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Fishery Bulletin 111(2) 
level similar to that of Spotted Seatrout captured at 
inshore sites, may be more prevalent. 
Spatial and temporal differences in SI 
Spatial and temporal patterns in SI composition were 
interrelated and consistent with a seasonal offshore 
movement of individual fish (Hendon et ah, 2002). 
Overall, across all sites, mean 5 13 C for Spotted Seatrout 
in coastal Mississippi suggests a stronger influence of 
pelagic primary production than of terrestrial sources 
on the diet of Spotted Seatrout. Yet, there was a detect- 
able trend: the least-enriched samples were collected in 
nearshore waters in small embayments, and the most- 
enriched samples were collected farther offshore near 
the Barrier Islands. A clear inshore-to-offshore pattern 
of enrichments was also displayed by 5 15 N SI values, 
a finding that is consistent with increases in trophic 
