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65 whale shark banner

The world’s largest living fish

We had an interesting visitor into the Knysna lagoon recently, a whale shark Rhincodon typus. Whale sharks are very large, slow-moving filter-feeders which have a circumpolar distribution through all tropical and warm water, between 30°N and 35°S. The distribution of whale sharks is temperature dependent, and they are rarely sighted in areas with a surface […]

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62 melon (2)

Melon – but not the kind you’re thinking of

Toothed whales (Odontocetes) are unique among mammals – they are able to echolocate underwater. Echolocation is the specialised acoustic adaptation by animals who use sound to forage for prey, navigate, and avoid predators by emitting sounds and listening to echoes as the sound waves reflect off different objects in the environment. This requires morphological and […]

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61 kelp gull

Kelp gull – king of the trash heap?

The human population is increasing rapidly, and demands urban landscape development. Contemporary urbanisation is expanding in such a way that previously natural areas are usurped for expansive growth resulting in protected and natural areas becoming islands embedded in an urban mosaic. This increases the interactions between humans and wildlife in the area. Human refuse, and […]

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60 seismic survey

Seismic surveys – the full story?

Humans have moved into all areas of the world, and even if they are not present, evidence of them is. The marine environment is no different. Marine litter has been of foremost concern but there is growing interest and concern over anthropogenic noise in the marine environment. Seismic surveys, shipping, high power sonar, and echo […]

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59 seismic survey

Seismic survey effects on turtles, fish, and invertebrates

When one thinks about sound in a marine environment, the clicks and squeals of dolphins, and long songs of the whales comes first to mind. So it would seem logical to think that the acoustic signal from a seismic survey array affects primarily dolphins and whales. While much concern has been over the wellbeing of […]

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