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

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38 C,lLIFOIiSId COOPERSTIVE OCEAXIC FISHERIES IXTESTIGATIONSIl!xFIGURE 5.Map showing localities mentioned in the text, with Gippsland lakes and Port Phillip Bay in insets (from Blackburn 1950a).FIGURE 6. Scale from E. australis of stondard length 64 mm taken inMarch, with first zone of crowded striae forming at the anterior edge(from Blackburn 19500).FIGURE 7. Scale from E. austrolis of standard length 64 mm taken inNovember, with first zone of crowded striae completely formed andsucceeded by a zone of more widely spaced striae (from Blackburn19500).
~~~REPORTS VOLUME XI, 1 JULY 1963 TO 30 JUNE 1966 39FIGURE 8. Scale from E. australis of standard length 75 mm taken inJune, with third zone of crowded striae forming at the anterior edge(from Blackburn 19500).1950 a); the embedded anterior portion is shownuppermost. The striae on the anterior portion aresemi-concentric ; they run parallel to the anterioredge of the scale and obliquely towards the lateraledges. In the region where they lie parallel to theedge, bands of widely spaced striae alternate withbands of narrowly spaced striae, in a way reminiscentof a salmonoid scale pattern.It can be shown that this pattern is annud, andthat the period at which the striae become mostcrowded is in winter. For instance, Figure 6 shows aMarch scale on which the striae are becoming crowdedalong the anterior edge, and Figure 7 shows a Novemberscale on which a similar zone of crowdedstriae has been succeeded by one of widely spacedstriae. A similar comparison may be made for theoutermost zone of crowded striae in Figure 8 (June)and Figure 9 (October). Further information wasgiven by Blackburn (1950 a). Each zone of crowdedstriae was therefore considered to represent one winterof life, with very few exceptions. Other apparentlyperiodic features of the scale pattern might havebeen used, but were not, to indicate the age (e.g.,the zones of interrupted, branched, or fragmentedstriae which occur more or less parallel to the scalesides).Table 1, from Blackburn (1950 a), shows the frequencyof occurrence of different numbers of winter“rings” (zones of crowded striae) in successivelength-groups of fish; the lengths are standardlengths, snout tip to end of body excluding caudalfin (this applies to all lengths mentioned in thispaper); 4.5 ern means 45 to 49 mm inclusive, andother length-groups likewise. Table 1 gives a generalidea of the growth-rate of the Victorian E. australis;FIGURE 9. Scale from E. australis of standard length 81 mm token inOctober, with third zone of crowded striae completely formed andsucceeded by a zone of more widely spaced striae (from Blackburn19500).TABLE 1ENGRAULIS AUSlRALE, VICTORIAN SPECIMENS, RECORDED BYNUMBER OF ANNUAL (WINTER) SCALE-RINGS AND STANDARDLENGTH OF FISH; FOR FURTHER EXPLANATION SEE TEXT. (FROMBLACKBURN 1950~1).-~ __ -~~ -4.55.05.56.06.57.07.58.08.59.09.510.010.5<strong>11</strong> .o<strong>11</strong>.50Ring!1Ring2lings_-__42135343710621_____-__3lings4lings_-___-_-___.1618151513515lings’otd-371747484653272726464037224-it is shown below that the fish are hatched in summer,so they are about 0.5 year old at the first ring, 1.5years at the second, etc.More precise information was obtained by calculatingthe successive intermediate lengths of the fish(Ll, La, etc.) at the times when the successive zonesof crowded striae (first, second, etc.) were completed.Such calculations required knowledge of the relationshipbetween the fish-length and the radius of thescale selected for measurement, which was investigatedempirically as shown in Figure 10. Fish-lengthand scale-radius increase in direct proportion onlyabove a fish-length of 60 mm ; at fish-lengths between35 and 60 mm the scales, which may have one or twocomplete winter zones, grow faster than the fish.The calculations of L1, La. etc., were described by4 50
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 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 39: REPORTS VOLUME XI, 1 JULY 1963 TO 3
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Page 47 and 48: 130'E 132' 134' 136' 138' 140' 142-
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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
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Page 79 and 80: REPORTS POLGNE SI, 1 JU LY 1963 TO
Page 81 and 82: REPORTS VOLUXE XI, 1 JULY 1963 TO 3
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Page 89 and 90: -20/5-0 10-f 5-w 25-0 20-= 15-: 10-
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REPORTS VOLUNE SI. 1 JULY 19G3 TO 3
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REPORTS VOLUME XI, 1 JULY 1963 TO 3
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REPORTS VOLURlE SI, 1 JULY 1963 TO
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THE PREDATION OF GUANO BIRDS ON THE
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iod and after 8 AM during the rest
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FISH E RYThe California anchovy fis
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~~ ::REPORTS VOLUME XI, 1 JULY 1963
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CO-OCCURRENCES OF SARDINE AND ANCHO
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120 CALIFORNIA COOPERATIVE OCEANIC
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CALIFORNIA COOPERATIVE OCEANlC FISH
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126CALIFORNIB COOPERATIVE OCEANIC F
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~~ ~130 CALIFORNIA COOPERATIVE OCEA
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132 CALIF0RhTTIA COOPERATIVE OCEANI
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THE ACCUMULATION OF FISH DEBRIS IN
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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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184CALIFORNIA COOPERATIVE OCEANIC F
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CONTENTSI. Review of Activities Pag
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