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

More documents

Recommendations

Info

80 CALIFORNIA COOPERATIVE OCEA&’IC FISHERIES ISTESTIGATIOKSof the anchovy which live in v-aters which are not deephave some tendency to look for their food near thebottom. These iliof agous tendencies are more markedduring the winter.SELECTION OF FOODIn connection with the problem of the selection offood by the Argentine anchovy, only some generalconsiderations can be made. The lack of exact quantitativedata on the composition of the plankton collectedwith the fishes studied precludes a more detailedanalysis of this subject. Kevertheless, the availabledata allow some general conclusions 0<strong>11</strong> this problem.The species of copepods from the group of the Calanoidaand Euterpinn acu tifrons, which are frequentlyand abundantly found in the diet of the larvae andjuveniles of the anchovy are also the most abuiidaiitspecies in the plankton. The great quantity of Cladocerain the intestinal content, especially during somewinter and summer months, coincides with the abundanceof this microcrustacean in the plankton. Again,the presence of fish eggs in the food supply, especiallyduring the spring and summer, coincides with thcappearance of these eggs in the plankton. In somecases, remains of fish niusclps were found in the food.which in all probability was part of the bait used bythe fishermen to attract the fishes, as was mentionedearlier.All of the information obtained suggests that thelarvae and juveniles of the anchovy do not select muchof their food, and that they feed upon the food whichis present in greater abundance. as a consequence,their diet may be quite dependent upon the patternsof plankton dispersal. Another very important factoris the accessibility of the food as determined by thesize of the prey and the dimensions of the mouth ofthe fish. Only more detailed quantitative data on thecomposition of the plankton and experimental studieson the feeding habits of the larvae of the anchorycan clarify this interesting problem.OTHER CONSIDERATIONSAnother interesting fact in the study of the larvaeand juveniles of the anchovy is that the quantity offood found in their intestinal tracts was generallysmall. In many cases the ingestion coefficient was lowerthan 0.01. It was believed, as a consequence, that anyanalysis based on the calculation of these coefficientsas,for instance, in the case of the juveniles of A.ilzcisa which were studied simultaneously (Ciechomski,in press), could lead to erroneous conclusions.In respect to the problem of feeding competitionbetween the larvae and juveniles of the anchovy withthose of A. incisa, it can be assumed that, in spite ofthe great similitude between their diets, there is noreal chance that these species should compete fortheir food. This is based on the abundance of theplanktonic organisms and on the fact that all of theindividuals studied were apparently in good condition.SUMMARYThe subject of the present paper has been the foodand feeding habits of the larvae and juveniles of3.0-90.0 mm of length of E. anckoita from coastalwaters off Mar del Plata, Argentina. The followingresults hare been obtained.The incidence of feeding found varies with the sizeof the larvae and juveniles. The lowest values arefourid in larvae of 5.0-30 mm in length. The assumptionis made that this plieiiomenon can be likely relatedto the structure of the digestive tract of thelarvae at this stage of deuelopinent.The argentine anchovy is almost exclusively zooplanktofagousfrom its earlier life stages. The maincomponent of the diet of both larrae and juveniles isCopepoda in all of their dewlopmental stages. Amongthem the Calnnoida are the most abundant group.Phytoplanktonic organisms were found in greatestabundance in the diet of juueniles of 38.0 mni oflength and larger. This phenoiiienon is related to thechangcs which take place in the filtering net of thelarvae along with the derelopnieiit of the gill-rakers.The comparisons betn-een larvae and juveniles ofthe Argentine anchovy E. mchoita and those of thePeruvian “anchoveta ” E. rillgens has been made.The juveniles of the ancliorp show some iliofagoustendencies, especially diiring winter.The assumption is made that the larvae and juvenilesof the anchovy do not choose their prey muchand that they ingest the food that they find in greaterabundance.It is assumed that there is no chance of feeding competitionbetmeen the larvae and juveniles of the anchovyand those of A. incisaREFERENCESAndreo, B. 1960. Sobre la aparicion de las branquispinas enlas formas juvrniles de sardina (Sardina pilchai-dus Walb.) .Real SOC. Espaiiola Hist. Nut., Bol., Sec. Biol. 58: 199-216.Angelescu, V., and M. B. Coussean. 1%6. Distribuci6n espacialy cronolngica de la anchofta en el Mar Epicontinental Argentino.Relacioiies con el desarrollo de las pesquerias pelhgicas.C.A.R.P.A.S., 3, Doc. Tec. 1 :1-30.Bayliff, W. H. 1963. The food and feeding habits of the anchovetaCeteitgraulis inusticetus, in the Gulf of Panama.Inter-Anzer. !Prop. Tuiia Comm., Bull., 7 (6): 3W32.Berner, L., .Tr. 1959. The food of the larvae of the northernanchovy, Engraulis niordax.Inter-Anzer. Trop. Tuna Comru., Bull., 4 (1): 1-22.Blaxter. J. H. S., 1965. The feeding of herring larvae and theirecology in relation to feeding. Calif. Coop. Ocean. Fish.Invest., Rept., 10 :79-88.Ciechomski, .J. Dz., de. In press. La alimentacion del cornalito,Ausfroatherina incisa en la zona de Xar del Plata.Dulta, 1,. A. 1961. Food of anchovy larvae in the Black Sea(in Rnssinn). Sevastopol Biol. Sla., Trudy, 14: 244-25s.Ekegovie, A. 1940. The food of sardines (Clupea pilchardusWalb.) in the metamorphosic stage. Transl. from Serbo-Croatian, 1962. Godisn jak Oceanogr. Inst., Ann. 1939-1940,2: 4144.Fuster de Plaza, Ill. L., and E. E. Boschi, 1958. Estudio bio-1Bgico pesquero de la ancholta (Engraulis anchoita) de Mardel Plata. Sew. Agric. Ganad., Dept. Inaest. Pesquer. Puhl.(7): 1-19.
REPORTS VOLUME XI, 1 JULY 1963 TO 30 JUNE 1966SIHagmeier, E. 1961. Planliton-Aquivalente (Auswertung yon Lebour, &I. V. 1920. The food Of Young fish. SO. 3. MU!.. Diol.chemischen und mikroskopischen Analysen) . Univ. Kiel, Inst. Assoc. L’.Ii., J., 12 :261-321.Jleereufors., Kiieler, Meeresfors., 17 (1):3247.-1921. The food of younfi clu1)eicls. Xar. Bioi. Assor.. I-./\..J., 12 : 4*54(iS.‘’ H., and L’ BerneryOf the Pacific Morris, R, W. 1955. Some considerations regarding the nutritionsardine (Sardinops caerulea). U.X. Fish Wild. Xerv., Fish. of niarine fish larvae. (loiis. f’erm. Itzf. &Jzplor. ,llf,r. .J.. 20:Bull., 60(164) : 175-184.255-2(i5.June, P. C. 1957. Biological investigation of Atlantic coast Schumann, G. 0. 1965. Some aspects of behavior in clupeidsm~uhaclen. Gulf C‘ari?. Fish. Irist.. Proc., (9) : 99-106.larvae. Calif. Coop. Ocean. Fish. Invest., Rept. IO: 71-78.
Page 1 and 2:
STATE OF CALIFORNIAMARINE RESEARCH
Page 3 and 4:
STATE OF CALIFORNIADEPARTMENT OF FI
Page 5 and 6:
RONALD REAGAXGovcriwr of the Slate
Page 7 and 8:
PART 1REVIEW OF ACTIVITIESJuly 1,19
Page 9 and 10:
REPORTS YOLUAIE SI, 1 JULY 1963 TO
Page 11 and 12:
REPORTS VOLUNE XI, 1 JULY 1963 TO 3
Page 13 and 14:
REPORTS YOLUME SI, 1 JULY 1963 TO 3
Page 15 and 16:
REPORTS VOLUME XI, 1 JULY 1963 TO 3
Page 17 and 18:
REPORTS vor,uiwIi; SI, 1 JULY 1063
Page 19 and 20:
REPORTS TOT2T71\IF: SI, 1 JUJIT 196
Page 21 and 22:
IiEPOHTS TOLUME XI, 1 JULY 1963 TO
Page 23 and 24:
REVIEW OF THE PELAGIC WET FISHERIES
Page 25 and 26:
KEI'OiiTH TOLUJIE SI, 1 JULY 1963 T
Page 27 and 28:
Page 29 and 30:
PART IISYMPOSIUM ON ANCHOVIES, GENU
Page 31 and 32: OCEANIC ENVIRONMENTS OF THE GENUS E
Page 33 and 34: KEI'OKTS VOLIXI.: SI, 1 JULY 1963 T
Page 35 and 36: REPORTS VOLUME XI, 1 JULY 1963 TO 3
Page 41 and 42: ~~~REPORTS VOLUME XI, 1 JULY 1963 T
Page 45 and 46: REPORTS VOLUME SI, 1 JULY 1963 TO 3
Page 47 and 48: 130'E 132' 134' 136' 138' 140' 142-
Page 49 and 50: REPORTS VOLUSIE SI, 1 JULY 1963 TO
Page 57 and 58: KI3I’ORTH VOLUJIE XI, 1 JULY 1963
Page 61 and 62: REPORTS VOLUME SI, 1 JULY 1963 TO 3
Page 65 and 66: REPORTS VOLUIIE SI. 1 JULY 1963 TO
Page 67 and 68: REPORTS T’OLUME XI, 1 JULY 1963 T
Page 69 and 70: INFLUENCE OF SOME ENVIRONMENTAL FAC
Page 71 and 72: REPORTS Y‘OLUJIE XI, 1 JULY 1963
Page 75 and 76: ~table shows the values calculated
Page 77 and 78: ateREPORTS T-OLTJIT", SI, 1 JULl 19
Page 79 and 80: REPORTS POLGNE SI, 1 JU LY 1963 TO
Page 81: REPORTS VOLUXE XI, 1 JULY 1963 TO 3
Page 85 and 86: _________--_____REPORTS VOLUJIE SI,
Page 87 and 88: REPORTS TOLTIJIE SI, 1 JULY 1963 TO
Page 89 and 90: -20/5-0 10-f 5-w 25-0 20-= 15-: 10-
Page 91 and 92: REPORTS VOLUNE SI. 1 JULY 19G3 TO 3
Page 97 and 98: REPORTS VOLURlE SI, 1 JULY 1963 TO
Page 107 and 108: THE PREDATION OF GUANO BIRDS ON THE
Page 109 and 110: iod and after 8 AM during the rest
Page 115 and 116: FISH E RYThe California anchovy fis
Page 117 and 118: ~~ ::REPORTS VOLUME XI, 1 JULY 1963
Page 119: CO-OCCURRENCES OF SARDINE AND ANCHO
Page 122 and 123: 120 CALIFORNIA COOPERATIVE OCEANIC
Page 124 and 125: CALIFORNIA COOPERATIVE OCEANlC FISH
Page 128 and 129: 126CALIFORNIB COOPERATIVE OCEANIC F
Page 132 and 133:
~~ ~130 CALIFORNIA COOPERATIVE OCEA
Page 134 and 135:
132 CALIF0RhTTIA COOPERATIVE OCEANI
Page 136 and 137:
134 CALIFORNIA COOPERATIVE OCEANIC
Page 138 and 139:
THE ACCUMULATION OF FISH DEBRIS IN
Page 140 and 141:
Page 143 and 144:
PART IllSCIENTIFIC CONTRIBUTIONS
Page 145 and 146:
Page 147 and 148:
REPORTS VOLUME SI, 1 JULY 1963 TO 3
Page 149 and 150:
Page 151 and 152:
REPORTS VOLU&IE XI, 1 JULY 1963 TO
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
SUMMARY OF THERMAL CONDITIONS AND P
Page 159 and 160:
SEASONAL VARIATION OF TEMPERATURE A
Page 161 and 162:
Page 163 and 164:
including the semiannual harmonic?
Page 165 and 166:
Page 167 and 168:
REPORTS VOiLUME XI, 1 JULY 1983 TO
Page 169:
Page 172 and 173:
170 CALIFORNIA COOPERATIVE OCWIC FI
Page 174 and 175:
172 CALIFORNIA COOPERATIVE OCBANIC
Page 176 and 177:
Page 178 and 179:
Page 180 and 181:
Page 182 and 183:
Page 184 and 185:
Page 186 and 187:
184CALIFORNIA COOPERATIVE OCEANIC F
Page 188 and 189:
Page 190:
CONTENTSI. Review of Activities Pag
show all

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

Create successful ePaper yourself

Delete template?

Save as template?