Fish & Sea Creatures

Rooiels has a rich coastal edge. Freshwater flows into the estuary, tides push saltwater inland, rocky reefs and sandy bays support a mosaic of marine life. 

In the estuary, small schooling fish such as the Estuarine Round-herring and Cape Silverside form dense shoals in shallow water. They flash silver in sunlight and provide a critical link in the food web, feeding larger fish and birds. Their presence signals a functioning estuary.

Along the rocky shoreline and in rockpools, giant chitons cling tightly to wave-washed boulders, their eight overlapping shell plates flexing as they move slowly across rock surfaces at night to graze on algae. Mussels and limpets anchor themselves against pounding surf.

Perhaps the most flamboyant residents are nudibranchs – soft-bodied sea slugs that appear like drifting fragments of colour. Species such as the Inkspot and Orange-eyed Nudibranch make their home here. They are slow, delicate and often brilliantly patterned, feeding on sponges or hydroids and storing chemical compounds that deter predators. Spotting one in a rockpool is like finding a small underwater orchid.

Reef fish such as Red Roman move between rocky outcrops, while flatfish like Cape Sole lie buried in sand within the estuary and nearshore shallows, nearly invisible until they shift.

Pollution, bait collection, trampling of rockpools, overharvesting, and climate-driven changes in ocean temperature all affect marine life here.