Is this true? - if the cows are lying down, the fish are not biting

Yesterday I was educated that when the cows are lying down, the fish are not biting.  Well even the horses were laying down yesterday.  Did that mean that the whales were also not out? Mutton Bird Island is a favourite fishing spot approx 16km from Albany. Main species that can be caught here are herring, skippy, rock species, whiting, salmon, silverbream, pike, flathead, shark, queen snapper and sampson fish. 
But yesterday the beaches and the rocks were empty and there was not a fisherman in sight.
Mutton Bird Island a favourite fishing spot - no fisherman to be seen
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