The assessment of the activity of digestive enzymes showed that at the onset of exogenous feeding, gastric glands were already functional as indicated by the increase in pepsin specific activity. Many of the problems for the sturgeon are inflicted by human activity, especially fishing. The highest negative effects were evoked by glutamic acid. Other than at times of spawning the sturgeon is a bottom dweller in the mud or sand. The Beluga sturgeon is recognised as a unique phylogenetic entity. This study analysed the attraction/avoidance responses of the Persian sturgeon (Acipenser persicus) juveniles to 20 free L-amino acid solutions, 0.001 M.We used aquaria with two parallel compartments with a water flow of ≈ 300 mL min −1 in each compartment.

The Russian sturgeon (Acipenser gueldenstaedtii) is one of the most commercially valuable fish species in the Caspian, Azov, and Black Seas due to its role as a major caviar producer (Vlasenko et al. It is the most widely known breed of sturgeon in the world. Introduction.

Distribution in the Caspian Sea Spawning occurs at different times for the different rivers. This was confirmed by comparing the numbers of fish in test and control compartments.
Considering these data on the digestive enzymes from the pancreas, stomach and intestine, Persian sturgeon larvae might be weaned around 19–24 dph, as larvae have achieved the complete maturation of their digestive functions by this date.

646 pp. Register to receive personalised research and resources by email, Behavioural responses of the Persian sturgeon (Acipenser persicus) juveniles to free amino acid solutions, Faculty of Natural Resources, Fisheries Department , Tarbiat Modares University , Al Ahmad St., Tehran, Iran, Faculty of Biology, Department of Ichthyology , Moscow State University , 119992 Moscow, Russia, Faculty of Natural Resources, Fisheries Department , Tarbiat Modares University , Al Ahmad St., Tehran, Iran ; Faculty of Sciences, Department of Biology , Shahid Beheshti University , Iran, /doi/full/10.1080/10236240701602184?needAccess=true, Marine and Freshwater Behaviour and Physiology, : Chemical ecology in aquatic systems, Guest Editors: Francesca Gherardi & Roberto Berti, Medicine, Dentistry, Nursing & Allied Health. The Gulf sturgeon is a sub-species of the Atlantic sturgeon that can be found from Lake Pontchartrain and the Pearl River system in Louisiana and Mississippi to the Suwannee River in Florida. We use cookies to improve your website experience. 5 Howick Place | London | SW1P 1WG. When fishermen take the Sturgeon out of the sea prematurely they disrupt the ecological cycle by taking out pre-mature fish and decreasing the spawning population. Registered in England & Wales No. At approximately age 2-3 years many feed on crabs or fish, and finally in adulthood the Persian sturgeon consumption is primarily fish. The Persian sturgeon is heterotroph equipped with tactile and gustatory receptors, when feeding it simply sucks in its food. The Persian sturgeon feeds at the shelf zone of the sea, primarily in the eastern part of the South Caspian. https://doi.org/10.1016/j.aquaculture.2011.04.032. Aspartic acid, tyrosine and glutamic acid evoked negative responses. Hatched in the freshwater of rivers, Gulf sturgeon head out to In this study, deleterious effects of the traditional cryopreservation technique and the effect of different d … There are four considerations one must account for when discussing the conservation of the Persian Sturgeon. Therefore, alanine and glycine can be considered as attractants and glutamic acid as a repellent for Persian sturgeon juveniles. It is one of the largest freshwater fish on earth. During each trial, the flow of clean water in one compartment was replaced for 3 min by a test solution of free amino acids. This sexual reproduction occurs in waters that are 20-25°C. Algal seaweeds have abundant amounts of active substances and can be used as pharmaceuticals and biomedicals in aquafeeds. This study analysed the attraction/avoidance responses of the Persian sturgeon (Acipenser persicus) juveniles to 20 free L-amino acid solutions, 0.001 M. We used aquaria with two parallel compartments with a water flow of ≈ 300 mL min−1 in each compartment. Publications Kottelat, Cornol and Freyhof, Berlin. The sturgeon mainly reproduces in the Volga, Kura, Araks, and Ural rivers. Daphnia water extracts were used as a positive control. Larvae were obtained from artificial propagation of one male and one female and transferred to larval culture tanks where, after yolk sac absorption (9 dph at 17–18 °C), they were fed with Artemia urmiana and Daphnia sp. Individual species are found in the North Caspian, western part of the Middle and South Caspian.

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To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. During each trial, the flow of clean water in one compartment was replaced for 3 min by a test solution of free amino acids. Formerly omnipresent in the region, heavy fishing of the sturgeon for caviar has forced it to Endangered Species status. The Persian sturgeon (Acipenser persicus) is an endangered species of sturgeon. Populations may also occur in tributaries and rivers inbound to the Caspian Sea. Copyright © 2011 Elsevier B.V. All rights reserved. By closing this message, you are consenting to our use of cookies. After the first feeding, amylase and lipase specific activities increased. Such increments in the activity of amylase might be genetically programmed to better digest carbohydrates in diets with the goal of sparing proteins during the larval stage, whereas the increase in lipase was related to changes in the lipid content of live prey and the progressive maturation of the pancreatic function during larval development. In this context, the powder of red macroalgae Gracilaria persica was included in the diets of Persian sturgeon at the rate of 0, 2.5, 5, and 10 g/kg to investigate its role on the growth rate, fillet colouration, haemato-biochemical indices, serum, and skin mucus immunity. 59043) Description It is found in the Caspian Sea and to a lesser extent the Black Sea and ascends certain rivers to spawn, mainly the Volga, Kura, Araks and Ural Rivers. 35,b; Birstein and Bemis 5) and important aquaculture species (Fig. One such solution to this problem would be governmental or non-governmental subsidies to aid hatcheries in the artificial reproduction of the Persian Sturgeon. Changes in enzyme activities from the stomach and pancreas were coupled with that in the intestine (brush border membrane), where the specific activity of alkaline phosphatase progressively increased until 19–24 dph and remained constant thereafter, indicated the maturation of the intestine and the achievement of a juvenile-like mode of digestion.