Dynamics and condition of fish stocks in the Rybinsk Reservoir in the period 1950–2010

Gerasimov, Yu. V.; Strelnikov, A. S.; Brazhnik, S. Yu.

doi:10.7868/s0042875213040012

Cited by 3 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Discussionmentioning

confidence: 99%

“…In different waterbodies, the growth rate of catfish varies widely (Gerasimov, 2015; Severov, 2020). Thus, in the Rybinsk reservoir, the catfish length of 38–55.5 cm corresponds to the age of 3–5 years, and catfish 68–93.5 cm long corresponds to 7–9 years (Gerasimov, 2015). Meanwhile in Western Europe (Rhine River), 2‐ to 3‐year‐old catfish are 40–60 cm long, reaching 70–90 cm length by 4–5 years (Copp et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…In some cases, the percentage inhibition values of trypsin and chymotrypsin activity by the studied cestodes were comparable to those observed when applying the synthetic inhibitors TLCK and TPCK specific for trypsin and chymotrypsin, respectively (Tables 1 and 2). In different waterbodies, the growth rate of catfish varies widely (Gerasimov, 2015;Severov, 2020). Thus, in the Rybinsk reservoir, the catfish length of 38-55.5 cm corresponds to the age of 3-5 years, and catfish 68-93.5 cm long corresponds to 7-9 years (Gerasimov, 2015).…”

Section: Influence Of Cestodes S Siluri On the Proteolytic Activity O...mentioning

confidence: 99%

“…The catfish range covers vast areas (Kuzishchin et al, 2018), including the upper reaches of the Volga River. In the Upper Volga reservoirs located close to the northern limit of the catfish range, the abundance of the species is low, but it tends to increase as a result of climate warming (Gerasimov, 2015). Despite the obvious interest in catfish as an object of fisheries, many aspects of its life remain obscure.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

First insights into the activity of major digestive enzymes in the intestine of the European catfish Silurus glanis and protective anti‐enzymatic potential of its gut parasite Silurotaenia siluri

Фролова

Извеков

Извекова

2023

Journal of Fish Biology

View full text Add to dashboard Cite

The European catfish Silurus glanis is attracting growing interest as an object of fisheries and aquaculture, which is reinforced by the expansion of its natural range under climate change. Shaping the effective exploitation strategy for this valuable species requires detailed knowledge of its biology, including feeding and digestion processes, especially near the natural limits of the species range. Meanwhile, the digestion physiology of the European catfish remains poorly explored, including the activity of major digestive enzymes and the possible effect of intestinal parasites on this activity. In this regard, the activity of proteinases and α‐amylase in the intestinal mucosa of the catfish was studied. Adult catfish were collected in the Rybinsk reservoir (Upper Volga) located close to the northern limit of the species range. It was shown that all subclasses of intestinal digestive proteinases, including serine proteinases, metalloproteases and cysteine (thiol) proteinases, function in the gut mucosa of the catfish. The mucosal levels of total proteolytic activity depended on fish size, in contrast to those of trypsin, chymotrypsin and α‐amylase. The level of chymotrypsin activity was significantly higher than that of trypsin activity. It was also found that the incubation medium and extract of the cestodes Silurotaenia siluri parasitizing the catfish gut had a significant inhibitory effect on the activity of serine proteases (trypsin and chymotrypsin) operating in the intestines of the host fish.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Influence Of Cestodes S Siluri On the Proteolytic Activity O...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

First insights into the activity of major digestive enzymes in the intestine of the European catfish Silurus glanis and protective anti‐enzymatic potential of its gut parasite Silurotaenia siluri

Фролова

Извеков

Извекова

2023

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

“…Chironomid larvae play an im-portant role in aquatic food chains (Zilli et al, 2008). Their abundant populations are significant in aquatic food chains because larval chironomids can be a food source for larger invertebrates (Pinder, 1986) and fish (Gerking, 1994;Kamler et al, 2008;Gerasimov, 2015). They are favourite feed objects of various benthophages (Ivanova et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Effect of crystalline and amorphic phenol on characteristics of peptidases and glycosidases in chironomid larvae

Кузьмина

Chornaya²,

Kulivatskaya

et al. 2020

Biosys. divers.

View full text Add to dashboard Cite

The effects of crystalline and amorphous phenol (0.5 mmol/L) on the characteristics of glycosidases, as well as casein-lytic and hemoglobin-lytic peptidases, which function in the whole body of chironomid larvae Chironomus sp. were studied. Crystalline phenol decreased the activity of glycosidases in comparison to the control in the temperature range 0–50 ºС, amorphous phenol – in the temperature range 0–70 ºС. The temperature optimum of glycosidases in whole body of chironomid larvae in control and experiment corresponds to 50 ºС. The activity of glycosidases in comparison to the control decreased in the pH range 5–11 (to a greater extent in the case of the lower fraction). Amorphous phenol increased the activity of casein-lytic peptidases in comparison to the control in the temperature range of 30–50 ºС, hemoglobin-lytic peptidases – in the temperature range of 0–60 ºС. The degree of the increase of enzyme activity in the temperature optimum zone of casein-lytic and hemoglobin-lytic peptidases was different: the level of enzyme activity in the experiment was higher than in the control by 2.3 and 1.8 times, respectively. The temperature optimum of the studied peptidases of chironomid larvae, regardless of the experimental conditions, corresponds to 40 °C. Crystalline phenol did not actually affect the Q10 values of glycosidases in the temperature range 0–50 °C. Amorphous phenol decreased the Q10 values at a temperature of 40–50 °C. The Q10 values of casein-lytic peptidases increased in most cases, the Q10 values of hemoglobin-lytic peptidases decreased in the presence of amorphous phenol. The process of protein hydrolysis was characterized by a break in the Arrhenius plot at 20 °C. The values of Еact in the range 0–20 °С were lower than in the zone of higher temperatures. The Еact values of the process of casein hydrolysis by peptidases of all tissues of chironomid larvae in the presence of amorphous phenol in both temperature zones increased. The Еact values of the process of hemoglobin hydrolysis by peptidases of all tissues of chironomid larvae in the presence of amorphous phenol in both temperature zones decreased. The Еact values of the process of starch hydrolysis in the presence of crystalline phenol decreased. The amorphous phenol changed the Еact values in different directions. They slightly increased in the presence of the phenol upper fraction, but they decreased in the presence of the phenol lower fraction. The data obtained indicate a significant effect of crystalline and amorphous phenol not only on activity, but also on the characteristics of peptidases and glycosidases that function in the whole body of chironomid larvae.

show abstract

The dynamics of industrial fish catches in inland waters of Russia in 2014–2023

Bykov,

Brazhnik,

Borkichev

2024

View full text Add to dashboard Cite

Based on the results of generalization of long-term data on the volume of industrial fishing in freshwater bodies of Russia for 2014–2023, a comprehensive analysis of the state of industrial fishing for the period under review was carried out.The purpose of the work is to analyze the dynamics of quantitative indicators and the qualitative composition of commercial catches in freshwater bodies of Russia.Methods used: official annual data on the volume of industrial fish catch in freshwater bodies of Russia for 2014–2023 received from the territorial departments of Rosrybolovstvo were processed in accordance with modern statistical accounting standards.Novelty: new data on the state of industrial fishing in freshwater bodies of Russia for 2014–2023 are summarized and analyzed.According to the results of the analysis, it was found that there was a significant increase in industrial catch (by 3–10 times) in freshwater bodies of Russia in the period from 2014 to 2023, it was observed only in the water bodies of the West Siberian fisheries basin, mainly due to more intensive exploitation of reserves of the raw material base of small–scale species in the lake fund of the region. The remaining fisheries basins have been characterized by stagnation of catch over the past ten years, and in some basins (Western) there is a tendency to decrease it. The trend of decreasing the volume of catch of valuable fishing objects (primarily long-cycle whitefish species) has not changed over the described period, their share in the rivers of the ObIrtysh and Yenisei basins continues to decrease.Practical significance: the results of the analysis of industrial fishing in freshwater bodies of Russia for 2014– 2023 at the present stage of research allow us to assess the prospects for the development of the freshwater component of the fisheries complex in certain regions, identify problems related to the development of fishing on rivers, lakes and reservoirs and work out ways to solve them.

show abstract

Dynamics and condition of fish stocks in the Rybinsk Reservoir in the period 1950–2010

Cited by 3 publications

References 0 publications

First insights into the activity of major digestive enzymes in the intestine of the European catfish Silurus glanis and protective anti‐enzymatic potential of its gut parasite Silurotaenia siluri

First insights into the activity of major digestive enzymes in the intestine of the European catfish Silurus glanis and protective anti‐enzymatic potential of its gut parasite Silurotaenia siluri

Effect of crystalline and amorphic phenol on characteristics of peptidases and glycosidases in chironomid larvae

The dynamics of industrial fish catches in inland waters of Russia in 2014–2023

Contact Info

Product

Resources

About