FISHERY BULLETIN: VOL. 84, NO. 1 



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Coryphaenoides armatus 



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Figure 20— The distribution of log transformed (log (x+1)) abundance and weight of Coryphaenoides armatus at each station plotted 



against depth. 



the present study showed some overlap, but the 

 temperatures at which the population modes were 

 found were fairly discrete except for Nezumia ae- 

 qualis, Nezumia bairdii, and Coryphaenoides 

 rupestris. 



In Figure 6 the relationship of species with 

 temperature is more clearly defined. The minimum 

 temperature of each species remained fairly constant 

 as did the maximum and modal temperature for 

 those species in which there was no indication of 

 seasonal migratory patterns (Coelorinchus car- 

 minatus, Coryphaenoides carapinus, C. armatus). 

 The 3.5°C minimum temperature found for C. 

 carapinus in June was probably not accurate since 



the deepest trawl of that cruise did not encompass 

 the entire range of C. carapinus. Similarly, the 

 minimal temperatures for C. armatus may not be 

 representative 



Competition Among Macrourids 



Competition among macrourids in the Norfolk 

 Canyon region is probably minimal because the 

 species differ in body size and feeding strategies or, 

 if feeding strategies are similar, the species have dif- 

 ferent distributions with temperature and depth. 

 Close congeners such as Nezumia bairdii and N. 

 aequalis might be expected to occupy similar depth 



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