Effect of Schizothrix
calcicola on white shrimp Litopenaeus vannamei (Penaeus
Pérez-Linares, M. Cadena, C. Rangel, M.-L. Unzueta-Bustamante, J.-L.
Aquaculture, 218(1-4): 55-65
The noxious effect of Schizothrix calcicola
strain UTEX B-1936 to white shrimp Litopenaeus vannamei (Penaeus
vannamei) postlarvae is reported. The larvae exposed to this
cyanobacterium during a 15-day long experiment grew smaller and weighed less
(R2=0.6704) than unexposed organisms (R2=0.9049).
Histological analysis of exposed shrimps revealed severe damage to the
gastrointestinal linen. We believe that such kind of lesions may interfere
with food absorption, which could explain the slow larvae growth and size
development observed. Hence, S. calcicola blooms in shrimp ponds may
jeopardize the culture by slowing shrimp growth rate and biomass yield.
de Patologia Marina, Centro de Investigaciones Biológicas del Noroeste
(CIBNOR), S.C., Box 128, La Paz, BCS 23000, Mexico,