The Cod Family 



643 



seaweed and their other surronndings. The parent fish, too, vary somewhat in appearance, 

 those round the English coast as a rule having lirown baclvs with irregular spotty markings 

 on the sides, while those fronr more northern waters usually have darker backs and are less 

 often spotted. Cod are most enormous feeders, and in consequence grow very rapidly. At 

 the Southport Aquarium codling of only | lb. increased in weight to G or 7 lbs. in about 

 sixteen months. 



Ho voracious is the cod that it is very ajit to swallow anything it sees moving, without 

 considering whether it is wholesome. In 1879 a black guillemot in perfect condition was 

 removed from the stomach of one of these fish; while among otlier strange finds by cod- 

 fishermen from the same receptacle was a piece of tallow candle 7 inches long, a hare, a 

 partridge, a white turnip, and, going liack to the year 162G, a " work in three treatises," which 

 was found in the stomach of a fish captured in Lynn Deeps on midsummer eve, and brought to 

 the Yice-Chancellor of Cambridge. The usual food of cod is, however, small fish of various kinds — 

 herrings, pilchards, sprats, crabs, and sea-worms; but the species is not particular what it seizes 

 when shoaling before the spawning-season and food is scarce owing to the number of mouths. 



CHAPTER IX. 



CAVE-FISHES, SAXD-EELS AND THEIR ALLIES, AXD FLAT-FISHES. 



BY W. r. PYCKAFT, A.r.S., F.Z.S. 



THE subterranean fresh-water caves of Cuba furnish the most interesting and most remarkable 

 members of the family in certain small fishes known as Cave-fisiies. Living in complete 

 darkness, the eyes have degenerated so as to be no longer useful as organs of sight ; 

 indeed, in many s})ecies they are entirely wanting. By way of compensation delicate organs 

 of touch have been developed, taking the form, in diiferent species, of barbels, hair-like 

 processes, or tubercles. These blind fishes are closely allied to certain marine forms found in 

 the tropical Atlantic and Lidian Oceans, and it is curious to note that amongst these about 

 seven very rare species are found at great depths in the southern oceans, so gi-eat that light 

 fails to reach them, and they too are blind. 



The Sand-eels, or Launces, are extremely common on the sand}' shores of Europe and 

 North America, living in vast shoals, and displaying a wonderful unison in their movements, 

 rising and falling as with one accord. They burrow in the sand with amazing rapidity, forcing 



ritoiu Iji/ \V. tiaviiiii-Kent^ F.Z .b' I 



[J7(7/ort(-o;i-^Va. 



SPOTTED SOLE. 

 A larger and coaiser fish than the common sole. 



