Effect of dietary chitin on digestive enzyme activity, growth and survival of Macrobrachium tenellum juvenile prawns

Abstract

ABSTRACT. Macrobrachium tenellum is a freshwater prawn native from Mexico to Peru, with potential for cultivation. Currently, it is extensively exploited by local fisheries. To understand its chitin requirements, a formulated diet with chitin added (5, 10 15, 20, and 25%) was given to juveniles for 60 days. Growth, survival, and enzyme activity (trypsin, chymotrypsin, lipase, amylase, and chitinase) were measured every 15 days. Highest final weight and specific growth rate resulted from diets with 20% chitin. Poorest performance resulted from diets with 5 and 10% chitin. Chitin in the diet did not have a significant effect on survival. Statistically significant differences in enzyme activity were not found in any treatment.

Effect of stocking density on growth and survival of the prawn Macrobrachium tenellum, cultured in a recirculating aquaculture system

“…More studies would be needed to determine if there is an effect on the growth rate of M. tenellum or not. Despite the lower final AIW, the AIDGR (T1, 0.054 ± 0.021; T2, 0.061 ± 0.018; T3, 0.057 ± 0.009) was inside the range of previous reports for M. tenellum, 0.007-0.135 g for 60 culture days (Vega-Villasante et al, 2011;De los Santos-Romero et al, 2017), thus, it would be necessa- Table 2. Growth performance of Macrobrachium tenellum cultured at different stocking densities in a recirculating aquaculture system.…”

“…The prawns were fed daily with a commercial shrimp diet (40% crude protein, 7% lipid, and 12% moisture; Nutripec Camaronina, Purina, Mexico). The daily feed ratio was determined based on 10% of wet weight and adjusted after each measurement (De los Santos-Romero et al, 2017). Survival was registered daily.…”

“…Average values of each experimental tank were used to determine the following parameters: average individual weight (AIW; g), average individual weight gain (AIWG; g), average individual daily growth rate (AIDGR; g d -1 ), biomass weight per area unit (Wt; g m -2 ), biomass weight gain per area unit (BWG; g m -2 ), specific growth rate (SGR % d -1 ), food conversion ratio (FCR) and survival rate (SR, %) as stated previously Peña-Herrejón et al, 2016;De los Santos-Romero et al, 2017).…”

Effects of dietary supplementation of chitosan on carcass composition and meat quality in growing Huoyan geese

“…Previous findings indicated that dietary CS reduced abdominal fat percentage, saturated fatty acid ( SFA ) concentration, plasma total cholesterol, and high-density lipoprotein cholesterol concentration; increased plasma total monounsaturated fatty acids ( MUFA ); and improved meat quality of broilers ( Razdan and Pettersson, 1994 , Zhou et al., 2009 ). Other studies also observed that feeding CS improved whole-body lipid metabolism in piglets ( Wang et al., 2003 ) and decreased serum cholesterol concentrations in prawns and fish ( Ørjan et al., 2015 , De los Santos Romero et al., 2017 ). Razdan and Pettersson (1994) found that CS decreased plasma lipid concentration in broiler chickens.…”

Development of enzymes during ontogeny of two freshwater Decapoda:Aegla uruguayana(Aeglidae) andMacrobrachium borellii(Palaemonidae)

“…Both enzymes prove to be constantly active in all sizes of organisms, acting on triacylglycerols from the diet and also in those that allow it to obtain energy to be used or transferred as reserve material. Notwithstanding, in juveniles of Macrobrachium tenellum, lower values of lipases were registered (below 50 U/mg protein) (De los Santos‐Romero, García‐Guerrero, Vega‐Villasante, Cortés‐Jacinto, & Nolasco‐Soria, ), but in another experimental study this activity reaches an average of 150 U/mg protein (De los Santos Romero, García‐Guerrero, Vega Villasante, & Nolasco Soria, ). In Litopenaeus vannamei digestive lipases are affected by fasting and increase their activity after 24 hr of treatment, which suggests that lipids are used as energy reserves during fasting (Rivera‐Pérez, Navarrete del Toro, & García‐Carreño, ).…”