Acipenser Research Articles

Ontogenetic Behavior and Phototactic Properties of Interspecific Hybrid Prolarvae Produced by Crossing Female Siberian Sturgeon Acipenser baerii and Male Russian Sturgeon Acipenser gueldenstaedtii

Ontogenetic Behavior and Phototactic Properties of Interspecific Hybrid Prolarvae Produced by Crossing Female Siberian Sturgeon Acipenser baerii and Male Russian Sturgeon Acipenser gueldenstaedtii

Evaluation of Candidate Housekeeping Genes for the Normalization of RT-qPCR Analysis using Developing Embryos and Prolarvae in Russian Sturgeon Acipenser gueldenstaedtii

Evaluation of Candidate Housekeeping Genes for the Normalization of RT-qPCR Analysis using Developing Embryos and Prolarvae in Russian Sturgeon Acipenser gueldenstaedtii

Bacterial pathogens and health problems of Acipenser gueldenstaedtii and Acipenser baerii sturgeons reared in the eastern Black Sea region of Turkey.

Farming sturgeons is an economically important practice in a number of Asian and European countries. However, since it is not widely implementedin Turkey, fertilized eggs necessary for research and industrial activities are imported from Germany. Due to the interest of several fish farms in culturing sturgeon in Turkey and the lack of relevant data, this study investigated bacteria related health problems of two different sturgeon species, the diamond sturgeon (Acipenser gueldenstaedtii) and the Siberian sturgeon (Acipenser baerii). The fungal, parasitic and bacterial pathogens found in these fish were investigated until the fish reached about 3 kg of weight (3+ years). A number of bacterial disease pathogens (Acinetobacter radioresistens, some Aeromonas and Pseudomonas species and Bacillus mycoides) and parasite Trichodina sp. and fungus Saprolegnia sp. were identified in the fish. Both phenotypic and molecular characterizations of the isolated bacteria were performed. Furthermore, swim bladder and spinal problems, cannibalism, tumor growth and mechanical injuries on the external surface of the fish were observed during the study period.

Parasitic worms and their histopathological effects in four sturgeon species from the southwest shores of the Caspian Sea

This study conducted to provide the status of parasite communities of four sturgeon species viz. Acipenser stellatus , A. gueldenstaedtii , A. nudiventris , and Huso huso in the southwest of the Caspian Sea and their histopathological effects on the examined fishes. For this purpose a total of 93 individuals of four sturgeon species were caught in two fisheries regions from the southwest of the Caspian Sea (Guilan Province, Iran) from March 2010 to May 2011. The histological slides of the infested tissues of the examined fishes were prepared for study of the histopathological effects of the parasites. Classical epidemiological variables, including mean intensity, prevalence, abundance and dominance were calculated for overall samples, grouped by season, geographical region, and sex. Five worm species, including two nematodes ( Cucullanus sphaerocephalus and Eustrongylides excisus larvae), one cestode ( Bothrimonus fallax ), one acanthocephalans ( Leptorhynchoide plagicephalus ) and one digenean trematode ( Skrjabinopsolus semiarmatus ) were found in examined sturgeons and their histopathological effects on the fish tissues were assessed. Based on the results, the diversity of the parasites (including freshwater ones) in the southern part of the Caspian Sea have decreased since the time of the first study in 1972. This may be related to unfavorable conditions in freshwater ecosystems.

The influence of hydrochemical and hydrological factors on the qualitative and quantitative structure of ichthyofauna from predeltaic Danube area.

Thepaper is presenting some aspects regarding the influence of environmentalfactors on fish communities structure from Danube, between Siret River and PrutRiver mouth. Fish were collected from March to December 2010 in four fishingareas. During the year, 12064.23 kg, respectively 14692 fish of 29 species werecollected. Cyprinidae, the dominant family, 55.17% in term of number of species, was represented by 16 species (Cyprinus carpio, Carassius gibelio, Barbusbarbus, Abramis brama, Abramis sapa, Blicca bjoerkna, Leuciscus idus, Vimba vimba, Aspius aspius, Pelecus cultratus,Chondrostoma nasus, Ctenopharingodon idella, Hypophthalmichthys molitrix,Hypophthalmichthys nobilis, Scardinius erythrophthalmus, Rutilus rutilus).Other families had the following structure: Percidae (17.24%) with 5 species (Sanderlucioperca, Zingel zingel, Zingel streber, Perca fluviatilis, Gymnocephalusschraetzer), Acipenseridae (13.79%) with 4 species (Huso huso,Acipenser stellatus, Acipenser ruthenus, Acipenser gueldenstaedtii), Clupeidae (6.90%) with two species (Alosa immaculata, Alosa tanaica), Siluridae (3.45%) with one species (Silurus glanis) and Esocidae (3.45%) with one species (Esox lucius). The highest capture was 8217.62 kg (68.12%), duringthe spring season (March-May), followed by autumn season (September–November), with 1437.56 kg (11.92%). The water level and water flow showed highcorrelation with both number and total catch, respectively.

State of the hypophysis in the hiemal and vernal forms of the Russian sturgeon Acipenser Gueldenstaedtii of the Volga after holding and hormonal treatment

Hiemal and vernal forms of Russian Sturgeon Aci� penser gueldenstaedtii (Barannikova, 1975) migrating to the Volga to spawn with a different state of sex glands are described in its VolgaCaspian population. The relatively scanty vernal form and more numerous hiemal sturgeon, whose migration continues from ver� nal to autumn, are usually distinguished. The sum� mermigrant hiemal sturgeon is the farthest from maturity at the beginning of the river period of anadro� mous migration, and the autumnmigrant hiemal sturgeon goes into the river with more mature sex products. The vernal sturgeon migrates into the river in a state close to maturity in vernal and, after it is kept for a short period at fish hatcheries, mature sex cells are obtained from it with the help of hormonal injections. High basophilic cells that are close to the completion of the secretory cycle and are gonadotropes dominate in the distal pituitary lobe of these sturgeons, mainly in the ventral zone. The analysis of the ultrastructure has shown the presence of dark and light cells rich in the secretion as well as pictures of exhaustion of separate gonadotropes (Barannikova et al., 1984).

Effect of formulated diet versus live food on growth and survival of Russian sturgeon (Acipenser guldenstaedti) larvae starting exogenous feeding.

This paper presents the technological results of rearing the Russian sturgeon (Acipenser guldenstaedti, Brandt, 1833) larvae in the conditions of the reproduction station from Issacea branch of S.C. Kaviar House S.R.L. Growth performance of these hatched-produced larvae was assessed after 32 days of rearing experiment on three different diets (live, artificial and mixed food). The gained results confirmed the possibility of a reasonable growth (specific growth rate of 9.63 %BW/d and daily growth rate 34,4 mg/d) and feed utilization (feed conversion ratio equal to 2.28), in the context of maintaining a good body condition (average k factor equal to 1.36±0.23), for the fish group fed on artificial diet. The low survival rate showed however that not all larvae are fully equipped and adapted to process hydrolyzed fodder. A model equation for quantifying sturgeon growth in this early life stage was established.

Molecular Characterization of Testis Differentiation in the Siberian Sturgeon, Acipenser baerii

Molecular Characterization of Testis Differentiation in the Siberian Sturgeon, Acipenser baerii

Isolation and characterization of Lactobacillus species from intestinal contents of beluga (Huso huso) and Persian sturgeon (Acipenser persicus)

Summary Lactic acid bacteria are characterized as gram-positive, usually non-motile, non-sporulating bacteria that produce lactic acid as a major or sole product of their fermentative metabolism. In this study, the presence of lactobacilli were investigated in the intestines of beluga (Huso huso) and Persian sturgeon (Acipenser persicus), inhabiting Caspian sea. The obtained data showed that various species of lactobacilli populations were found at high levels in the intestines of fishes. Total number of lactobacilli was about 10 5.3 and 10 6.4 cfu/g of intestinal content for beluga and Persian sturgeon, respectively. Physiological and biochemical characteristics of 84 strains isolated from intestines of beluga and Persian sturgeon revealed that these strains can be categorized into 2 metabolic groups; facultative and obligate heterofermentatives. The most common presumptive lactobacilli species were Lactobacillus sakei and Lactobacillus plantarum. The current study is the first report on the isolation of lactobacilli from the intestine of beluga and Persian sturgeon.

Intensive reproduction system for Chinese sturgeon (Acipenser sinensis) larvae and fingering

Intensive reproduction system for Chinese sturgeon (Acipenser sinensis) larvae and fingering

Blood serum osmotic and ionic regulation of wild adults and reared juvenile Persian sturgeon, Acipenser persicus

Blood serum osmotic and ionic regulation of wild adults and reared juvenile Persian sturgeon, Acipenser persicus

Determinants of growth and body condition of lake sturgeon (Acipenser fulvescens)

Determinants of variations in growth in length and body condition of lake sturgeon (Acipenser fulvescens) were studied on 32 lake and river systems covering most of the distribution of the species. The average of mean total lengths at ages 23.27 years and the weight of a 1000-mm specimen were chosen as growth and condition indicators. A latitudinal gradient in temperature, pH, and conductivity characterizes the eastern part of the distribution (£80°W) whereas the western part (>80°W) shows essentially the same temperature gradient but relatively high and stable pH and conductivity values from south to north. Growth decreases with mean annual air temperature and latitude in both sectors, but it is generally faster in the west than in the east. Although mean annual air temperature was the best individual predictor of growth (R2 = 0.53), a multivariate model incorporating latitude and longitude explained a higher proportion of the variation in the dependent variable (R2 = 0.67). Condition decreases with latitude in the east but remains relatively stable in the west. pH was the best individual predictor of condition (R2 = 0.43). Le determinisme de la croissance en longueur et de la condition chez l’esturgeon jaune (Acipenser fulvescens) a ete etudie au sein de 32 systemes de lacs et de rivieres couvrant la majeure partie de l’aire de distribution de l’espece. La moyenne de la longueur totale moyenne aux âges 23 a 27 et le poids a 1000 mm ont ete choisis comme indicateurs de la croissance et de la condition. Un gradient latitudinal de temperature, pH et conductivite caracterise la partie est de l’aire de distribution (£80°W), alors que la partie ouest (>80°W) affiche essentiellement le meme gradient de temperature, mais des pH et conductivites relativement eleves et stables du sud au nord. La croissance, generalement plus rapide dans l’ouest, diminue avec la latitude dans les deux secteurs. Bien que la temperature annuelle moyenne de l'air ait ete le meilleur predicteur de la croissance (R2 = 0.53), un modele multivarie incorporant la latitude et la longitude a explique une plus forte proportion de la variation de la croissance (R2 = 0.67). La condition diminue avec la latitude dans l’est, mais demeure relativement stable dans l’ouest. Le pH a ete le meilleur predicteur de la condition (R2 = 0.43).

Use of ultrasonic telemetry to locate the spawning area of Chinese sturgeons

Gezhouba Dam was built in 1981 across the Yangtze River at Yichang, Hubei Prov-ince, China. It blocked the upstream spawning migration of all anadromous species offish, including the Chinese sturgeon Acipenser sinensis. Although the main historicalspawing areas of Chinese sturgeons were far upstream of the dam, successful spawning inthe reach below the dam has been documented each year since 1982 by collecting spawned

Reproduction of Shortnose Sturgeon (Acipenser brevirostrum) in Holyoke Pool, Connecticut River, Massachusetts

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Daily Movements of Shortnose Sturgeon, Acipenser brevirostrum, in a Maine Estuary

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Errata

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