SPINY-RAYED FJSHES. 



67 



The Carangidce (Cases 12, 13), or Horse-Mackerels, are a large [Case 12.] 

 family of carnivorous fishes allied to the true Mackerels, and 

 inhabiting the tropical and temperate seas. One species [Caranx 

 trachurus) is common on our coasts, and almost cosmopolitan 

 within the temperate and tropical zones uf the northern and 

 southern hemispheres. The " Yellow-tails " {Seriola) occur in 



Fio-. ,50. 



Yellow-tail {Seriola lalandii). (From South Australia.) 



all the temperate and tropical seas; the larger grow to a length 

 of from four to five feet, and are esteemed as food. The Pilot- 

 fish [Naucrates ductor) is so named from its habit of keeping 



Fig. 51. 



Pilot-fish {Naucrates ductor). 



company with ships and large fish, especially Sharks. The con- 

 nection between the Shark and the Pilot-fish has received various 

 interpretations; being a small fish, it obtains greater security 

 when in company of a Shark, which would keep at a distance all 



