scholarly journals Harvest Rates of Rheophilic Fish Vimba vimba, Chondrostoma nasus, and Barbus barbus Have a Strong Relationship with Restocking Rates and Harvest Rates of Their Predator Silurus glanis in Lowland Mesotrophic Rivers in Central Europe

2021 ◽  
Vol 13 (20) ◽  
pp. 11379
Author(s):  
Roman Lyach
Keyword(s):  
Fish Species ◽  
Negative Relationship ◽  
Additive Model ◽  
Strong Relationship ◽  
Harvest Rate ◽  
Silurus Glanis ◽  
Barbus Barbus ◽  
Chondrostoma Nasus ◽  
Fish Harvest ◽  
Rheophilic Fish

The European catfish Silurus glanis (Linnaeus, 1758) is an expanding apex piscivorous predator whose predation may drive fish harvest rates and fish populations. This study aimed to analyze the relationships between intensive catfish stocking/harvesting and harvest rates of putative catfish prey–three rheophilic fish species: vimba bream Vimba vimba, nase Chondrostoma nasus, and barbel Barbus barbus (Linnaeus, 1758). The GAM (generalized additive model) was used to analyze the relationships between the harvest rate and the stocking intensity rate of the catfish and the three rheophilic fish species. The harvest rates and stocking intensity rates were obtained from mandatory angling logbooks collected from 38,000 individual recreational anglers by the Czech Fishing Union on 176 fishing sites over the years 2005–2017 in central Bohemia and Prague (the Czech Republic). Our results show that a higher intensity of catfish stocking and harvesting resulted in a lower harvest rate of rheophilic fishes. Conversely, the stocking rates of rheophilic fishes were not significantly correlated to their harvest rates. In conclusion, a significant negative relationship was found between the harvest rate and the restocking rates of rheophilic fishes and their predator, suggesting that fisheries managers should not perform intensive stocking of both catfish and rheophilic fishes on the same rivers.

scholarly journals Comparison of ovarian cycles of Hungarian riverine fish species representing different spawning strategies 441

2008 ◽  
Vol 53 (No. 10) ◽  
pp. 441-452 ◽  
Author(s):  
K.K. Lefler ◽  
Á. Hegyi ◽  
F. Baska ◽  
J. Gál ◽  
Á. Horváth ◽  
...  
Keyword(s):  
Fish Species ◽  
Ovarian Cycle ◽  
Spawning Period ◽  
Barbus Barbus ◽  
Chondrostoma Nasus ◽  
Leuciscus Idus ◽  
Riverine Fish ◽  
White Bream ◽  
Heterogeneous Size

Investigations on the ovarian cycle of fish species that inhabit Hungarian rivers are necessitated by both environmental and economic reasons. The objective of our research was to explore new fundamental knowledge concerning the ovarian cycle of the white bream (<I>Blicca bjoerkna</I>, Linnaeus, 1758), barbel (<I>Barbus barbus</I>, Linnaeus, 1758), orfe <I>(Leuciscus idus</I>, Linnaeus, 1758) and nase (<I>Chondrostoma nasus</I>, Linnaeus, 1758). Histological investigation of ovaries and determination of proportions of oocytes in different stages of development is an appropriate method for the description of spawning characteristics of these species. Our results show that the GSI value for all four investigated species starts to increase at the end of summer and reaches its maximum before spawning. In the barbel and white bream, the presence of oocytes in the stage of cortical alveoli and the heterogeneous size of oocytes in the stage of vitellogenesis in the pre-spawning period indicate that barbel and white bream are multiple spawners. In contrast, in the orfe and nase, the absence of oocytes in the stage of cortical alveoli and the homogeneous size of cells in the stage of vitellogenesis indicate that orfe and nase are single spawners.

Assessment of Spawning and Nursery Areas in the River Meuse

1994 ◽  
Vol 29 (3) ◽  
pp. 297-299 ◽  
Author(s):  
F. T. Vriese ◽  
S. Semmekrot ◽  
A. J. P. Raat
Keyword(s):  
Fish Species ◽  
Perca Fluviatilis ◽  
Main Stream ◽  
Nursery Areas ◽  
Barbus Barbus ◽  
River Meuse ◽  
Perch Perca Fluviatilis ◽  
Chondrostoma Nasus ◽  
Leuciscus Idus ◽  
Tench Tinca Tinca

In commission of Rijkswaterstaat Directorate Limburg, a desk study was carried out by the OVB to assess whether fish species in the river Meuse are restricted in their abundance and distribution by the lack of appropriate spawning habitat. The area studied comprises the Dutch part of the river between Eijsden and Hedel, including old river arms and former gravel pits connected with the main stream. Not included in the study is the Grensmaas, a non-canalised stretch of the river. A total of 21 fish species were selected, whose habitat requirements regarding spawning and growth were collected by a literature survey. The assessment was made by relating habitat-associated factors (water depth, rate of flow, substratum, macrophytes) with fish-specific requirements on spawning and growth. Thus it was possible to assess per river section of 100 meters length its potential suitability as spawning and nursery area for 17 species. It was concluded that no potential spawning and nursery areas are available for barbel (Barbus barbus), chub (Leuciscus cephalus), nose carp (Chondrostoma nasus) and dace (Leuciscus leuciscus). The presence of these species in the study area can be explained by migration out of the Grensmaas. Only on 1.5 % of the total amount of river sections macrophytes are present, which obviously limits the possibilities for the phytophilic species pike (Esox lucius), tench (Tinca tinca), crucian carp (Carassius carassius), carp (Cyprinus carpio), bitterling (Rhode us sericeus amarus), white bream (Blicca bjoerkna) and rudd (Scardinius erythrophthalmus). For ide (Leuciscus idus), gudgeon (Gobio gobio), bleak (Alburnus alburnus), perch (Perca fluviatilis), pikeperch (Stizostedion hicioperca) and ruffe (Gymnocephalus cernua) potential spawning and nursery areas are abundantly present.

scholarly journals Correlation between Heavy Metal-Induced Histopathological Changes and Trophic Interactions between Different Fish Species

2021 ◽  
Vol 11 (9) ◽  
pp. 3760
Author(s):  
Bianca Onita (Mladin) ◽  
Paul Albu ◽  
Hildegard Herman ◽  
Cornel Balta ◽  
Vasile Lazar ◽  
...  
Keyword(s):  
Fish Species ◽  
Structural Changes ◽  
Atomic Absorption Spectrophotometry ◽  
Nuclear Antigen ◽  
Histopathological Changes ◽  
Barbus Barbus ◽  
Tnf Α ◽  
Repair Mechanisms ◽  
Carnivorous Species ◽  
Chondrostoma Nasus

This study assessed the distribution of heavy metals in the gills, kidney, and liver, correlated with the severity of histopathological changes, of three fish species with different feeding habitats (Barbus barbus, Squalius cephalus, and Chondrostoma nasus) from the Crișul Negru river, Romania. The levels of copper (Cu), chromium (Cr), cadmium (Cd), lead (Pb), and zinc (Zn) in fish tissues were measured by atomic absorption spectrophotometry. Histopathology and the expressions of TNF-α and proliferation cell nuclear antigen (PCNA) were investigated by immunohistochemistry and Western blot. Our data suggest a significant correlation between the bioconcentration level of metals and structural changes. The carnivorous species was the most affected compared to the omnivorous and herbivorous ones, and the most affected organ was the kidney. Moreover, the correlation of tissue damage with the PCNA and TNF-α expression levels revealed that the herbivorous species presented less extended lesions, likely due to higher activated repair mechanisms and lower levels of inflammation. In conclusion, our data and the subsequent statistical analysis suggest that feeding behavior could be correlated with the histopathological alterations and might be used for a more profound evaluation of aquatic environment safety and analysis of aquatic ecosystems.

CHARACTERISTICS OF FREE-RADICAL PROCESSES IN THE ORGANISMS OF SOME PREDATORY FISH SPECIES IN DIFFERENT SEASONS OF THE YEAR

2017 ◽  
pp. 117-123
Author(s):  
Nikolay Aleksandrovich Pudovkin ◽  
Peter Vladimirovich Smutnev
Keyword(s):  
Fish Species ◽  
Catalase Activity ◽  
Perca Fluviatilis ◽  
Selenium Concentration ◽  
The Body ◽  
Predatory Fish ◽  
Volga River ◽  
Silurus Glanis ◽  
Average Value ◽  
Pike Perch

The authors of the article have studied the content of the elements of anti-oxidant system (malondialdehyde, catalase, selenium) in tissues of the internal organs (gills, intestine, muscles, liver, swimbladder, scales) in some species of predatory fish (pike Esox lucius (L., 1758), perch Perca fluviatilis (L., 1758), pike-perch Sander lucioperca (L., 1758), catfish Silurus glanis ) widespread in the basin of the Volga river in the Saratov region. The lowest concentration of malondialdehyde in organisms of the studied fish species is observed in fall and winter; the highest - in spring and summer. Catalase activity in gills tissue of a pike raised in 11.8%, cat-fish - 9.1%, pike-perch - 7.5%, perch - 7.8%. In fall (compared to winter) enzyme activity lowering in gonads of pike-perch makes 16.3%, in gonads of perch - 14.4%. In other tissues there were not observed any evident changes of catalase activity. Fish species under consideration are listed according to the average value of selenium concentration in organisms, µg/g: pike (0.208) > catfish (0.207) > pike-perch (0.196) > perch (0.178). According to the average value of the selenium accumulation in the body in different season all the studied species can be placed in the following order, µg/g: winter-pike (0.132) > pike-perch (0.136) > perch and catfish (0.142); spring - pike-perch (0.190) > perch (0.191) > pike (0.208) > catfish (0.209); summer - perch (0.186) > pike-perch (0.190) > catfish and pike (0.203); autumn - perch (0.193) > pike-perch (0.268) > > catfish (0.274) > pike (0.289).

scholarly journals Length of productive life the cows of Simmental breed

2021 ◽  
Vol 213 (10) ◽  
pp. 31-39
Author(s):  
L. Ignat'eva ◽  
A. Sermyagin
Keyword(s):  
Milk Yield ◽  
Russian Federation ◽  
Negative Relationship ◽  
Strong Relationship ◽  
Cattle Breeding ◽  
Productive Life ◽  
The Russian Federation ◽  
The Republic ◽  
First Time ◽  
The Relationship

Abstract. The purpose of the research was to assess the duration of the length of productive life of Simmental cows. Methods. The research was carried out on Simmental cows bred in 14 regions of the Russian Federation, the total livestock was 8 832 heads. The calculation of the heritability coefficients and correlation (genetic and paratypic) was carried out by using the programs RENUMF90 and REMLF90. Results. A fairly strong relationship was established between the duration of a productive life (months) and the age of culling (lactations) r = +0.795, the length of productive life (months) and lifetime productivity within the range of +0.669…+0.714. However, the relationship between the age of culling (lactations) and lifetime productivity is moderate, from +0.261 to +0.316. A moderate negative relationship was obtained between the age of culling (lactations) and milk yield per first lactation from –0.472 to –0.486. The average relationship was found between milk yield per first lactation and lifetime productivity from +0.567 to +0.588. Cows of the Altai Territory (3.08 lactations or 61.6 months), the Republic of Mordovia (3.38 lactations or 62.4 months) and the Lipetsk region (3.40 lactations or 65.7 months) were distinguished by low age of culling. While the greatest length of productive life was noted in animals and Bryansk (5.48 lactations or 86.9 months) and Irkutsk regions (4.57 lactations or 77.1 months). Bryansk (23 630 kg of milk), Tyumen (18 156 kg) and Irkutsk (17 751 kg) regions occupied the leading positions in lifetime productivity of cows in the sample, while the outsiders were the regions of traditional cattle breeding - Altai Territory (12658 kg of milk), the Republic of Bashkiria (12 482 kg). Scientific novelty. For the population Simmental cattle of the Russian Federation, for the first time, an assessment of selection and genetic parameters of lifelong productivity and length of productive life of Simmental cows was carried out, depending on the breeding region.

scholarly journals VALUASI EKONOMI OBJEK WISATA HUTAN MANGROVE MUNJANG DI DESA KURAU BARAT KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 14 (1) ◽  
pp. 101
Author(s):  
Soleha Soleha ◽  
Yudi Sapta Pranoto ◽  
Evahelda Evahelda
Keyword(s):  
Pearson Correlation ◽  
Economic Value ◽  
Negative Relationship ◽  
Strong Relationship ◽  
Survey Method ◽  
Carbon Dioxide Absorption ◽  
Tourist Attractions ◽  
Travel Costs ◽  
The Cost

This study aims to calculate economic value based on travel costs and environmental services of Mangrove Munjang Forest attractions. This research was conducted in the supporting Mangrove Munjang Forest in Kurau Barat Village, Koba Subdistrict, Central Bangka Regency starting in November 2018 until June 2019. The research method used was the survey method. The sampling method using simple accidental sampling for the determination of 100 respondents obtained using the Rao Purba formula, and the method of analysing travel costs using Pearson Correlation analysis. The results of the study showed that the overall economic value of Mangrove Munjang Forests was Rp28.292.560.968 per year that is the flora value of Rp15.037.827.000, fauna value Rp7.286.730.000, carbon dioxide absorption value is Rp4.261.243.068 and the value of travel cost is Rp1.706.760.900. The correlation between the cost of travel and the number of visits showed a strong relationship namely -,540 with the direction of a negative relationship namely the higher the cost of travel incurred by visitors, the lower the visitor’s desire to travel o tourist attractions and vice versa.

scholarly journals Density-dependent changes in effective area occupied for sea-bottom-associated marine fishes

2016 ◽  
Vol 283 (1840) ◽  
pp. 20161853 ◽  
Author(s):  
James T. Thorson ◽  
Anna Rindorf ◽  
Jin Gao ◽  
Dana H. Hanselman ◽  
Henning Winker
Keyword(s):  
Ideal Free Distribution ◽  
Spatial Dynamics ◽  
Negative Relationship ◽  
Strong Relationship ◽  
Effective Area ◽  
Marine Fishes ◽  
Population Declines ◽  
Density Dependent ◽  
Sea Bottom ◽  
Mixed Support

The spatial distribution of marine fishes can change for many reasons, including density-dependent distributional shifts. Previous studies show mixed support for either the proportional-density model (PDM; no relationship between abundance and area occupied, supported by ideal-free distribution theory) or the basin model (BM; positive abundance–area relationship, supported by density-dependent habitat selection theory). The BM implies that fishes move towards preferred habitat as the population declines. We estimate the average relationship using bottom trawl data for 92 fish species from six marine regions, to determine whether the BM or PDM provides a better description for sea-bottom-associated fishes. We fit a spatio-temporal model and estimate changes in effective area occupied and abundance, and combine results to estimate the average abundance–area relationship as well as variability among taxa and regions. The average relationship is weak but significant (0.6% increase in area for a 10% increase in abundance), whereas only a small proportion of species–region combinations show a negative relationship (i.e. shrinking area when abundance increases). Approximately one-third of combinations (34.6%) are predicted to increase in area more than 1% for every 10% increase in abundance. We therefore infer that population density generally changes faster than effective area occupied during abundance changes. Gadiformes have the strongest estimated relationship (average 1.0% area increase for every 10% abundance increase) followed by Pleuronectiformes and Scorpaeniformes, and the Eastern Bering Sea shows a strong relationship between abundance and area occupied relative to other regions. We conclude that the BM explains a small but important portion of spatial dynamics for sea-bottom-associated fishes, and that many individual populations merit cautious management during population declines, because a compressed range may increase the efficiency of harvest.

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