New Zealand has added two silvers and a bronze to the Paralympic medal tally.

Kiwi swimmer Sophie Pascoe has claimed her second medal of the London Paralympics while Mary Fisher also took silver in the S11 100m freestyle.

Pascoe won silver in the S10 50m freestyle, edged out by 0.14 of a second by Canadian Summer Mortimer who set a new world record.

Earlier, Pascoe, 19, won the S10 200m individual medley, breaking two world records along the way, slicing more than three seconds off the world's best time in her swim in the final.

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Fisher qualified fifth fastest for her final with an Oceania record and bettered that again in the final to finish 2.54 seconds off the winner in a time of 1:09:83.

Meanwhile, cyclists Phillipa Gray and Laura Thompson claimed bronze in the women's B 1km time trial.

New Zealand Paralympic bosses have targeted 18 medals from the Games, which would represent a good return given there are only 24 athletes.

As many as 12 could come in the pool.