ABLE and MUSICK: LIFE HISTORY AND BEHAVIOR OF LIPARIS INQUILINUS 



set respectively. The number offish per scallop was 

 high during the day (Figure 7) and declined sub- 

 stantially in the first sample after sunset. After 

 the initial decrease in the numbers of fish per 

 scallop after sunset, the number increased regu- 

 larly up to daytime levels as sunrise approached. 

 The number offish in scallops was slightly greater 

 than presented in Figure 7. Fish found outside of 

 scallops (122 or 3% of the total) in the collecting 

 buckets or on the deck were not included in the 

 averages. However, these fish were more abun- 

 dant at stations where the number offish per scal- 

 lop was greater so that they did not affect the 

 comparative data. 



73 



7> -^ 



BANK .•• ••" 



•:•>:.•• 



HUDSON 

 CANTON 



• ALBftTROSS n 68-14 

 o ALBATROSS IX 69-8 



Figure 6. — Locations of sampling sites for fish-scallop asso- 

 ciation on 5-17 September 1968, Albatross IV cruise 68-14 

 and on 4-5 August 1969, Albatross IV cruise 69-8. 



The majority of L. inquilinus leave scallops to 

 feed during the night and then return near sun- 

 rise or as they become satiated. Sixty stomachs 

 were examined (five from each sampling period) 

 and were assigned a separate value for relative 

 fullness (0-4) and state of digestion of contents 

 (1-3) with the highest numbers given to stomachs 

 with the most food and the least degree of diges- 

 tion. When added together, these give a relative 

 value referred to as the stomach analysis index. 

 The maximum value possible is 7, the minimum 

 is 1. The higher values should be from fish which 

 had recently fed, and digestion had not begun 

 or had not progressed very far. The stomach 

 analysis index values increased from 2200 h, with 

 highest values occurring just before and after 

 sunrise (Figure 8). The lowest values were found 

 just before and after sunset (Figure 8). Whole un- 

 digested amphipods were found in stomachs of 

 fish taken at night, but after 0800 h stomach con- 

 tents were in increasingly advanced stages of 



Figure 7. — Number ofLiparis inquilinus per scallop from the 

 combined total of two 10-min tows taken every 2 h over a 

 24-h period on 4-5 August 1969 at approximately lat. 39°39'N, 

 long. 73°08'W. For each sample, the range is represented by the 

 vertical line, mean by the horizontal line, one standard devia- 

 tion on each side of the mean by hollow rectangles and two 

 standard errors on each side of the mean by solid rectangles. 

 Numbers above each figure represent the number of scallops 

 sampled. 



Table 2. — Comparison of the number ofLiparis inquilinus in 

 sea scallops during the day and night for a 24-h period. 



0600 0800 tOOO 1200 



I600 1800 2000 22 00 2400 0200 0400 



Figure 8.— Results of stomach analysis of Liparis inquilinus 

 taken from scallops over a 24-h period on 4-5 August 1969. 

 Stomach analysis index value for each stomach was derived 

 from ranking relative fullness (0-4) which is added to the state 

 of digestion of the contents (1-3), with the highest numbers 

 given to stomachs having the most food and the least degree 

 of digestion. 



417 



