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

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92 CALIFORKIA COOPERATIVE OCEANIC FISHERIES INVESTIGATIONS1963 corresponding to that of the effort did not takeplace. The total landings of 1963 was only about 2%over that of 1962.The low fishing results of 1963 are also evidentfrom that data of the mean catch by vessel-lengthgroupsover the whole year (Table 4). The 1963averages are down 30 to 40 percent as compared to1962, and they are the lowest figures since 1959.We may thus conclude that relatively speaking1963 was a poor year for the anchovy fishery. Onlybecause of the great increase of fishing effort did thetotal quantity landed slightly surpass that of theprevious year.ESTIMATES OF THE FLUCTUATIONS IN THEABUNDANCE OF THE ANCHOVY POPULATIONThe Catch Per Unit of E$ortIn our previous report, we showed that a convenienttime-unit of effort is the work of the vessels during 1month and that the standardization of the vesselscan most easily be accomplished by using the grossA.- NOT ADJUSTED B., ADJUSTED FOR SATURATIONregistered ton as a unit of measure. We thus use catchper month per GRT as our basic measure of abundance.Figure 1 demonstrates this uncorrected abundanceindex.The Abundance IndexBecause it is thought that improved equipment,and increases of size of gears has affected the fishingpower of the vessels since 1959, some correctionsneed to be made in this measure of catch per unit ofeffort. The corrections made are described in our previousreport, and for the period July 1963-June1964, the same correction has been applied as for thefirst part of 1963. This corrected index is shown inFigure 2. It is also believed that when the fish is veryabundant saturation of vessels will depress the c.p.u.e.A vessel cannot catch more than its capacity, evenx6050403020JO0by1706050403020ka(3awacnz0cI!aI-w2JO070605040302010080706050903020101 I!0' OY!i J I d d 631961 62J 1 d d 64I I J'FIGURE 3. Summary of abundance by fishing season.FIGURE 4.Percent trips without cotch.
REPORTS VOLUME XI, 1 JULY 1963 TO 30 JUXE 19GG 93if the sea was full of fish. When incorporating anassessment also of this saturation effect, the indexB. Figure 2 is the result. It is seen from these figuresthat the abundance during 1963 was low in all ports.Figure 3 shows summary by fishing seasons fromwhich the decline during 1963 and 1964 is evident.The decline is most drastic in the central ports300Callao, Huacho, Xupe, but it is also clearly presentin the mean value of all ports between Callao andChimbote. The most prominent feature of these curvesis the absence in 1963/64 of the usual peak abundanceof the October to February fishing season. Theabundance indices of the last part of 1963 and thefirst part of 1964 are the lowest on record since1939.Trips Without CatchThe records of poor fishing and the estimates oflow abundance during this time are confirmed bydata collected on number of unsuccessful trips ofvessels. Figure 4 shows how trips without catch haveincreased since June 1963. The ports of Supe, Huachoand Callao show also yery high figures during 1964while Chimbote seems to be back on a normal valuethis year.THE SIZE OF THE ANCHOVYFigure 5 shows the annual size-abundance curvesMarch through February for the three years since1961. The striking feature of these curves is the lowabundance of the big adult fish (14 ern and more)during the last year. The monthly length-curveswhich are available, but not shown in this report,show that this decline of abundance of adult fishstarted already in the last part of 1962. It becameprominent during 1963. Figure 6 shows the estimatedabundance of fish of sizes of 14-35 cni. or more(adult anchovy, consisting of usually several spawninggroups) by month from March 1961 onmards.7ooMAMJJASONDJFMAMJJASONDJFMAMJJ ASONDJFMAMmnzaIn30II-5!(LI-O!WamWII?ILIL0UWmz3zFIGURE 5.U b6 7 12 13 14 15 cms.Annual length-abundance curves. Chimbote, Callao and Ilo.March to February.FIGURE 6.1962 I963 1964Modal abundance of adult group 14-15 cm. from lengthabundancecurves.
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STATE OF CALIFORNIAMARINE RESEARCH
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STATE OF CALIFORNIADEPARTMENT OF FI
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RONALD REAGAXGovcriwr of the Slate
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PART 1REVIEW OF ACTIVITIESJuly 1,19
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REPORTS YOLUAIE SI, 1 JULY 1963 TO
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REPORTS VOLUNE XI, 1 JULY 1963 TO 3
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REPORTS YOLUME SI, 1 JULY 1963 TO 3
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REPORTS VOLUME XI, 1 JULY 1963 TO 3
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REPORTS vor,uiwIi; SI, 1 JULY 1063
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REPORTS TOT2T71\IF: SI, 1 JUJIT 196
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IiEPOHTS TOLUME XI, 1 JULY 1963 TO
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REVIEW OF THE PELAGIC WET FISHERIES
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KEI'OiiTH TOLUJIE SI, 1 JULY 1963 T
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PART IISYMPOSIUM ON ANCHOVIES, GENU
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OCEANIC ENVIRONMENTS OF THE GENUS E
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KEI'OKTS VOLIXI.: SI, 1 JULY 1963 T
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~~~REPORTS VOLUME XI, 1 JULY 1963 T
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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 and 82: 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
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Page 97 and 98: REPORTS VOLURlE SI, 1 JULY 1963 TO
Page 107 and 108: THE PREDATION OF GUANO BIRDS ON THE
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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 138 and 139: THE ACCUMULATION OF FISH DEBRIS IN
Page 143 and 144: PART IllSCIENTIFIC CONTRIBUTIONS
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REPORTS VOLUME SI, 1 JULY 1963 TO 3
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REPORTS VOLU&IE XI, 1 JULY 1963 TO
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SUMMARY OF THERMAL CONDITIONS AND P
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SEASONAL VARIATION OF TEMPERATURE A
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including the semiannual harmonic?
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REPORTS VOiLUME XI, 1 JULY 1983 TO
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170 CALIFORNIA COOPERATIVE OCWIC FI
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172 CALIFORNIA COOPERATIVE OCBANIC
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174 CALIFORNIA COOPERATIVE OCEANIC
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184CALIFORNIA COOPERATIVE OCEANIC F
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CONTENTSI. Review of Activities Pag
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