96 DEPARTMENT OF THE NATAL SERVICE 



6 GEORGE V, A. 1916 



(6) Numbers 99 to 128— 



Caught — North channel. 



Examined — The Fish Market, St. Andrews. 



Date— June 25, 1914. 

 (Y) Numbers 129 to 131— 



Caught — Mouth of the St. Croix river. 



Examined^Biological Station. 



Date— July 2, 1914. 



(8) Numbers 132 to 138— 

 Caught — North Channel. 



Examined — The Fish Market, St. Andrews. 

 Datf^-July 7, 1914. 



(9) Numbers 139 to 144— 



Caught — Mouth of the St. Croix river. 

 Examined — Biological Station. 

 Date— July 8, 1914. 



(10) Numbers 145 to 166— 

 Caught— Off the Wolves. 



Examined — Wilson's Beach, Campobello island. 

 Date— July 16, 1914. 



(11) Numbers 167 to 174— 



Caught — Mouth of the St. Croix river. 

 Examined — Biological Station. 

 ^ Date— July 30, 1914. 



(12) Numbers 175 to 461 (representing all the fish of one catch) — 

 Caught — North channel. 



Examined — The Fish Market, St. Andrews. 

 Date— August 4, 1914. 



(b) mode of measurement. 



For measuring the length of the specimens of fish studied a " measuring board " 

 was used. This consisted of a board marked with parallel grooves one centimetre 

 apart and having at one end a short upright piece. The fish to be measured were 

 placed with the end of the snout against the upright and the length to the end of the 

 caudal vertebrae (easily ascertained by feeling) measured to a half centimetre. Every 

 length was recorded as the nearest greater centimetre or half centimetre. 



The length-frequency • curves made from these measurements are shown in Fig. 

 1. Curve B represents all the fish of the first eleven catches. This first curve clearly 

 resolves itself into six humps, which probably represent six-year classes of haddock. 

 In the curve A, which represents one catch of three hundred fish (294 to be exact), 

 these classes are somewhat obscured by the abundance of one class between 45 and 50 

 centimetres long. However, at least five distinct prominences can be seen in the 

 curve. A study of these length-frequency curves shows that the lengths may be 

 assigned to the following year-classes : — 



Length in Average length 



, Class. Centimetras. of class. 



1 33-40 36-5 



2 40-45 425 



3 45-50 47-5 



4 50 58 54 



5 58-64 61 



6 64-70 67-5 



Curve C indicates these classes as shown in curve B. 



An insufiicient number of fish have been examined to enable any conclusions to 

 be made with regard to the relative abundance of the different year classes in Passa- 

 maquoddy bay. 



