Influence of white spot disease on muscle lipid content and fatty acid profile of cultured Penaeus monodon.

摘要

Shrimp infected with white spot disease (WSD) are often released on to the Sri Lankan and international markets for human consumption. It would therefore be of interest to the consumer to know if this disease affects the quality of the shrimp flesh. Using GC, lipid levels and fatty acid profiles of muscle tissue were measured in healthy and WSD cultured Penaeus monodon which were randomly collected from shrimp culture facilities along the N.W. coast of Sri Lanka over a period of 7 months (Oct. 1999 to May 2000). The mean percentage dry wt. lipid content of WSD shrimp was significantly higher (4.3 +- 0.1; P < 0.05) than that for healthy shrimp (3.9 +- 0.2). The predominant fatty acids in muscle tissue for both healthy and WSD shrimp were palmitic (16:0), stearic (18:0), oleic (18:1n-9), linoleic (18:2n-6), eicosapentaenoic (20:5n-3) and docosahexaenoic (22:6n-3) acids. WSD shrimp showed significantly lower levels (P < 0.05) of linoleic acid (9.3 +- 2.0) than healthy shrimp (14.3 +- 3.1); however, significantly higher levels of stearic acid (14.1 +- 3.5) and palmitoleic acid (3.1 +- 1.15) were found in WSD shrimp than in healthy shrimp (11.7 +- 0.4 and 1.7 +- 0.2, respectively). Saturated fatty acid content was higher (41.0 +- 1.6) in WSD shrimp and PUFA content was higher in healthy shrimp (44.8 +- 1.4).