Density, distribution of mounds and

Density, distribution of mounds and nest characteristics of mud lobster Thalassina anomala (Herbst 1804)have been investigated in The District of Tanjung Jabung Barat,Jambi. The research areas were located in Regional MarineProtected Area Pangkal Babu (Station 1), the fish port of KualaTungkal (Station 2), and Perum Manunggal community(Station 3). Fifty-six of squares (10 m x10 m) were placed in theresearch area.The nest characteristics were measured such asbase diameter of mound, height of mound, slope of mound, slopeof hole, diameters of outer hole, deepth of burrow, inclination ofburrow, the temperature and humidity of burrow and theanalyses of substrate. Distribution of mound was random, andthe highest density recorded on Station 1 (5.3/100m2). Thehighest average of mound height (31.79 ±14.66 cm) and thelargest diameter of outer hole (6.19 ±1.42 cm) were found onStation 3. The Nest burrow shape resembling the letter "L","Y" and "I". There was significant correlation betweencarapace width and diameter of outer hole (0.480 ; p < 0.05)