Table of Contents. Corneal injuries in the Atlantic Stingray Dasyatis sabina (Lesueur) / J. A. C. Nicol (p. 1-8) -- Guanine in the tapetum lucidum of the Ladyfish, Elops saurus Linnaeus / S. Ito and J. A. C. Nicol (p. 9-12) -- Biological notes on the sharks of the north central Gulf of Mexico / Steven Branstetter (p. 13-34) -- Substrate preferences of juvenile penaeid shrimps in estuarine habitats / Roger A. Rulifson (p. 35-52) -- The occurrence of hypoxic bottom water off the upper Texas coast and its effects on the benthic biota / Donald E. Harper, Jr., Larry D. McKinney, Robert B. Salzer and Robert J. Case (p. 53-80) -- Variability of zooplankton tows in a shallow estuary / Thomas J. Minello and Geoffrey A. Matthews (p. 81-92) -- Characteristics of phytoplankton production off Barataria Bay in an area influenced by the Mississippi River / Fred H. Sklar and R. Eugene Turner (p. 93-106) -- Oil spill effects on smooth cordgrass in Galveston Bay, Texas / J.W. Webb, G.T. Tanner and B.H. Koerth (p. 107-114) -- Black mangrove, Avicennia germinans, in Texas: past and present distribution / C. Lee Sherrod and Calvin McMillan (p. 115-131)