Erratum: Size at onset of sexual maturity and growth rate in crustacean populations

1975 ◽  
Vol 53 (3) ◽  
pp. 360-360
Author(s):  
Adrian M. Wenner ◽  
Craig Fusaro ◽  
Allan Oaten
Keyword(s):  
Growth Rate ◽  
Sexual Maturity

Adptatives Responses of the Species Ethmalosa fimbriata in Biétri Bay, a Highly Disturbed Environment

2021 ◽  
Vol 12 (1) ◽  
pp. 48
Author(s):  
Moussa Side ◽  
Eby Yoboué Gnamma Honorine Alla ◽  
Behiri Innocent Kakou ◽  
Béatrice Abouo Adepo-Gourene
Keyword(s):  
Growth Rate ◽  
Sexual Maturity ◽  
Reference Site ◽  
Growth Parameters ◽  
The Other ◽  
Other Hand ◽  
Males And Females ◽  
Disturbed Environment

The growth and size at first sexual maturity of the species Ethmalosa fimbriata were studied in two sites in the Ebrié lagoon: Bietri, a highly anthropized environment and Vitré 2, a reference site. Growth parameters estimated from size frequencies showed that growth in both size and weight was faster in females than in males regardless of habitat. On the other hand, specimens from Biétri bay have a slower growth rate than those from Vitré 2. In Bietri bay, individuals are characterized by early sexual maturity. They reach sexual maturity at the age of 0.55 years (about 7 months), corresponding to a size of 6.13 cm for males and 8.42 cm for females; whereas in Vitré 2, they reach sexual maturity at the age of 0.82 years (about 10 months) corresponding to a size of 10.22 cm and 12.94 cm for males and females respectively. These results show that in a highly antropic environment, the growth of Ethmalosa fimbriata is affected and individuals reproduce earlier.

The effect of fin-clipping on growth rate, survival and sexual maturity of rainbow trout

Aquaculture ◽  
1988 ◽  
Vol 73 (1-4) ◽  
pp. 383-389 ◽  
Author(s):  
Bjarne Gjerde ◽  
Terje Refstie
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Sexual Maturity

Observations on the tissue and post-tissue larval development of Ascaridia dissimilis Vigeuras 1931, and a comparison with that of Ascaridia galli, in turkeys

Parasitology ◽  
1968 ◽  
Vol 58 (3) ◽  
pp. 709-714
Author(s):  
C. Horton-Smith ◽  
P. L. Long ◽  
D. L. Lee
Keyword(s):  
Growth Rate ◽  
Larval Development ◽  
Sexual Differentiation ◽  
Sexual Maturity ◽  
Room Temperature ◽  
Technical Assistance ◽  
Ascaridia Galli ◽  
Tissue Phase

A tissue phase of the nematode A. dissimilis has been demonstrated. The larvae enter the tissue soon after hatching and not, as previously thought, after 7 days.The growth rate of A. dissimilis in young poults has been studied. Sexual differentiation can be observed from the 14th day and sexual maturity occurs as early as 28 days after infection.From the recorded figures it is evident that A. dissimilis is not necessarily a smaller species than A. galli. The age of the host influences the development of maturity of the worms and probably the size of the nematodes as well. The largest female recorded here was 128 mm and the largest male was 77 mm when removed from a turkey 76 days after infection.The infectivity of A. dissimilis ova is not impaired after storage at room temperature in 1 % formalin for up to 237 days. Embryonation is complete in 9–10 days at 30 °C.It has been shown that chickens are probably refractory to A. dissimilis.We wish to acknowledge the technical assistance of Mr J. Brownbill, Mrs B. Fisher and Mr P. R. Mills.

scholarly journals Patterns of temporal variation in growth rate from a mainland population of Anolis nebulosus (Squamata: Dactyloidae), in the Mexican Pacific Coast

2017 ◽  
Author(s):  
Aurelio Ramírez Bautista ◽  
Uriel Hernández-Salinas ◽  
Raciel Cruz Elizalde
Keyword(s):  
Growth Rate ◽  
Food Availability ◽  
Sexual Maturity ◽  
Pacific Coast ◽  
Growth Patterns ◽  
Dry Forest ◽  
Minimum Size ◽  
Von Bertalanffy ◽  
Mexican Pacific ◽  
Size At Sexual Maturity

In this study we used three nonlinear regression models: Von Bertalanffy, logistic-by-length, and logistic-by-weight to describe the pattern of growth of hatchling, juvenile, and adult of the lizard Anolis nebulosus in a tropical dry forest near of the Mexican Pacific coast during a period of 1989 and 1990. Von Bertalanffy and logistic-by-length models showed the best fit to the growth data for males and females of three age classes from marked and recaptured lizards in these years. The characteristic parameter of growth (r) and asymptotic growth (A1) extracted from these models indicated that males grow faster than females, but the latter reach a slightly larger size than males. The growth curves revealed that males reach minimum size at sexual maturity at 35 mm in snout-vent length (SVL), at an age of seven months, while females reach sexual maturity at 37 mm of SVL at nine months. Comparisons of growth rate between wet and dry seasons and years revealed that hatchlings and juveniles of both sexes had higher growth during the wet season for both years. Although there was no significant variation between measured environmental variables or in the food availability, the weight of evidence suggests that environmental variation has an influence on the growth of A. nebulosus of this population. Results indicate that variation on growth patterns observed may result from a combination of environmental factors, such as food availability, predation pressure and some reproductive characteristics as size at sexual maturity and size of hatchlings at birth.

Clyde Nephrops: biology and fisheries

1986 ◽  
Vol 90 ◽  
pp. 501-518 ◽  
Author(s):  
N. Bailey ◽  
F. G. Howard ◽  
C. J. Chapman
Keyword(s):  
Growth Rate ◽  
Physical Environment ◽  
Sexual Maturity ◽  
Size Composition ◽  
Fishing Effort ◽  
Ovary Development ◽  
Organic Carbon Content ◽  
The North ◽  
Clyde Sea ◽  
Sea Area

SynopsisThe fishery for Norway lobsters Nephrops norvegicus began in the 1950s and has since become one of the most valuable assets of the Clyde Sea Area. Landings of Nephrops reached a peak of 26001 in 1972. Following a decline in landings up to 1975 there has been a further increase to over 45001 in 1983, valued at £4–5 million. Most of the landings are made by inshore trawlers working from Ayr, Troon, Girvan, Largs, Campbeltown and Tarbert. Recently a small creel fishery has developed in some sea lochs. The abundance of the stock appears to have been maintained; landings per unit of fishing effort have fluctuated without any obvious trend.Since September, 1979. several aspects of the biology of Nephrops have been studied in an area south of the Little Cumbrae at the north end of the east Arran Basin. Data are presented on the density, size composition, growth rate, reproductive biology and feeding of Nephrops in this area. The results are compared with those obtained for other Nephrops populations, revealing some unusual features of Clyde Nephrops. In the Clyde, densities were lower than in a number of other areas, while growth rate was much higher and animals grew to larger sizes. Sexual maturity was attained at a larger size in Clyde Nephrops and studies of ovary development revealed that considerable numbers of large females did not reproduce annually, in contrast to some other areas. Recent observations suggest that the biological characteristics of Nephrops populations in an area may be influenced by features of the local physical environment such as the particle size distribution and organic carbon content of the sediment. Differences between Clyde Nephrops and those from other areas are discussed in relation to this.

High protein wheats for poultry. 2. Use in diets for replacement stock

1971 ◽  
Vol 11 (53) ◽  
pp. 624 ◽  
Author(s):  
W Turner ◽  
CG Payne
Keyword(s):  
Growth Rate ◽  
Sexual Maturity ◽  
Egg Production ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
High Protein ◽  
Lysine Content ◽  
Growing Period ◽  
Main Component ◽  
Grower Diet

The use of high protein wheat as the main component of a grower diet for laying strain pullets from seven weeks of age to point-of-lap was investigated. This diet was shown to have an inadequate lysine content for maximum growth rate, and was probably also deficient in arginine. Birds receiving this diet were restricted in their growth rate, and consequently their sexual maturity was delayed. Subsequent egg production was increased sufficiently to offset this delay, and an advantage of this diet was found to be a reduced food intake during the growing period

scholarly journals Growth-related life-history traits of an invasive gammarid species: evaluation with a Laird–Gompertz model

2003 ◽  
Vol 81 (12) ◽  
pp. 2006-2014 ◽  
Author(s):  
Christophe Piscart ◽  
Simon Devin ◽  
Jean-Nicolas Beisel ◽  
Jean-Claude Moreteau
Keyword(s):  
Growth Rate ◽  
Growth Curve ◽  
Environmental Conditions ◽  
Sexual Maturity ◽  
Growth Models ◽  
Gompertz Model ◽  
Biological Traits ◽  
Freshwater Species ◽  
Dikerogammarus Villosus ◽  
Forcing Function

Although the invasive gammarid Dikerogammarus villosus (Crustacea, Amphipoda) is a recent successful invader of Western Europe's lakes and rivers and a threat to North American aquatic ecosystems, its biology is scarcely known. Different growth models for each sex were established for the first time for a natural population of a freshwater gammarid. The Laird–Gompertz growth curve was used because it best fit our data, and it was associated with an environmental forcing function to adjust the growth rate according to seasonal variations in environmental conditions. The growth curve was applied to a length decomposition obtained using the Bhattacharya method, realised on data obtained from a 1-year population dynamics study. The models allowed an assessment of biological traits such as life-span, the age of sexual maturity, the potential number of generations per year, and the growth rate as a function of environmental conditions. Differences in growth rate between males and females were consistent with biological processes such as allocation of energy for reproduction. Dikerogammarus villosus had higher rates of growth and earlier sexual maturity than all other taxa studied, which may explain its invasive tendencies and its ability to colonize numerous new ecosystems, thus becoming a cosmopolitan freshwater species.

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