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

REPORTS VOLUME XI, 1 JULY 1963 TO 30 JUNE 1966103mortality during the initial growth phase is notlower than that indicated by direct comparison betweenegg and larval number.Adding up the whole material we find the percentagevalues of larvae versus eggs as shown in.Table 3, the material being divided according toseasons.The higher percentages of larvae per station reflectsthe effect of dispersal. The larval frequencies.are much lower during the spring months. In factthe difference is so great that it must reflect higheregg mortalities during these months.In Figure 8 we have shown graphically the larvalpercentages accordingIIto spawning cycles for theIRECRUITSlodal Abundancel-different areas. It will be seen that areas B and Cfollow the same trend with the lowest values duringthe 1962-63 cycle. It was shown above that a concentratedspawning effort occurred in these areasduring this spawning cycle and it seems that thisresulted in increased egg mortalities. It will be notedthat the recruitment estimates and the percentagefrequencies of larvae in these two areas follow thesame pattern.During the two latter spawning cycles area Eshows a quite different trend with very high larvalpercentages and this is also true for area D duringthe 1962-63 cycle. We ascribe these phenomena toa low spawning intensity within the area, coupledLARVAL PERCENTAGES ACCORDING TO AREAde RECRUITSr( Total Groupe cXIO/O706050 tLIU>iYaA40 LL0Ya3oiuCYwa.20101961M M J S N1962IM M J S N E M M J S N E M M J1963 1964 19650FIGURE 8.