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.

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.

Front Individuals Lead in Shoals of Three-Spined Sticklebacks (Gasterosteus Aculeatus) and Juvenile Roach (Rutilus Rutilus)

Behaviour ◽  
1993 ◽  
Vol 125 (3-4) ◽  
pp. 189-198 ◽  
Author(s):  
Dirk Bumann ◽  
Jens Krause
Keyword(s):  
Gasterosteus Aculeatus ◽  
Rutilus Rutilus ◽  
Swimming Velocity ◽  
Front Part ◽  
Roach Rutilus Rutilus ◽  
Video Recordings ◽  
New Directions ◽  
Short Time ◽  
Juvenile Roach ◽  
Dominant Influence

AbstractFish shoals are usually seen as anonymous leaderless groups in which all individuals have the same influence on swimming velocity and direction. This hypothesis was tested by investigating swimming directions of shoals of roach (Rutilus rutilus) and three-spined stickleback (Gasterosteus aculeatus). In roach, the influence of front and rear fish on the shoal's swimming direction was compared by analysing video recordings. Front fish initiated new directions significantly more often and were followed by rear fish. In a second experiment two shoals of sticklebacks were released from two channels which were positioned at an angle relative to each other. The shoals usually appeared with a short time difference at the opening of the channels and then merged. Initially the two shoals faced in different directions based on the orientation of their respective channel and it was recorded which direction prevailed after the shoals had merged. The shoal that left the channel first, and therefore formed the front part of the merged shoal, clearly dominated the direction. Thus, both experiments gave evidence for front fish having a dominant influence on the direction of the shoal. In the context of sustained position preferences of individual fish, recently observed in roach, this suggests that fish shoals may have leaders over extended time periods.

Growth Rates and Growth Efficiencies in Larvae and Juveniles of Rutilus rutilus and Other Cyprinid Species: Effects of Temperature and Food in the Laboratory and in the Field

1988 ◽  
Vol 45 (6) ◽  
pp. 943-950 ◽  
Author(s):  
W. Wieser ◽  
H. Forstner ◽  
F. Schiemer ◽  
W. Mark
Keyword(s):  
Growth Rates ◽  
Cold Water ◽  
Juvenile Fish ◽  
Larval Growth ◽  
Rutilus Rutilus ◽  
Growth Efficiency ◽  
Gut Contents ◽  
Sudden Increase ◽  
Roach Rutilus Rutilus ◽  
Relative Growth Rates

Growth rates were determined in four 0+ class populations of roach (Rutilus rutilus): two from warm backwaters of the Danube and two from cold-water lakes. Larval growth was also determined in the laboratory for R. rutilus, Leuciscus cephalus, and Alburnus alburnus at 15, 20, and 25 °C. Q10 values of growth rates were low (1.29–1.67) between 20 and 25 °C but were high (3.9) between 15 and 20 °C. Net growth efficiency of the larvae of R. rutilus ranged from 68.6 to 71.9% at 15 °C and from 72.3 to 73.5% at 20 °C. A comparison of temperature-corrected relative growth rates in the four populations of roach revealed significant differences between the two warmwater and the two cold-water populations. Growth of warmwater populations was fastest right after hatching and then declined in a fairly regular way. Growth of cold-water populations was slow after hatching but increased later. These differences reflect interactions between temperature and food availability in the two types of water bodies. The sudden increase in growth rate in the population from the coldest lake can be correlated with a change in gut contents which in turn reflects the improved ability of the juvenile fish for catching Zooplankton.

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.

scholarly journals Littoral 0+ fish assemblages in three reservoirs of the Nové Mlýny dam (Czech Republic)

2011 ◽  
Vol 49 (No. 10) ◽  
pp. 450-457 ◽  
Author(s):  
P. Jurajda ◽  
J. Regenda
Keyword(s):  
Czech Republic ◽  
Fish Assemblages ◽  
Juvenile Fish ◽  
Rutilus Rutilus ◽  
Common Species ◽  
Roach Rutilus Rutilus ◽  
Sandy Gravel ◽  
Fish Samples ◽  
Lowland Reservoirs ◽  
Leuciscus Idus

A synchronous study of 0+ juvenile fish in three lowland reservoirs (Mušov, Věstonice, Nové Mlýny) of the Nové Mlýny dam (Czech Republic) was conducted in July 1997. Fish were sampled by fry beach seine and backpack electro fishing gear at 32 sites in three types of inshore habitats: concrete stepped embankment, stony rip-rap and sandy-gravel beach. In total, we registered 0+ juvenile fish of 17 species and one hybrid. The most common species was bleak Alburnus alburnus (62.7%), followed by roach Rutilus rutilus (12.8%), ide Leuciscus idus (6.2%) and asp Aspius aspius (5.5%). More than 53% of 0+ fish samples were caught in beach sites, 43% in rip-rap sites and only 3.4% in concrete embankment. The littoral assemblages of 0+ fish differed between the three adjacent reservoirs and also between the shoreline types.  

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