An Evaluation of Concrete Block Structures as Shelter for Juvenile Caribbean Spiny Lobsters, Panulirus Argus
Abstract:Structures constructed with commercial concrete blocks were tested to evaluate their use as shelters for juvenile spiny lobsters (Panulirus argus): uncovered structures with either two layers of large blocks (type 1), or three layers of small blocks (type 3), and covered versions of each type of shelter (types 2 and 4, respectively). Three shelters of each type were deployed in eight sites in Bahía de la Ascensión, México, and were censused on 10 different occasions, for large (>50 mm CL) and small (≤50 mm CL) juveniles. Only shelters in site 8 were found to attract significant numbers of juveniles, most of them small. Juveniles were known to abound naturally in this site, although its consistently high turbidity is counter to assumed habitat requirements for juvenile P. argus. Abundance of juveniles in this site varied over time, but not with shelter type. A few large juveniles were recorded in sites close to the coral reef, mostly in type-2 shelters. Juveniles showed no preference for layer of occupancy in three-layered shelters, but preferred the top layer in two-layered structures. These results suggest that in addition to certain physical characteristics of the shelter, local habitat features are also important in determining the success of artificial shelters in attracting and concentrating lobsters.
Document Type: Research Article
Publication date: 1994-09-01
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