CalCOFI Reports, Vol. 11, 1967 - California Cooperative Oceanic ...

78 CALIFORNIA COOPERATIVE OCEANIC FISHERIES ISTESTIGATIOhXFIGURE 5a. Gill-raker of the anchovy Engraulis anchoifa, 50mm long.In order to effect a better interpretation of the relationshipbetween the structure of the filtering apparatusand the diet of the anchovy, it seemed to be ofinterest to compare the structure of the gill-rakersof the Argentine anchovy with those of the Peruvian“anchoveta” Engraulis ringens, whose diet is basedon the phytoplankton. This comparative study wasmade possible through the kind assistance of R.JordBn, of Peru, who sent, at the request of this author,larvae and juveniles of the Peruvian “ancho-FIGURE 5b. Gill-raker of the anchovy Engraulis anchoita, 90mm long.veta”. The results obtained from the examination ofthis material are quite interesting. As can be observedin Figures 5a and 6a the structure of the gill-rakersof the juveniles of 50 mm in length is quite similarin both species. On the gill-rakers of the juvenile ofE. ringens the denticles appear to be just a littlelonger than those of E. anckoita. The study of theintestinal content of 10 juveniles of this length ofE. ringens showed that it is somewhat similar to thatof E. ancltoita at this stage of development, and that