. Bulletin. Science; Natural history; Natural history. 1976 LIFE HISTORY OF SMALL RATTAIL FISH 209. Table 3. Percentages by numbers of individuals for the dominant taxa in Coiyplmenoides ccirapimis stom- achs in the fauna at the same depths, and an Index of Electivity. 60 80 100 TOTAL WEIGHT, gm 120 KO Figure 4. Gonad weight vs. total weight of fish by season for Coiyphaenoides carapinus. The regression lines were determined separately for each season. DISCUSSION Investigations into the natural history of macro- urid fishes have found them to be rather general- ized in their feeding habits (Pe
. Bulletin. Science; Natural history; Natural history. 1976 LIFE HISTORY OF SMALL RATTAIL FISH 209. Table 3. Percentages by numbers of individuals for the dominant taxa in Coiyplmenoides ccirapimis stom- achs in the fauna at the same depths, and an Index of Electivity. 60 80 100 TOTAL WEIGHT, gm 120 KO Figure 4. Gonad weight vs. total weight of fish by season for Coiyphaenoides carapinus. The regression lines were determined separately for each season. DISCUSSION Investigations into the natural history of macro- urid fishes have found them to be rather general- ized in their feeding habits (Pearcy and Ambler, 1974: Haedrich and Henderson, 1974), a finding in keeping with the notion that large mobile pred- ators in an unproductive environment should tend to be non-selective (Schoener. 1971). As Pearcy and Ambler (1974) observe, however, the dis- tinction between "generalized" and "specialized" is difficult to apply in practice and the argument may be largely semantic. Their data do show that food overlap, using the measure Ca of Horn (1966), is about 50 percent in three species of slope-dwelling macrourids, as compared to 5-24 percent in fishes from shallow-water, north tem- perate assemblages (Tyler, 1972). The deep-water macrourids are the more generalized in a relative sense, but, nonetheless, since they are not con- simiing the full spectrum of probably available prey, they must also be considered at least some- what selective. The data for Coiyphaenoides carapinus illu- strate this quandary. The list of food items (Tabic 2) includes representatives from virtually all im- portant deep ocean ta,\a. Dominance by num- bers, however, indicates that amphipods and ophiiiroids are preferred prey (Table 3). The level of idcntilication possible in the amphipods was usually only to famih or acniis, so the Percentage in: Taxon Stomachs Fauna Electivity Crustacea .81 Amphipoda .85 Polychaeta Ophiuroidea .90 MoUu
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