The number of nesting little tern pairs along the south coast in the 1980s was 350.
The Dunlin, Thistle, Northern Producer, Murchison, North Alwyn, Tern, Eider and North Cormorant platforms are also affected.
The only Little Tern colony in Wales, the birds breed on the shore before migrating south in September.
About 350 little tern pairs nested along the south coast in the 1980s.
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Nobody knows whether the birds on nearby Coquet Island, which include the roseate tern, an endangered species in Europe, will survive.
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The fish are also known to be food to seabirds, including common tern and gannet which have been seen from the bridge.
The loud squabbles and squawks of the punky-haired great crested tern, the black-naped tern, the bridled tern and the red foot-and-beaked roseate tern, fill the air during high summer.
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Such flow levels were a reproductive cue for spawning fish and produced sandbars that served as vital nesting grounds for shorebirds, particularly the least tern and piping plover.
Wez Smith, RSPB Langstone Harbour site manager, said the beach would now offer an "attractive and safe" nesting area for the area's little tern population during the breeding season.
During Springwatch's visit to Blakeney Point they also spotted the sandwich tern - a migrant that nests on the spit during the summer before heading to Africa in the winter.
When the Home Service was disbanded he decided to transfer to 1st Battalion, The Royal Irish Regiment and he joined them at Tern Hill, near Market Drayton in Shropshire, in April 2007.
Environmentalists treasure Plum Island as a home to rare plants, a site where seals rest on rocks in large numbers, a stopover point for migratory birds and a habitat for endangered species like the roseate tern.
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