i 



LAKE HERRING OF GREEN BAY, LAKE MICHIGAN 



Table 41. — Vertical distribution of lake herring taken in oblique sets of gill nets in different periods 



[Mesb slies, extension measure, In Inches] 



129 



Depth Intervals 0-20 and 20-40, one 280-foot net used from surface to bottom. 



i^si^^sgMgg;ss^i:^sg::^^?gj;^^^^t^^i^^^^j^!j^^ 



Figure 14. — Method of setting a gill net in an oblique 

 position. Horizontal scale much reduced. 



It was obviously impossible to avoid some sagging 

 in the gang. The amount of sag was lessened by 

 the action of currents which are almost always 

 fairly strong in Green Bay. 



Oblique sets of gill nets were fished at 12 stations 

 in representative areas throughout Green Bay 

 (fig. 1) from early May to late October 1952. 

 One station (A) was established in 30 feet of water 

 and another (B) in 40 feet in the shallow southern 

 portion of the bay. Six stations (C, E, G, H, K, 



L) were located in 60 feet of water, and 4 stations 

 (D, F, I, J) in 90 feet. 



No lake herring were taken at the shallow- 

 water station A (30 feet) in southern Green Bay 

 and only one was caught at station B (40 feet) 

 in early May (table 41); only a few were taken in 

 late May (A, 13 fish; B, 32 fish) at which time 

 they were found mostly in the upper 15 to 20 

 feet of water. No lake herring were obtained at 

 the 30-foot station in July. A few were again 

 taken at both stations in October (A, 15 fish; B, 

 46 fish) when lake herring were concentrated near 

 the surface. 



Since the distribution of fish varied randomly 

 among individual 60- and 90-foot stations in 

 southern, central, and northern Green Bay during 

 any one season, data for stations of equal depth 

 have been combined to show seasonal differences 

 in distribution. The graphical representations of 

 distribution of lake herring at 60-foot stations 



