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.

Myxobolus species infecting the cartilaginous rays of the gill filaments in cyprinid fishes

2008 ◽  
Vol 53 (4) ◽  
Author(s):  
Kálmán Molnár ◽  
Gábor Cech ◽  
Csaba Székely
Keyword(s):  
18S Rdna ◽  
Rutilus Rutilus ◽  
Molecular Methods ◽  
Roach Rutilus Rutilus ◽  
Myxobolus Species ◽  
Rdna Sequences ◽  
Gill Filaments ◽  
18S Rdna Sequences ◽  
Cyprinid Fishes ◽  
Bleak Alburnus Alburnus

AbstractDuring a survey on myxosporean parasites of cyprinid fishes in Hungary, Myxobolus infections were found in the cartilaginous rays of the gill filaments in roach (Rutilus rutilus) and bleak (Alburnus alburnus). Myxobolus spp. causing the infections were studied by morphological, histological and molecular methods. Small plasmodia surrounded by chondrocytes contained relatively few spores which differed from each other and from the known Myxobolus spp. both in their morphology and 18S rDNA sequences. Both species, described as M. feisti sp. nov. and M. susanlimae sp. nov., are characterised by a specific cartilaginous histotropism.

Prey Detection in Cyprinids during Early Development

1989 ◽  
Vol 46 (6) ◽  
pp. 995-1001 ◽  
Author(s):  
Josef Wanzenböck ◽  
Fritz Schiemer
Keyword(s):  
Visual Acuity ◽  
Juvenile Fish ◽  
Rutilus Rutilus ◽  
Prey Detection ◽  
Roach Rutilus Rutilus ◽  
Fish Size ◽  
Video Recordings ◽  
Prey Location ◽  
Bleak Alburnus Alburnus ◽  
Zooplankton Prey

Larval and juvenile fish of roach (Rutilus rutilus L), bleak (Alburnus alburnus L), and blue bream (Abramis ballerus L.) were investigated weekly to define the ontogenetic development of prey detection capacities. Visual acuity was determined by measuring reactive distances for zooplankton prey for fish from 8 to 50 mm standard length using video recordings. Data of reactive distances, swimming speeds, and the characteristics of the visual field were combined to calculate prey location volumes. Prey location capacity increased exponentially with fish size which implies enormous differences in prey encounter rates among size classes of cyprinids. Distinct differences of prey location capacities occurred between species in the juvenile, planktivorous stages of the three cyprinids coinciding with the trophic differentiation of the adults.

Water temperature influencing dactylogyrid species communities in roach, Rutilus rutilus, in the Czech Republic

2001 ◽  
Vol 75 (4) ◽  
pp. 373-383 ◽  
Author(s):  
A. Šimková ◽  
P. Sasal ◽  
D. Kadlec ◽  
M. Gelnar
Keyword(s):  
Czech Republic ◽  
Water Temperature ◽  
Rare Species ◽  
Interspecific Interactions ◽  
Species Abundance ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Effect Of Water ◽  
Morava River ◽  
The Relationship

Dactylogyrid species (Monogenea) communities were studied in roach, Rutilus rutilus, collected from two localities in the basin of Morava river, Czech Republic, during the period from April to November 1997 and March to September 1998 to determine the effect of water temperature on parasite abundance, species richness and diversity. Dactylogyrid species were found to co-occur on the gills of roach with up to six species found on the same host individual. Nine dactylogyrid species were identified with the abundance of each reaching a very low level. Niche size was considered to increase with species abundance even when water temperature was high. There was a strong effect of water temperature on abundance of the common dactylogyrid species (D. crucifer, D. nanus, D. rutili and D. suecicus) as well as of the rare species D. rarissimus. The temporary occurrence of the rare species was found without any temperature effect. Water temperature did not affect the relationship between abundance and niche size. Niche size increased with abundance, even when the water temperature was high, which suggests that negative interspecific interactions are not important within dactylogyrid communities.

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.

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
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