Arthur. — On the Brown Trout introduced into Otago. 



511 



8. Neither is there any real variation in the pyloric casca, excepting in 

 the range of numbers ; if my explanations given above are borne out by 

 future research. 



The numbers of our trout are increasing in such good breeding waters 

 as the Shag, Kaihiku, and Waiwera Rivers, but they are not so heavy by 

 a great deal as in former years. Poaching and fishing are no doubt largely 

 the cause of this ; but some other rivers show a diminution in the numbers, 

 with a rise in the average weight of the trout caught. Bad spawning and 

 plundering of shags are no doubt the prime causes. 



Appendix. 

 Table of numbers of Scales, Pyloric Cceca, and Vertebra of Otago Trout, 1883. 









SCALES. 













Wght. 





Py- 



Ver- 





Locality. 



SEX. 









loric 



te- 



Remarks. 







lb. oz. 



Idipose 

 jO late- 



Lat 1. Tr. 1. 



C'ca. 



brae. 











ral line. 



1 







Kakanui Eiver 



F 



8 



1 



124 



65 



49 



58 



Caught by Mr. S. Lowe. 



Shag Eiver 



F 



3 



17 





. , 



54 







,, 



M 



4-8 



15 



124 









Sent by Mr. J. Muir. 



• • 



F 



2-4 





117 



48 



36 



54 





• • 



F 



1-144 



17 



120 



60 



45 



57 





• • 



F 



2-8 









40 



53? 



Large cseca. 



Waikouaiti Kiver . . 



F 



14 



17 













Water of Leith . . 



F 



6 



15 



. . 



. , 



50 



54 





Lee Stream 



F 

 F 



2 

 1-1* 



15 







33 



59 





• • 



F 



1-4 



16 













)> 



F 



1-1 









46 



60 







F 



4-8 



14 



. , 



. . 



46 







• • 



F 



3-10 



17 



. . 



, , 



44 



56 







F 



4-8 



17 





. . 



50 







* * 



F 



1-9 



17 



. . 



. . 



55 







>> • ■ 



M 



l-H 









54 



59 





j> • • 



M 



2-12 



. . 



119 



55 



44 



59 





Deep Stream 



M 

 M 



3 

 3-4 



14 



•• 



■• 



53 



59 





Tokomairiro Kiver 



F 



7-4 



. . 



121 



53 



61 



59 



Very short and thin CEeca. 



Waiwera Biver 



F 



F 



2-13 

 5 



16 

 17 



128 



66 



50 







Waipahi Eiver . . 



M 



4-2 



17 











Sent by Captain Fullarton. 



» • • 



M 



4-8 









37 



57 



»> i) 





• • 



M 



5-8 



14 











ii )i 





• • 



M 



8-10 



16 











Caught by Mr. Bull. 





• • 



F 



1-8 









39 









» • • 



F 



6-14 



18 



120 



55 



50 









» • • 



F 



3-24 









54 









i ••• 



M 



4-8 



16 



120 



60 



55 



58 









M 



1-7 









49 







Kuriwao Eiver 



F 



112 



14 



m . 



. , 



46 







Kaihiku Eiver 



F 



5-5 



. . 





. . 



46 





Large caaca, £ to 2£ inches. 



Otago Harbour . . 



F 



5 



16 



124 



55 



52 



57 





Wakatipu Lake . . 



M 



11 



, , 



117 



53 



47 





/Sent by Mr. Dalgleish. — 



i) • • 



M 



10 









49 





J Large caaca § to 2^ in. 



si • ■ 



M 



12 



15 



. . 



. , 



36 





1 long, and 1*10 to | in. 





>» • • 



M 



9-4 











59 



( thick. 



