500 1000 1500 2000 

 FREQUENCY 



2000 4000 

 FREQUENCY 



"RAWLED 



I MP 1 NGED 



F^igure 19. Leiiglh frequency distribution of grubby 



Time-series models described well the temporal abundance of grubby in impingement and larval 

 collections (Appendices XXII and XXIII). All R^ values were over 0.90 in the larval series models. These 

 larval models had annual and 4-mo periodic components as their main deterministic features. Cooling-water 

 flow and an annual cycle accounted for 83% of the variability in the impingement model. All the models 

 have been consistent for the past 3 yr (NUSCo 1984a, 1985, 1986a) suggesting that they included the most 

 relevant variables for describing the natural fluctuations of this species. Summaries of these baseline models 

 are presented in Appendices XXII and XXIII. 



Tautoga onitis, tautog 



The tautog {Tautoga onitis) is found from New Brunswick to South Carolina, but is most conmion 

 from Cape Cod to Delaware Bay (Cooper 1965). Adult and juvenile tautog are found around rocky areas, 

 ledges, mussel beds, breakwaters, an other similar nearshore habitats from eariy May until late October 

 (Bigelow and Schroeder 1953; Cooper 1965). .Juveniles are also found in eelgrass beds and among 

 macroalgae in coves and channels (Tracy 1910; Briggs and O'Conner 1971). Both juveniles and aduhs 

 have a home site where they remain inactive and under cover at night; during the day larger fish move to 

 other locations to feed, but juveniles remain close to their home sites (Olla et al. 1974). During winter, 

 adults move to deeper water and remain inactive while juveniles stay inshore to overwinter in a torpid 

 state (Cooper 1965; Olla et al. 1974). Tautog males become sexually mature at age 3 and females at age 

 4 (Chenoweth 1963). Spawning occurs from mid- May until mid-August in LIS (Wheatland 1956; 



46 



