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- W2184595026 abstract "In laboratory feeding trials Pacific mackerel, Scomher japonicus, averaging 147 g in weight did not respond to Artenzia nauplii, but did capture Artemia adults by biting (particulate feeding) when density was 1 or 2/liter and by filtering when density was 22 to 112/liter. Particulate feeding is described by N, = 60.3tD, where N is the number of Artemia ingested in t minutes at D numbers per liter. Filter feeding is described by N, = 23,788 (1 - e-o.ooJWD), where 23,788 is an asymptotic estimate of the number of Artemia in the digestive tract at full capacity. The results suggest that the mackerel utilizes only the larger of the planktonic crustaceans, such as euphausiids, in the sea. For the relatively low average densities of such organisms the derived equations indicate that the mackerel could not obtain its daily nutritional requirement, estimated to be 8% of body weight, in less than 24 hr of feeding. Though the daily requirement could be obtained in much shorter periods, perhaps by filter feeding, if such crustaceans are encountered in aggregations of considerably higher density than reflected by area averages, it is probable that the mackerel must often depend in part on such larger organisms as fish to fulfill its needs. Comparison of the mackerel ingestion rates to those for the smaller northern anchovy indicates that while the individual mackerel may generally capture a greater proportion of the large crustaceans encountered than the anchovy, the proportion captured would have a relatively lower nutritional value for the mackerel." @default.
- W2184595026 created "2016-06-24" @default.
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- W2184595026 date "1972-01-01" @default.
- W2184595026 modified "2023-09-27" @default.
- W2184595026 title "A LABORATORY STUDY OF PARTICULATE AND FILTER FEEDING OF THE PACIFIC MACKEREL, SCOMBER JAPONICUS" @default.
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