Life Sciences Commons^™

Variations In The Ventral Ciliature Of The Crustacean Symbiont Hyalophysa (Ciliophora, Apostomatida) From Mobile Bay And Dauphin Island, Alabama, Stephen C. Landers, Michael A. Zimlich, Tom Coate

Gulf and Caribbean Research

Apostome ciliates are symbiotic organisms whose life cycles are complex and involve specific feeding, divisional, migratory, and phoretic stages. In this study we examined apostome trophonts (the diagnostic stage) from a variety of crustacean hosts in the Mobile Bay and Dauphin Island, Alabama, area. The hosts were grass shrimp (Palaemonetes pugio and P. paludosus), striped hermit crab (Clibanarius vittatus), blue crab (Callinectes sapidus), and pink shrimp (Farfantepenaeus (=Penaeus) duorarum). A number of similar but distinct morphotypes of apostomes were present, those corresponding to descriptions of species of Hyalophysa as well …

The Occurrence Of Lightiella Jones, 1961 (Crustacea: Cephalocarida) In Mobile Bay, Alabama, Richard W. Heard, Gary D. Goeke

Gulf and Caribbean Research

During July 1979, two adult specimens belonging to the cephalocaridan genus Lightiella Jones, 1961 were collected in a box core sample taken at the mouth of Mobile Bay, Alabama. These two specimens were compared to the four described species of Lightiella, and found to be most similar to the northeastern Atlantic species of L. incisa Gooding, 1963 and L. floridana McLaughlin, 1976. Due to a combination of differences in the thoracopodal setation and incisor process of the mandible, the Mobile Bay form cannot at this time be assigned to any of the described species of Lightiella. The two …

Penaeid Shrimp Distributions In Mobile Bay, Alabama, Including Low-Salinity Records, Harold C. Loesch

Gulf and Caribbean Research

Low-salinity records in the Gulf of Mexico area for taking Penaeus duorarum in water of 0.7‰ and 28°C, and Penaeus aztecus in water of 0.2‰ and 29.5°C were established in Mobile Bay, Alabama. Catches in Mobile Bay of approximately 20,000 each of P. aztecus and Penaeus setiferus, distributed over a 30-month period, show that P. aztecus taken in the hotter months had a wider salinity preference (5 to 30‰) than those taken in the cooler months (10 to 15‰). During the warmer months P. setiferus was most common in waters below 5‰ and during the winter months was almost …

Shrimp Population Densities Within Mobile Bay, Harold C. Loesch

Gulf and Caribbean Research

Brown shrimp and white shrimp populations available to the shrimp trawl in Mobile Bay were estimated on a monthly basis by two methods: one using existing commercial statistics and the other using experimental trawling. These methods produced similar estimates for brown shrimp whose peak standing crop in Mobile Bay occurred in June-July and was estimated at 200,000-300,000 pounds. Commercial landings peaked in July at about 342,000 pounds and were higher than the standing crop, indicating an extremely fast growth rate.

White shrimp data were variable, with commercial statistics indicating a crop in Mobile Bay of about 100,000 pounds from September …