Age, growth, condition and reproduction of roach Rutilus rutilus (Teleostei : Cyprinidae), in south-eastern Australia

2014 ◽  
Vol 65 (3) ◽  
pp. 275 ◽  
Author(s):  
Daniel J. Stoessel
Keyword(s):  
Life History ◽  
Growth Condition ◽  
Environmental Conditions ◽  
Sexual Maturity ◽  
Rutilus Rutilus ◽  
Ecological Knowledge ◽  
Population Differences ◽  
Roach Rutilus Rutilus ◽  
Eastern Australia ◽  
Mean Size

The roach, Rutilus rutilus, endemic to large portions of Europe, was introduced to Australia in 1861. Because of a lack of ecological knowledge of populations in Australia, life-history aspects of specimens collected in 2000 and 2001 from Lake Eildon were investigated. Fish ranged in length (LF) from 83 to 240 mm, in weight from 63 to 187 g and in age from 1.1 to 8.6 years. Parameters of growth for male R. rutilus were L∞ = 209 and t0 = –2.2 (n = 62), for female R. rutilus L∞ = 211 and t0 = –0.8 (n = 147), and for all aged individuals L∞ = 203 and t0 = –1.6 (n = 380). Mean size and age at sexual maturity (Lm50) was 161 mm and 3.6 years for males and 156 mm and 3.3 years for females. Latitudinal variation in environmental conditions, especially temperature, is suggested to be largely responsible for inter-population differences of growth and condition described in the present study.

Spawning migrations, sexual maturity and sex steroid levels in female roach Rutilus rutilus from the River Meuse

1999 ◽  
Vol 61 (2) ◽  
pp. 111-121
Author(s):  
Patrick Kestemont ◽  
Jacques Rinchard ◽  
Valérie Feys ◽  
Alexis Fostier
Keyword(s):  
Sexual Maturity ◽  
Rutilus Rutilus ◽  
Sex Steroid ◽  
Roach Rutilus Rutilus ◽  
River Meuse

Aspect of the reproductive biology of the Gummy Shark, Mustelus antarcticus Gunther, from waters off the South coast of Western Australia

1990 ◽  
Vol 41 (6) ◽  
pp. 807 ◽  
Author(s):  
RCJ Lenanton ◽  
DI Heald ◽  
M Platell ◽  
M Cliff ◽  
J Shaw
Keyword(s):  
Reproductive Biology ◽  
Western Australia ◽  
Seasonal Changes ◽  
Sexual Maturity ◽  
Post Partum ◽  
Target Species ◽  
Eastern Australia ◽  
Mean Size ◽  
The Mean ◽  
Major Target

The gummy shark (Mustelus antarcticus) is a major target species in two substantial shark fisheries that operate in temperate Australian waters. Data on the reproductive biology of M. antarcticus in the waters off south-western Australia were obtained from samples collected by commercial vessels operating from Albany to Esperance, Western Australia. The samples contained a ratio of four females to one male. M. antarcticus is a viviparous, aplacental species. Males mature at a smaller size than females. Since the overwhelming majority of sharks sampled were mature, it was not possible to estimate precisely the mean size at which sexual maturity was attained. Examination of seasonal changes in the development of ova and testes, in uterine contents, and in embryo growth established that the period of parturition, mating and ovulation occurred over the 3 months between early November and early February. The gestation period was 11-12 months. Full-term embryos ranged in size from 30 to 36 cm total length and occurred in a sex ratio of one male to one female. The ovarian and gestational cycles proceed concurrently, with reproduction occurring annually. Only one of the 224 females analysed for uterine content was considered to be in a true post-partum condition. The number of embryos (N) per mother increased with the length of the mother (L) according to the regression N = exp(-4.13398 + 0.049171L). The reproductive biology of females collected off Albany and Esperance differed in some respects from that of females collected off south-eastern Australia.

Factors Affecting the Shift in Predominance from Eurasian Perch (Perca fluviatilis) to Roach (Rutilus rutilus) in the Kličava Reservoir, Czechoslovakia

1977 ◽  
Vol 34 (10) ◽  
pp. 1571-1575 ◽  
Author(s):  
K. Pivnička ◽  
M. Švátora
Keyword(s):  
Growth Rate ◽  
Sex Ratio ◽  
Environmental Conditions ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Roach Rutilus Rutilus ◽  
Eurasian Perch ◽  
Factors Affecting ◽  
Perch Perca Fluviatilis ◽  
Marked Decline

A shift in predominance from Eurasian perch (Perca fluviatilis) to roach (Rutilus rutilus) in the Kličava Reservoir in 1964, 10 yr after filling, was attributed mainly to a marked decline in the ratio of female to male perch spawners. The ratio was about 1:4 for perch and unity for roach. Fecundity of perch was about 25% that of roach which, together with the decline in spawning females, probably contributed to smaller year-classes. The decline in growth rate of perch in response to increasing abundance was greater than that for roach. Under equal environmental conditions, roach is also more productive than perch. Key words: Percidae, Perca, Rutilus, Kličava Reservoir, Czechoslovakia, shift in predominance, fecundity, sex ratio, methodology, growth–abundance relationships

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