Abstract
The productivity of aquatic organisms and higher concentration of suspended solids that occur in areas flooded by Whitewater Rivers and the presence of aquatic macrophytes are conducive to the initial development of matrinxã (Brycon amazonicus). The objective of this study was to evaluate whether turbid waters and refuges with aquatic macrophytes improve the survival and growth of the larvae of Brycon amazonicus, a species of great interest in Amazonian fish farming. For this, two experiments were conducted using a completely randomized design and with four replicas per treatment up to 120 hours after hatching (HAH), In experiment I: Brycon amazonicus larvae at 24 HAH were subjected to three treatments with different types of water: clear water (CW); clayey water (AW) and green water (GW). Experiment II: larvae with 24 HAH were maintained in clear water (CW); clear water with refuge (CWR); green water (GW); green water with refuge (GWR); clayey water (AW) and clayey water with refuge (AWR). Experiment I showed that clayey water, followed by green water, increased the survival of larvae (73.92 and 54.32%). Growth was best in larvae maintained in green water. In experiment II, the use of aquatic macrophytes did not influence the survival and growth of the larvae. Thus, we suggest the use of turbid (clayey and green) waters without refuge to increase the survival and growth of Brycon amazonicus larvae.
Highlights
Brycon amazonicus is noted for being a fish of economic importance and has potential in aquaculture in Brazil and other South American countries (Muller, Villacorta-Correa & Carvalho, 2019) due to it being well accepted in the consumer market, and for having good growth performance (Zaniboni‐Filho, Reynalte‐Tataje & Weingartner, 2006; Gomes & Urbinati, 2010)
There was no significant difference in specific growth rate (SGR) and relative condition factor (Kn) between treatments
The results of experiment I demonstrated that the survival of B. amazonicus larvae was low when they were maintained in clear water and high when raised in turbid waters
Summary
Brycon amazonicus is noted for being a fish of economic importance and has potential in aquaculture in Brazil and other South American countries (Muller, Villacorta-Correa & Carvalho, 2019) due to it being well accepted in the consumer market, and for having good growth performance (Zaniboni‐Filho, Reynalte‐Tataje & Weingartner, 2006; Gomes & Urbinati, 2010). A number of studies have been developed in an attempt to mitigate the effect of cannibalism, increase survival and improve the zootechnical performance of Brycon amazonicus in breeding systems, which included darkening of incubators (Lopes; Senhorini & Soares, 1995); supply of planktonic organisms (Atencio‐García et al, 2003); different levels of luminous intensity (Lopes, Villacorta-Correa & Carvalho, 2018), stocking densities and water temperature (Barros, VillacortaCorrea & Carvalho, 2019), as well as the use of common salt as a modulator of aggressiveness (Oliveira, Duncan & Carvalho, 2020) These studies are mostly based on the manipulation of environmental factors in order to reduce cannibalism and potentiate the production of species of commercial interest, as highlighted by Howell et al (1998) and Franke et al (2013). Improvement in the survival and growth of larvae reared in turbid environments, which can be induced by the addition of microalgae or clay (Shaw, Pankhurst & Battaglene, 2006), have been used as part of the protocols for some species such as Seriola lalandi (Stuart & Drawbridge, 2011), Esox lucius (Salonen & Engstrom-Ost, 2013) and Sander lucioperca (Ljubobratović et al, 2019)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
