Browsing by Subject "Cyanophyta"
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Oral presentation- In Y Taki, JH Primavera & JA Llobrera (Eds.), Proceedings of the First International Conference on the Culture of Penaeid Prawns/Shrimps, 4-7 December 1984, Iloilo City, Philippines, 1985 - Aquaculture Department, Southeast Asian Fisheries Development CenterIn 1983, penaeid shrimp shipped into the United States from culture ponds in Ecuador were found to have an intense earthy-musty flavor which made them unmarketable. High concentrations of geosmin (trans, 1-10-dimethyl-1-9 decalol), a musty odorous compound, were found in the tail muscle of the shrimp. The level of geosmin, 78 mg/kg muscle, was much higher than levels usually found in pond-cultured freshwater catfish of 13±3 mg/kg muscle. Cause of the rare occurrence of off-flavor in the shrimp is hypothesized to be severe reduction in salinity in the coastal culture ponds which allowed growth of odor-producing blue-green algae.
Aquaculture, 1993 - ElsevierGrowth, survival, and production of P. monodon feeding on four types of natural food, i.e., lablab (benthic mat of cyanobacteria, diatoms, and associated fauna), Ruppia maritima, lumut (filamentous green algae and attached organisms entangled in the water column and on the bottom), and plankton, were evaluated in ponds in Iloilo, Philippines. The gut content of shrimp was analyzed and the flow of the food web was traced using stable carbon isotope (δC) analysis. Twelve 500-m2 ponds were stocked with juvenile shrimp (average weight 0.8 g) and grown for 3 months at the rate of 4000 ha−1. In Ruppia and plankton ponds, the shrimp attained 91–92% survival, and in lumut and lablab ponds, 76–80%. Total shrimp production in Ruppia and plankton ponds was 114 and 129 kg ha−1 crop−1, while lumut and lablab ponds yielded only 59 and 85 kg ha−1 crop−1, respectively. The δC analysis of all treatments was not significantly different, indicating that a common food (detritus), as shown by the gut content analysis, appears to be the most significant food resource of shrimp in this study. Shrimp foreguts from all the treatments consisted of detritus (non-living particulate matter), copepod/animal remains, diatoms, cyanobacteria, and green algae. Detritus ranked highest in frequency of occurrence, followed by copepod/animal remains.