The majority of marine animals caught in Australia's largest network of shark nets died, with targeted species only accounting for one in 10 captured.

The NSW government has released its annual report detailing the number of animals and species entangled by its shark nets, days after a surfer was fatally mauled at a beach.

There are 51 nets installed on the state's beaches between Newcastle and Wollongong under the program, each stretching 150 metres and sitting metres below the surface.

The nets are installed at the start of September and remain until after summer.

The government has begun pulling the nets a month earlier, at the end of March, due to increased turtle activity in April.

Of the 13 turtles ensnared in the nets seven died. Green turtles were the main species captured i

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