Some Notes upon the Feeding Habits of Mackerel and certain Clupeoids in the English Channel

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Abstract
Several previous authors have shown that the food of the mackerel, when in coastal waters, is of two different kinds, and that the fish adopts two distinct methods of procuring it. In the first place it feeds by a system of filtration upon planktonic organisms, and secondly upon prey of a larger character which is hunted by sight.