Results of the larviculture of Atlantic sturgeon (Acipenser oxyrinchus) fed different types of diets

Abstract

Abstract. The aim of this experiment was to assess the impact live and formulated diets had on the growth and survival of larval Atlantic sturgeon, Acipenser oxyrinchus Mitchill. In the first experiment, the results of feeding the fish decapsulated (group D) and undecapsulated (group ND) Artemia sp. cysts were compared. Increases in the body weights and lengths of the fish fed decapsulated and undecapsulated Artemia sp. were similar at values that were not statistically significant. Survival in the larval group fed undecapsulated Artemia was higher in comparison to the group fed decapsulated Artemia (95.0 and 82.8%, respectively). In the second experiment, three commercial starter feeds were used: Aller ArtEX (Aller Aqua, Poland; group A), Nutra HP (Skretting, France; group H), and Perla Prolarvae (Spa Hendrix, Italy; group P). Following 35 days of culture, no differences were noted in fish growth with lengths in the different groups ranging from 28 to 30 mm and weights from 119 to 134 mg. Fish survival in group A was 55% and was significantly statistically higher than that in groups H and P at 31.7 and 35.7%, respectively. The results of the experiment suggest that the best feed for the early stages of Atlantic sturgeon culture is undecapsulated Artemia during the beginning of exogenous feeding followed by an Artemia-based feed in the initial period of feeding with formulated diets.

Intracohort cannibalism and methods for its mitigation in cultured freshwater fish

“…The efficacy of refuges in preventing cannibalism depends to a certain extent on lighting conditions. This aspect has been studied in barramundi perch (Qin et al 2004) and African catfish (Hecht and Appelbaum 1988;Pienaar 1990). In these species, a significant reduction in cannibalistic behaviour and territorial aggression has been demonstrated to occur after introduction of refuges (Solomon and Udoji 2011).…”

The remarkable dynamics in the establishment, rearrangement, and loss of dentition during the ontogeny of the sterlet sturgeon

“…Instead, the early presence of oral teeth would be used for predacious seizing and firmly gripping the prey before establishment of the fully functional suction feeding. Moreover, oral teeth could also be used in the observed cannibalistic behavior of these young larvae 42 . At the time of loss of oral teeth (25‐35 mm TL), the fish grows large enough to seize the prey by the obligatory suction feeding with the use of multi‐rowed tooth patches.…”

“…Moreover, oral teeth could also be used in the observed cannibalistic behavior of these young larvae. 42 At the time of loss of oral teeth (25-35 mm TL), the fish grows large enough to seize the prey by the obligatory suction feeding with the use of multi-rowed tooth patches. The sucked prey is gripped with the now welldeveloped palatopterygoid, infrapharyngobranchial and hypobranchial 1 tooth patches and the just forming hypobranchial 2 tooth patch, until finally swallowed.…”

The effect of stocking density on sterlet Acipenser ruthenus (Linnaeus, 1758) larvae in the recirculating aquaculture system

“…Difficulties like high mortality, low growth rate, occasions of cannibalism, overfeeding, bacterial infections, and weaning difficulties are regularly present during the larval period in sturgeons (Gisbert & Williot, 2002; Laczynska et al, 2020; Williot et al, 2018). These obstacles are associated with inadequate nutrition and/or unsuitable technological settings (Agh et al, 2013; Bauman et al, 2016; Piotrowska et al, 2013). Optimization of the production requires extensive evaluation studies.…”