Comparison of primary productivity with worm fertilizer and commercial fertilizer applications in white shrimp (Litopenaeus vannamei)

Abstract

The phytoplankton is the first link in the food chain of any aquatic organism, it constitutes indispensable fertilization, as a promoter of primary productivity, and the use of fertilizers becomes the second most expensive input in aquaculture production, for this reason the urgency to search for alternate fertilizations that reduce the cost of this input and, therefore, the total production cost, this led to the trial using the worm fertilizer (solid extract of the earthworm Eisenia foetida), as an organic alternative and friendly with the environment. This study was conducted at the Marine and Aquaculture Research Laboratory (LIMA) of UNAN-León, located 22 km from the municipality of León (Las Peñitas Community). The statistical analysis was done through the Kolmogorov Smirnov normality test. The purpose was to evaluate its promoter effect in phytoplankton in contrast to the effects of commercial fertilizer, applying doses of 100lb / Ha. of each fertilizer for each treatment, being T1: commercial Fertilizer and T2: The worm fertilizer, during the period of experimentation, obtaining results of physical-chemical variables (oxygen, pH, temperature, salinity and turbidity) for both treatments without relevant variations, with the presence of the Bacillariophyta and Chlorophyta groups in greater quantity and Cianophyta in smaller quantity, likewise species such as C. meduanae, C. atomus, N. tripunctata, Reverse Nitzschia, Cosmarium Contractum, Volvox aureus, D. tertiolecta.