Изменчивость Цитогенетических Показателей Сиговых Рыб Обь-Иртышского Бассейна

The research aims to study the capability of para-aminobenzoic acid (PABA) to impact the resiliency of a valuable species of cisco fishes – broad whitefish (Coregonus nasus (Pallas, 1776)) – at the early stages of devel-opment. Immediately upon fertilization the fish roe was treated with PABA solutions in low concentrations of 0,01; 0,005; 0,001; 0,0005; 0,0001; 0,00005; 0,00001% during 2 and 4 hours. The control group was not treated with PABA. The study revealed an increase in sack fry output in all experimental variations. The best indications were registered in variations with 0.00005% PABA solution that produced the sac fry output 23.3% higher than an indication in the control group. The subsequent breeding of alevins during 34 days period also confirmed the positive impact of PABA. The treatment of fertilized roe with PABA solution in concentration of 0.00005% increases the alevin survivability by 5.9%, the alevin average weight increases by 5.1 mg. in comparison with the control group. The best results in fry breeding were acquired in the experimental variation with 0.0001% PABA solution: the alevin survivability was by 15.6% higher than in the control group; an average weight of tested alevins exceeded an average weight of alevins in the control group by 8.6 mg. Cytogenetic analysis showed that the treatment of roe with PABA decreases the rates of chromosomal distortions of broad whitefish by 1.5-2 times in comparison with the control group on the gastrula stage. These results demonstrate the ability of PABA to increase both the survivability and the growth speed of broad whitefish on its early stages of ontogenesis, which can be used in raising the efficiency of industrial fish reproduction.

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Effect of low concentrations of para-aminobenzoic acid on viability of broad whitefish Coregonus nasus (Pallas, 1776) at early stages of ontogeny

Kotov

Pak

Sergienko³

et al. 2022

Vestnik of Astrakhan State Technical University. Series: Fishing Industry

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Increasing the Biopottential of Coregonus Muksun by Ultra-Weak Pulse Magnetic Fields in Fish Farming Conditions

Selyukova,

Pischenko,

Efremova

et al. 2023

Fisheries

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The results of a production experiment with juvenile muksun carried out at the Sob fish hatchery (Kharp village, Yamal-Nenets Autonomous Okrug) are presented. The purpose of the experiment, as an important element in the compensatory measure for the reproduction of valuable fish species, was to increase the biopotential of juveniles for their release into the Ob. For several days before hatching, the embryos were treated with ultra-weak pulsed magnetic fields in a specific frequency range. In the postembryonic period, control and experimental muksun juveniles were studied using morphometric and cytological-histological methods. It was established that the experimental juveniles during the entire growing period exceeded the control ones in most parameters, and before release into the Ob River for feeding, the weight of the experimental muksun fry significantly exceeded the weight of the control juveniles. When assessing the nature and degree of connection between morphometric parameters using cluster analysis, it was shown that by the time the experiment was completed, a higher correlation between traits was observed in the experimental juveniles, which is additional confirmation of its increased balance in the development process. The level of formation of the gonads of the reproductive system in the experimental individuals also exceeded the development of the gonads of the control ones - in terms of size and rate of sexual differentiation, number and cytometric indicators of germ cells. The data obtained allow us to consider it advisable to apply this approach in the practice of compensatory fish farming.

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Изменчивость Цитогенетических Показателей Сиговых Рыб Обь-Иртышского Бассейна

Cited by 2 publications

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Effect of low concentrations of para-aminobenzoic acid on viability of broad whitefish Coregonus nasus (Pallas, 1776) at early stages of ontogeny

Effect of low concentrations of para-aminobenzoic acid on viability of broad whitefish Coregonus nasus (Pallas, 1776) at early stages of ontogeny

Increasing the Biopottential of Coregonus Muksun by Ultra-Weak Pulse Magnetic Fields in Fish Farming Conditions

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