniformes, the Characiformes, the Siluriformes, the Cyprinodontiformes and the Perciformes.

Sperm whales can live up to 75 years and are currently considered a 'vulnerable' species on conservation lists. There were over 2 million Sperm Whales a century ago, but the population has dwindled to less than 250,000 in modern times.

To browse the full range of OATA care sheets for all species of tropical and coldwater fish, as well as guides for setting up aquariums and garden ponds please click here.