ECOLOGICAL SUCCESSION. 31 



<>\ the fish environments has received little or no attention. 

 La\\- have been enacted to prevent the pollution of waters, but 

 the-e have been enforced but rarely. 



In practice the importance of the breeding season ha- been 



iv<ogni/ed by the culture worker- but appear- to have ivcehcd 



little attention from the point of view of the pre-ervaiion or 



culti\ation .! fish breeding places in the natural waters. Chirk 



i<> i- one of the few who have empha-i/ed breeding Around-. 



1 he main emphasis has been laid on nutrition Knauthe. '07. 

 Chap. 1\ 



( >ur data indicate that the breeding intere-t- and the feeding 

 interests of ,ij|| water food and gam.- ti-he- are ilistini'tly an- 

 onistic. I'.irge Clo) pointed out that \\here the quantity of 

 pl.inkion t and the fish food acconlingU great, the o\\geii 



conteni i- |o\\ .it the bottom and the water accordingly un-uited 

 i" the production of certain of the be-t food ti-he- Knauthe 



p. -,7' states that a large fish producm it\ in a pond i- com- 

 nioiiK indicated by large amount of gn-- \egetation, but says 

 also that thf general statement that Mich pond- are al\\a\- good 

 lroducer- ot ti-h cannot be made. Thi- indicate- that there 

 are Othei factors. lie makes no mention of breeding and d 

 not state the practice of pond owners as relating to the breeding. 

 In -landing and sluggish water, the problem of the balance I.e- 

 t \\eeii the lood supply and the fish prc-ent -eeiu- ivlathelv un- 

 important. Cilice feeding conditions of de-irable \,><\ li-lic- gn>\\ 

 better \\ith time at the expense of the breeding condition-, the 

 major problem is that of the halam :/;/^ and lirccdin^ 



< <ni(liti(i.\. It appear* that such balance might be maintained 



ea-il\ it u i had an adequate knoulrdge ot the environmental 



lelatii'ii- ol the lish. Definite knowledge as to -pacing of nests 

 in natiin- -hould gi\'e data as to bn-eding area re|iiired per 

 ca|>ita b\ li-h. \\'ith such knowledge at hand, together \\ith the 

 e\i-ting knowledge of food habit-, it -hould not be difficult to 

 maintain adequate breeding area- a<ljai ent to good feeding areas 

 within our \\aters both public and prhate. 



; v (/'c;/cn;/. \\'e have noted the aspects of the (|uantitali\ e 

 and eci.noiiiic problem- \\hich our data I'nable u- to disCUSS. 

 The remaining indication- of the reconnai ance are tho-e related 

 ictors governing distribution and metho<l- of -tnd\ . 



