to the high incidence of empty guts (67%) among 

 specimens collected during the afternoon. More 

 significant, the gut of all 70 other specimens 

 contained many fresh items, all organisms present 

 in the water column after dark. 



Major categories of prey with included species 

 and species groups, are listed below in order of 

 their rank as prey. 



I. GAMMARIDEAN AMPHIPODS (90: 16.9: 43.9) 



Batia transversa 76: 8.5: 21.9); Ericthonias braziliensis (19: 

 1.1: 2.6); Ampithoe spp. (20: 1.3: 2.4); Photis hrevipe^ (14: 1.2: 

 O.S); Ampelisca sp. (3:<0.1: 1.6); Synchelidium sp. (9: 0.1: 0.6); 

 Aoroides columbiae (9: 0.1: 0.4); Hi/ale nigra (3: 0.1: 0.3); 

 Monoculoides sp. (3: 0.3: 0.2); Podocerus cristatus (4: <0.1: 

 0.1); phoxocephalid sp. (3: <0.1: 0.1); lysianassid spp. (1: <0.1: 

 0.1);Pa/-n/)/io.r((.ssp. (1:<0.1: 0.1); Pleiistes phti/pa (1: <0.1: 

 0.1); unidentified gammarideans, including unknown forms 

 and those unrecognized due to damage (73: 3.9: 12.6). 



2. MYSIDS (69: 2.7: 12.5) 



Siriella pacijica (47: 1.7: 9.2); erythropinid sp. (40: 0.9: 3.1); 

 Acanthomysis sculpta (3: <0.1: 0.2). 



3. CUMACEANS (57: 4.9: 8.4) 



Cyclaspis nubila (37: 4.1: 7.2); Cnmella sp. (40: 0.8: 1.1); 

 unidentified (3: <0.1: 0.1). 



4. POLYCHAETES. SWIMMING (36: 0.5: 8.6) 



at least most of them nereids. 



5. CAPRELLID AMPHIPODS (36: 1.4: 7.0) 



Caprella pilidigita (24: 0.8: 4.2); C. californicn (19: 0.5: 2.6); 

 C. brerirostis (1: <0.1: 0.1); unidentified species (1: 0.1: 0.1). 



6. OSTRACODS (43: 1.6: 3.8) 



Parasterope sp. A (37: 1.0: 2.9); Vargida amerkana (9: 0.3: 

 0.5); Phihnnedes sp. (4: 0.1: 0.2); Cycloleheris lobiancoi (3: 

 <0.1: 0.1); unidentified (1: <0.1: 0.1). 



7. ISOPODS (39: 1.7: 3.3) 



Paracercies sp. (27: 0.8: 2.1); gnathiid juveniles and females 

 (21: 0.8: 0.8); Idotea spp. (4: 0.1: 0.1); Cirolana diminuta (3: 

 <0.1: <0.1); Limnoria lignorum (1: <0.1: 0.1); Excorallana 

 kathae ( 1: <:0.1: <0.1). 



8. CARIDEAN ADULTS AND JUVENILES (24: 0.4: 4.1) 



Hippolyte clarki (20: 0.2: 2.2); Eualus herdmani (6: 0.2: 1.9). 



9. TANAIDS(26:0.5:1.2) 



Leptochelia diibia (25: 0.4: 1.0); unidentified (4: 0.1: 0.2). 

 10. EUPHAUSID ADULTS AND JUVENILES (7: 0.1: 2.0) 

 Thys:anoessa sp. (1: <0.1: 0.7); unidentified (6: 0.1:1.3). 



II. FISHES (9: <0.1: 1.6) 



unidentified larvae. 



12. BRACHYURAN MEGALOPS (10: 0.2: 0.7) 



unidentified. 



13. CARIDEAN LARVAE (9: 4.0: 0.6) 



unidentified. 



14. HARPACTICOID COPEPODS (13: 0.2: 0.2) 



Porcellidinm sp. A. 



15. REPTANTIAN ZOEA (6: 0.6: 0.4) 



unidentified. 



16. CALANOID AND CYCLOPOID COPEPODS (4: <0.1: 0.2) 



unidentified cyclopoids. 



17. OTHER COPEPODS (1: <0.1: 0.1) 



unidentified caligoids. 



18. NEBALIACEANS(1:<0.1:<0.1) 



Nebalia pugettensis. 



FISHERY BULLETIN: VOL, 74, NO. 3 

 Sebastes atrovirens— kelp rockfish 



The kelp rockfish, which may attain a length of 

 425 mm (Miller and Lea 1972), was the most 

 numerous adult scorpaenid in the study area. 

 During the day, a few individuals hovered above 

 the sea floor in shadow under the kelp canopy, but 

 most spent the daytime seated on rocky substrata 

 within the forest-quiet but alert. At night this 

 fish generally hovered in mid-water close to the 

 rising kelp stipes (Figure 7), and often amid the 

 kelp canopy, near the water's surface. Occasionally 

 at night it hovered in open water close along the 

 seaward margin of the forest. Diff"erences in 

 activities between day and night have gone un- 

 noted in previous reports of this species. Lim- 

 baugh (1955) reported that it lives in the lower 

 levels of the kelp and among the rocks, and feeds 

 on "crustaceans and small fish." Quast (1968), on 

 the other hand, reported that it ranges all the way 

 from the bottom to the kelp canopy and apparently 

 utilizes "all available foods in these regions." 



Of 29 specimens (89-240 mm, x = 175) collected 

 for study of food habits, all 6 (100%) taken during 

 midafternoon were empty, whereas only 3 of 23 

 (13%) taken at night (more than 4 h after sunset) 

 were empty. Clearly, this fish is predominantly a 

 nocturnal feeder. Quast (1968) noted that many of 

 the kelp rockfish he examined had an empty 

 stomach but did not suggest nocturnal feeding. He 

 noted that his specimens "appeared quite thin" 

 and though recognizing this may be a natural 

 condition, thought perhaps "the high frequencies 

 of empty stomachs and the broad variety of food 

 items found may indicate malnutrition." The kelp 

 rockfish of our study area, we have noted, often 

 have deeply concaved bellies during the day, which 

 we assume is due to the emptiness of their guts at 

 this time. 



Almost all food materials taken by this fish were 

 from the water column. The major food categories, 

 which included species and species groups, are 

 listed below in order of their rank as prey. 



1. MYSIDS (90: 22.3: 39.5) 



Acanthomysis sculpta (60: 18.3: 30.1); Siriella pacijica (65: 

 3.6: 9.2); erythropinid sp. (15: 0.4: 0.2). 



2. CARIDEAN ADULTS AND JUVENILES (85: 7.0: 16.2) 



Hippolyte clarki (65: 4.4: 10.0); Eualus herdmani (40: 2.6: 

 6.2). 



3. GAMMARIDEAN AMPHIPODS (95: 13.8: 13.7) 



Batea transversa (95: 9.3: 9.5); lysianassid spp. (50: 1.2: 1.1) 

 Ampelisca sp. (10: 1.4: 1.3); Pleustes platypa (25: 0.3: 0.3) 

 Podocerus cristatus (5: 0.1: 0.2); Ampithoe tea (5: 0.1: 0.2) 



584 



