scholarly journals THE INFLUENCE OF THE HIGH CONTENT OF Cа2+, Mg2+ AND Nа+ ON VARIABILITY OF THE PORES NUMBER IN LATERAL LINE CRANIAL CANALS OF ROACH FINGERLINGS

2020 ◽  
pp. 128-135
Author(s):  
B. G. Kotegov ◽  
Keyword(s):  
Lateral Line ◽  
Rutilus Rutilus ◽  
Individual Development ◽  
Control Group ◽  
Roach Rutilus Rutilus ◽  
Seismosensory System ◽  
Spawning Period ◽  
Aquarium Experiment ◽  
Calcium Magnesium ◽  
Chloride Salts

In a five-month aquarium experiment, roach Rutilus rutilus (Linnaeus, 1758) fingerlings were grown under different hydrochemical conditions. Roach eggs were collected during the spawning period in the shallow coastal waters of a small isolated and unpolluted pond and placed in laboratory for subsequent incubation. Hatched early larvae after switching to exogenous nutrition were divided into four groups for further development in control hydrochemical condition and in the water with a total mineralization increased twice relative to the control due to the addition of calcium, magnesium or sodium chloride salts. At the end of the experiment, roach fingerlings grown in the three groups in conditions of increased water mineralization differed statistically significantly from their coevals in the control group by a smaller average number of pores in the lateral line canals located on some paired dermal bones of the head. Also, these three groups of roach in comparison with the control group were characterized by an increase in the dispersion of the fluctuating asymmetry of the total values of the studied bilateral counting features. The obtained results are explained in the light of the possible influence of the above biologically significant cations on the morphogenesis of the cranial seismosensory system during the early individual development of fishes.

scholarly journals Selective and Reversible Blocking of the Lateral Line in Freshwater Fish

1987 ◽  
Vol 133 (1) ◽  
pp. 249-262 ◽  
Author(s):  
HANS ERIK KARLSEN ◽  
OLAV SAND
Keyword(s):  
Inner Ear ◽  
Lateral Line ◽  
Near Field ◽  
Low Frequency ◽  
Rutilus Rutilus ◽  
Directional Hearing ◽  
Roach Rutilus Rutilus ◽  
Cobalt Ions ◽  
Lateral Line Nerve ◽  
Pharmacological Method

Fish possess two separate systems for detection of low-level sound and water motions in the low-frequency range: the inner ear and the lateral line. The relative roles of these systems in normal fish behaviour is still not clear. There is, for instance, a lack of experimental evidence showing the involvement of the lateral line and the inner ear in detection of infrasound, in directional hearing in the near field, and in detection and attack of swimming prey below the surface. To provide a useful tool for such studies, we have developed a pharmacological method for selective and reversible blocking of the lateral line in the roach (Rutilus rutilus). By recording multi-unit activity from the lateral line nerve and microphonic potentials from the inner ear, we have shown that cobalt ions in the external water may completely block the mechanosensitivity of the lateral line without affecting the utricular microphonic activity. This inhibiting effect of Co2+ is antagonized by Ca2+, making the ratio between these ions the important blocking factor. For practical work, we recommend 12–24h exposure to 0.1 mmol 1−1 Co2+ at a Ca2+ concentration of less than 0.1 mmol 1−1. The fish showed no sign of general behavioural disorders even after 1 week in this solution, and the microphonic sensitivity of the inner ear was not reduced. The blocking effect of Co2+ was clearly reversible, and the recovery was dependent upon both the duration of the Co2+ exposure and the Ca2+ concentration of the recovery solution.

Fecundity of Two Cyprinid Fishes in the River Thames, Reading, England

1969 ◽  
Vol 26 (11) ◽  
pp. 2795-2805 ◽  
Author(s):  
I. Mackay ◽  
K. H. Mann
Keyword(s):  
Population Density ◽  
Egg Production ◽  
Rutilus Rutilus ◽  
Confidence Limits ◽  
Roach Rutilus Rutilus ◽  
Spawning Period ◽  
Cyprinid Fishes ◽  
River Thames ◽  
The Relationship ◽  
Bleak Alburnus Alburnus

Egg production by two cyprinids in the River Thames at Reading, England, was studied quantitatively from January to June 1966. Roach (Rutilus rutilus) had a short spawning period, shedding all their eggs in one batch, whereas bleak (Alburnus alburnus) had a protracted spawning period and produced two or three batches of eggs. The relationship between egg numbers (Y) and age (X) for roach was given by log Y = 0.0840X + 3.2085; the estimated fecundity of a 6-year-old fish was 5157 with 95% confidence limits at 4725 and 5631. For bleak the relationship was log Y = 0.0564X + 3.5221, and the estimated fecundity of a 5-year-old fish was 6356 with 95% confidence limits at 5987 and 6776. Combining previously obtained data on population density with new data on sex ratio and percentage breeding in each age class, the population fecundity for roach was about 600 eggs/m2 and for bleak about 3000 eggs/m2.The roach population had lower fecundity than roach populations in other studies and there was some evidence that a proportion of females ceased egg production during the period of the study. The possibility that low fecundity was a response to food shortage is discussed.

Breeding Tubercles, Papillomatosis and Dominance Behaviour of Male Roach (Rutilus rutilus) During the Spawning Period

Ethology ◽  
2004 ◽  
Vol 110 (8) ◽  
pp. 591-601 ◽  
Author(s):  
Raine Kortet ◽  
Jouni Taskinen ◽  
Anssi Vainikka ◽  
Hannu Ylonen
Keyword(s):  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Spawning Period ◽  
Dominance Behaviour

scholarly journals Restoration of a river backwater and its influence on fish assemblage

2011 ◽  
Vol 50 (No. 10) ◽  
pp. 473-482 ◽  
Author(s):  
E. Hohausová ◽  
P. Jurajda
Keyword(s):  
Fish Assemblage ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Spawning Period ◽  
Spawning Site ◽  
Perch Perca Fluviatilis ◽  
Current Value ◽  
Morava River ◽  
Habitat Development

The development of fish assemblage in a restored river backwater (Kurfürst backwater, Morava River, Czech   Republic) was monitored over a six-year period from its restoration. The structure of fish assemblage remained similar throughout the years. Species richness of adult fish increased from twelve species during the restoration to 20 after it. Initially steady fish abundance (mean 52.3–98.1 inds/ha) and biomass (mean 5.8–7.6 kg/ha) increased significantly in 1999 five years after restoration (576.9 inds/ha and 23.3 kg/ha, respectively). The main resident species were pike Esox lucius, roach Rutilus rutilus, rudd Scardinius erythrophthalmus and perch Perca fluviatilis. High abundance of bleak Alburnus alburnus and chub Leuciscus cephalus was related to their spring spawning period. The structure of the 0+ fish assemblage was similar throughout the years, with chub and bleak prevailing during the restoration, and roach, chub and rudd after it. The number of 0+ species increased from seven to 17. The monitoring documented that the restoration could be considered as beneficial for the fish assemblage. Habitat development of the backwater is likely to influence its current value as a refuge, spawning site and nursery for local fish populations.  

scholarly journals Biochemical and hematological parameters of the roach Rutilus rutilus heckelii (Nordmann, 1840) from the Sea of Azov stock in the spring season of 2020–2021

2021 ◽  
Vol 937 (2) ◽  
pp. 022065
Author(s):  
V Lisovskaya ◽  
A Voykina ◽  
S Sergeeva ◽  
O Kirichenko ◽  
L Bugaev
Keyword(s):  
Hematological Parameters ◽  
Physiological State ◽  
Rutilus Rutilus ◽  
Average Concentration ◽  
Gonad Maturation ◽  
Sea Of Azov ◽  
Spring Season ◽  
Roach Rutilus Rutilus ◽  
Spawning Period ◽  
The Sea Of Azov

Abstract This work presents the results of the investigation of the physiological state of the roach Rutilus rutilus heckelii breeders from the Sea of Azov stock during the spawning period. It has been established that, in the spring season of 2020 and 2021, the content of proteins and lipids in fish tissues, as well as hematological parameters in all investigated roach specimens from different water bodies were consistent with the average long-term values. The content of proteins in the muscles and liver of roach does not differ by sex. A higher protein content in the gonads of females is characteristic of the pre-spawning period due to the process of gonad maturation. The high content of lipids in the gonads of males apparently results from the lower energy consumption for maturation of the gonads and spawning. The average concentration of sodium and potassium ions decreased in comparison with the values obtained in 2020, while the concentration of chloride anions increased. It has been concluded that the physiological state of all investigated roach specimens was normal.

Population Characteristics and Feeding of Roach Rutilus rutilus in Small Regulated River of the Kyiv Polissya

2020 ◽  
Vol 56 (1) ◽  
pp. 42-48
Author(s):  
Ye. A. Gupalo ◽  
I. I. Abramyuk ◽  
S. A. Afanasyev ◽  
O. V. Manturova ◽  
Ye. V. Savchenko
Keyword(s):  
Rutilus Rutilus ◽  
Population Characteristics ◽  
Regulated River ◽  
Roach Rutilus Rutilus
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