Abstract
In this study, we evaluated the utilization of two probiotics incorporated into the water and in the diet in a larval culture system of Amazon River prawn. Autochthonous probiotic bacteria from the gut of wild juveniles of M. amazonicum juveniles and a commercial probiotic were tested and the following parameters were analyzed: survival, productivity, fresh weight, length, larval condition index (LCI) and larval stage index (LSI). The colonization of the larval gastrointestinal tract by probiotics took place when they were incorporated into diet, while probiotics in the water proved to be unsuccessful. The use of lactic acid bacteria had no significant effects (p>0.05) on survival, productivity, length, fresh weight, LSI and LCI, showing similar results in relation to the control group. However, we recommend the inclusion of probiotics into diet in larval culture of Amazon prawn since this method allowed bacterial gut colonization, which is important to evaluate the resistance to disease in further studies.
Highlights
Macrobrachium amazonicum, popularly known as Amazon River prawn (Moraes-Valenti & Valenti, 2010), is widely distributed in South America, ranging from Orinoco and Amazon basins to La Plata, central-western region and northern and northeastern coastal rivers in Brazil (Anger, 2013)
The focus was to verify the influence of probiotics during the cultivation of Amazon shrimp in the larval stage, quantifying the zootechnical indices to determine if there is an advantageous effect of the application of probiotics during the larval stage
3.1 Survival, productivity, larval indexes (LCI and larval stage index (LSI)), weight and length The quality of the water in tanks remained similar among treatments for most of all analyzed parameters, with no significant differences between the daily mean values in each tank (Table 1)
Summary
Macrobrachium amazonicum, popularly known as Amazon River prawn (Moraes-Valenti & Valenti, 2010), is widely distributed in South America, ranging from Orinoco and Amazon basins to La Plata, central-western region and northern and northeastern coastal rivers in Brazil (Anger, 2013) This is a commercially important freshwater species, being exploited by artisanal fisheries in north and northeast Brazil (Maciel & Valenti, 2009; Lima et al, 2014; Marques et al, 2020). The Amazon River prawn is a potential species to intensive culture because it has proved to be suitable for domestication (Maciel & Valenti, 2009) This species has been a target of several studies, representing the third most studied species of Macrobrachium worldwide (Chong-Carrillo et al, 2015). In spite of the development of culture system for this prawn species, there are no reports about the immune response of larvae or the effects of providing immunostimulants in controlled culture conditions
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