MORSE: CATCHABILITY, GROWTH. AND MORTALITY OP' LARVAL FISHES 



mortalities are summer spawners. The relation- 

 ship of spawning time and mortality was investi- 

 gated by calculating the weighted mean surface 

 temperature for each taxa and plotting it against 



mortality (Fig. 5). Two linear regi'ession lines 

 are fitted to the data points: one for all the data 

 {n = 26); and another without haddock, Sebastes 

 spp., offshore hake, and Atlantic mackerel. 



0.8 



0.7 



0.6 



M 0.5 



^ 0.4 



_j 



(E 



I— 



O 0.3 



0.2 

 0.1 

 0.0 



Sebas tes spp . j^. 



Rt I . mackere I 



offshore hake 

 ^. b I ue f i sh 



* * 



II 13 15 17 19 

 SURFACE TEMPERRTURE 



23 25 27 



Figure 5. — Estimated length-dependent mortality versus mean surface water tempera- 

 ture for 26 larval fish ta.xa, 1977-84 (curve A, n = 26). Labeled points, except 

 bluefish, were e.xcluded from curve B, n = 22. 



439 



