depends on the changeable habitats of estuaries and lagoons, even spawning there. Both 
young and adults are tolerant of the normal environmental extremes of estuaries, 
which are too rigorous for most marine fishes. This enables the spotted seatrout to 
reproduce, and grow almost unhindered by predation and competition. Spotted seatrout 
populations of more northern estuaries apparently make seaward movements to escape 
winter cold but southern populations do not exhibit a strong offshore movement. They 
are nearly non migratory in Florida; tagging studies show that they seldom move more 
than 30 mi from the point of tagging. Since most of the favored estuarine areas are 
separated by long stretches of exposed seashore there is little exchange of stocks 
between estuary systems. The non migratory character of the species, when combined 
with differences in habitat, has resulted in spotted seatrout populations having 
different growth rates. Unfavorable conditions for feeding or spawning in any given 
estuary, which cause declines in abundance, are likely to be left for long periods since 
the region will not likely receive large numbers of immigrants from other estuaries. 
1966 - 1967 
Allen, D. M., and J. H. Hudson (1970) A sled-mounted suction sampler for benthic 
organisms. Spec. Sci. Rep., Fish. No. 614. US Fish and Wildlife Service, Washington, DC. 5 
PP- 
The sampler is an underwater vacuum device mounted on a sled; a venturi-type water 
dredge provides suction. This equipment collects quantitative samples of young pink 
shrimp, Penaeus duorarum, and is effective in capturing other small benthic organisms. 
Shrimp catching efficiency was compared with that of a benthic sled net in Florida Bay. 
1966 - 1967 
Idyll, C. P., E. S. Iversen, and B. J. Yokel (1968) Variations in abundance of juvenile pink 
shrimp emigrating from the Everglades National Park, in relation to the commercial catch. 
Circ. No. 295. Bureau of Commercial Fisheries, US Fish and Wildlife Service, Galveston, 
TX. 13-14. 
This citation describes variations in abundance of juvenile pink shrimp emigrating from 
the Everglades National Park, in relation to the commercial catch. 
1966 - 1968 
Allen, D. M., J. H. Hudson, and T. J. Costello (1980) Postlarval shrimp ( Penaeus) in the 
Florida Keys: species, size, and seasonal abundance. Bull. Mar. Sci. . 30:21-33. 
Postlarval shrimp of the genus Penaeus were sampled for 32 months (January 1966 to 
August 1968) at Whale Harbor Channel in the Florida Keys. Most of the postlarvae were 
pink shrimp Penaeus duorarum; the majority had three dorsal rostral spines and were 
approximately 7.5 mm total length. P. duorarum postlarvae occurred year-round but 
were generally most abundant from April to September. The seasonal high in postlarval 
abundance was probably related to the annual increase in water temperature on the 
offshore spawning grounds and to the annual rise in sea level in the Florida Bay area. 
Seasonal abundances of postlarvae at Whale Harbor Channel were closely related to 
abundances of early juvenile P. duorarum on the Florida Bay nursery grounds. The 
juveniles are recruits to the offshore Tortugas shrimp fishery located west of Key 
West, Florida. 
1966 - 1981 
Browder, J. A. (1985) Relationship between pink shrimp production on the Tortugas 
grounds and water flow patterns in the Florida Everglades. Bull. Mar, Sci. . 37(3):839-56. 
Regression analysis indicated a relationship between landings of pink shrimp on the 
Tortugas grounds and freshwater runoff to the estuarine areas of Everglades National 
Park, as indexed by water levels in the Park. Landings, catch per unit effort (pounds 
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