Ашық рұқсат
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Тек жазылушылар үшін
Том 65, № 4 (2025)
Articles
DESCRIPTION OF LARVAE AND JUVENILES OF STONE COCKSCOMB ALECTRIAS ALECTROLOPHUS (STICHAEIDAE) FROM AVACHINSKAYA BAY (SOUTHEASTERN KAMCHATKA)
Аннотация
An illustrated description of early larvae of stone cockscomb Alectrias alectrolophus from Avacha Bay is provided. Early larvae have a transparent body. As they develop, a complex pigmentation pattern appears on the body. The pigmentation of juveniles is dark, almost black, the pattern is poorly expressed. As they develop, the length of the head and the height of the body decrease relative to the length of the body. The length of the snout, the length of the upper jaw, and the diameter of the eye slightly increase relative to the length of the head. During growth, the length of the pectoral fin decreases significantly. Development of larvae and juveniles occurs in the intertidal zone.
Journal of Ichthyology. 2025;65(4):393-406
393-406
The olfactory organ of the barramundi Lates calcarifer (Latidae)
Аннотация
The olfactory organ of the barramundi Lates calcarifer has an anterior nostril in the form of a short forward-facing tube, a posterior nostril without a valve, an olfactory rosette of a arrow-shaped type located on the medial side of the olfactory cavity, and two ventilation sacs. The nostrils are separated by a nasal bridge without a veliform ridge, the relative width of the bridge decreases with age of the fish. The olfactory lamellae fill the entire olfactory cavity, in juveniles with a body length of 4.9–6.8 cm there are 15–19 of them, in males at first maturity with a body length of 59.0 and 60.0 cm — 55 and 53 of them. A large number of lamellae indicates high functional capabilities of the olfaction. New lamellae are formed in the rostral part of the rosette, as the fish grows, they become larger and thicker, their shape changes. Secondary folding is absent. With age, the relative width of the septum increases. The lacrimal ventilation sac is larger than the ethmoidal one, the sac openings are located near the central part of the rosette, ventral and dorsal to it, respectively. When the jaws are opened and the ventilation sacs are expanded, water enters the olfactory organ (the septum) through the anterior nostril, is divided into microstreams, passes between the lamellae and goes into the ventilation sacs. When the jaws are closed and the sacs are compressed, water is ejected through the posterior nostril. The protrusion on the caudal side of the internal opening of the anterior nostril is a morphological adaptation that ensures the separation of incoming and outgoing water flows. The study confirms the assumption that sensory specialization in barramundi is not expressed and different systems make similarly significant contributions to obtaining biologically important information about the environment.
Journal of Ichthyology. 2025;65(4):407-418
407-418
Anomalies of the axial skeleton in juvenile leuciscid fish (Leuciscidae) of Saratov reservoir
Аннотация
Data on the diversity and occurrence of anomalies in the development of the axial skeleton are presented for juveniles of six cyprinid fish species of Saratov Reservoir: roach Rutilus rutilus Linnaeus, 1758, bleak Alburnus alburnus Linnaeus, 1758, ide Leuciscus idus Linnaeus, 1758, bream Abramis brama Linnaeus, 1758, rudd Scardinius erythrophthalmus Linnaeus, 1758, and white bream Blicca bjoerkna Linnaeus, 1758. In total, 4 main types of axial skeletal abnormalities of varying severity and localization were diagnosed: scoliosis, lordosis, kyphosis, and underdevelopment of the caudal spine. The proportion of individuals with spinal disorders ranged from 0.5 in bream to 2.3% in bleak. The proportion of axial skeletal anomalies among other detected disorders ranged from 2.0 in bream to 9.9% in bleak, while the total proportion of abnormal individuals in the studied samples varied from 23.4 to 38.4%. There is a tendency of increasing the frequency of occurrence of axial skeleton anomalies in fish fry of the Saratov Reservoir with an increase of the anthropogenic load at different stations of the Reservoir.
Journal of Ichthyology. 2025;65(4):419-431
419-431
On the finding of a spawning male of Eumicrotremus taranetzi with comments on validity of E. tartaricus (Cyclopteridae, Cottoidei)
Аннотация
A spawning male of Eumicrotremus taranetzi has been found and described for the first time The species belonging to this group is indicated by the significant number and arrangement of bone plaques, as well as their shape — flattened, rising towards the center in the form of a cone, on the radially striated lateral surface there are a few thin and short spines, invisible on an X-ray, and two or three larger spines at the top. In the spawning male, the bone plaques on the head and body are significantly reduced to the point of complete disappearance, in which case circles with black pigment remain along the edges in place of the original boundaries of the bone plaques. A comparison was made with closely related species from the “orbis” group — a spawning male of E. orbis and type specimens of E. tartaricus. The problem of the validity of E. tartaricus, which is recognized as an independent species, has been discussed.
Journal of Ichthyology. 2025;65(4):432-440
432-440
DIFFERENTIATION AND RELATIONSHIPS OF THE FAMILY HEMITRIPTERIDAE ACCORDING TO DNA VARIABILITY DATA
Аннотация
Species of the family Hemitripteridae have been studied using analysis of variability of molecular markers: COI genes, Cyt b, 16S rRNA of the mitochondrial genome, and RAG1 of the nuclear genome. Nucleotide substitutions common to the species of the genera Blepsias and Hemitripterus have been found in the sequences of mitochondrial genes. A monophyly of the family within Blepsias and Hemitripterus is shown based on molecular phylogeny. The species of the genus Nautichthys are significantly differentiated from sea ravens; it has been suggested that they should be removed from the family Hemitripteridae. The sister relationships of the families Hemitripteridae and Agonidae have been confirmed.
Journal of Ichthyology. 2025;65(4):441-456
441-456
Biological characteristics and state of the least cisco Coregonus sardinella (Salmonidae) fishery in the Yana River of the Republic of Sakha (Yakutia)
Аннотация
According to the materials of 2019–2021, it is shown that there were no significant changes in the biological parameters of the individuals of the commercial stock of the least cisco Coregonus sardinella in the Yana River of the Republic of Sakha (Yakutia) for three years. Some increase in the average values of fish length and weight in 2021 was due to a shift in their age structure towards an increase in the number of individuals of older age groups and alignment of the sex ratio. Analysis of the fishery status of the species for 2011–2021 showed two shifts in the dominant age groups of least cisco in the catches. In the first two years of the last decade, fishery was based on fish aged 4+ and 5+, then the main proportion in the fishery was made up of individuals aged 5+ and 6+. By the beginning of the current decade, the situation had returned to its original level. In general, the dynamics of the lest cisco fishery in the Yana River is characterized by stability, the harvesting does not cause serious damage to the number of the species, the current state of stocks of which in the river is satisfactory. The results make it possible to predict an increase in the abundance of the studied population.
Journal of Ichthyology. 2025;65(4):457-465
457-465
Changes in the diet of the zander Sander lucioperca (Percidae) in the Kama Reservoir as a result of invasion of an alien species the Black and Caspian Sea sprat Clupeonella cultriventris (Ehiravidae)
Аннотация
In the modern period, the role of native species, the roach Rutilus rutilus and perch Perca fluviatilis, has significantly decreased in the diet of the zander Sander lucioperca in the Kama Reservoir in comparison with the retrospective data, and their place has been taken by the Black Sea and the Caspian Sea sprat Clupeonella cultriventris, which was most intensively fed by zander in August and September. The occurrence of the Black Sea and Caspian Sea sprat in stomachs of zander was lower in May and especially in October, which may be related to the dynamics of its abundance and seasonal movements in the reservoir. Juvenile zander with a standard length of less than 40 cm is characterized by a decrease in the average body length of the consumed sprat with an increase in the size of the predator, whereas the opposite was found for adult individuals. This dependence can be explained by a high feeding rate of zander juveniles and low selectivity of this group of fish when hunting for sprat, as well as by the dynamics of the size composition of sprat in the reservoir. The Black Sea and the Caspian Sea sprat is currently the dominant food object of zander in the Kama Reservoir.
Journal of Ichthyology. 2025;65(4):466-479
466-479
Effect of transient thyrotoxicosis and hypothyroidism on the rheoreaction of zebrafish Danio rerio (Danionidae)
Аннотация
The effect of transient thyrotoxicosis and hypothyroidism on the metabolism and rheoreaction of zebrafish Danio rerio. has been studied. Thyrotoxicosis was induced by administrating triiodothyronine (T3) at a concentration of 10 ng/g in aquarium water. Hypothyroidism was provoked by suppressing the thyroid activity with goitrogen, 0.05% thiourea. It has been found that thyrotoxicosis leads to an increase in the standard metabolic rate, whereas hypothyroidism causes its decrease, as well as a decrease in the swimming performance of the experimental fish. The concentration of T3 affects the locomotor activity and characteristics of the motivational component of the zebrafish rheoreaction. The higher the concentrations of T3, the greater the probability of the positive type of rheoreaction (fish movements against the current).
Journal of Ichthyology. 2025;65(4):480-492
480-492
Changes in Na+/K+-ATPASE activity and biomembrane lipid composition in smolts of pink salmon Oncorhynchus gorbuscha (Salmonidae) during their downstream migration in the Indera River (White Sea basin)
Аннотация
The article presents the results of the study of the activity of Na+/K+-ATPase and the content of individual lipid components associated with the regulation of the activity of this enzyme in smolts of pink salmon Oncorhynchus gorbuscha during their downstream migration from the Indera River to the White Sea. Changes in both the enzyme activity and values of a number of lipid parameters have been recorded in an experiment in which the juveniles were kept for 24 and 72 h in river (at a salinity of less than 1‰), estuarine (6‰), and sea (30‰) water in cages established in their natural habitat. The results suggest that the increased resistance of pink salmon individuals to changes in environmental factors (salinity and temperature) during downstream migration to estuarine and sea water is accompanied by a change in the activity of Na+/K+-ATPase, which significantly increased in the experiment after 24-h stay of juveniles in sea water and less significantly increased after 24-h stay in the estuarine water. The prolongation of exposure to the estuarine and sea water to 72 h did not induce a further increase in Na+/K+-ATPase activity in pink salmon individuals. The revealed changes in the lipid content in the experimental groups can be determined not only by changes in the environmental factors, but also by the physiological and biochemical state of the juveniles.
Journal of Ichthyology. 2025;65(4):493-508
493-508