The reproductive period is a critical part of species’ life history. Estimating species-specific fecundity can improve demographic models aimed at developing recovery targets for imperilled species. We provide egg diameter and estimates develop length–fecundity relationship silver shiner, Notropis photogenis (Cope, 1865), small-bodied freshwater species listed as Threatened under Canada's Speci...

Reproductive data of 1910 Thoroughbred mares from seven Polish studs were analyzed using linear animal model. The mares were born between 1929 and 1994. The frequency of multiple pregnancies was 3.5% in this population. Fecundity (defined as ratio of number of progeny to number of pregnancies) and length of reproduction were recorded. Heritability estimates of fecundity and the number of pregna...

Aim: To detect the induction of morphological and populational alterations on Ceriodaphnia cornuta concerning cyclomorphosis and population dynamic parameters as densities, fecundity rates, juveniles percentage, males presence and ephippia presence in the presence of predators; Methods: Two experiments were performed: Experiments with fishes fed on Ceriodaphnia cornuta – Experiment 1 – and “Fis...

Female age influence on mating success, courtship activities, mating latency, copulation duration, fecundity, ovarioles number, and wing length has been studied using isofemale lines of Drosophila bipectinata collected at three different localities. It was observed that in all localities, middle-aged D. bipectinata females had significantly greater mating success, showed less rejection response...

The reproductive season of tilapia was studied by monthly samplings at Emiliano Zapata dam, Morelos State, Mexico. From February 1999 through February 2000 a sample of 50 fish was taken from the commercial catch (castnet, 6.5 cm of mesh size). The observed sex ratio was 1:1.29 (females:males) (chi(2)=10.26; p<0.05). The tilapia reached maturity at 151.3 mm (females) and 152.0 mm (males) of tota...

The present study aimed to investigate the reproductive biology of Labeobarbus altianalis from River Kuja-Migori basin, Kenya. This fish species is distributed in most water bodies Lake Victoria basin and effluent rivers. susceptible fishing due aggregation at river mouths during reproduction seasons. We conducted a for 18 months with an objective determining length 50% sexual maturity, fecundi...

The tautog, Tautoga onitis (Linnaeus), ranges from Nova Scotia to South Carolina and has become a popular target for recreational and com­ mercial fisheries. Although tautog are a multiple spawning species, reproductive potential, measured as annual fecun­ dity, has not been estimated previously with methods (batch fecundity, spawn­ ing frequency) necessary for a species with indeterminate annu...

In the literature, various environmental factors are described as being capable of influencing the reproductive output of insect females irrespective of their body size. Still, female body size or weight is widely used as a proxy for fecundity. In the present study, a seven-year data set on the autumnal moth, Epirrita autumnata (Borkhausen) (Lepidoptera: Geometridae), was used to analyze whethe...

Maurolicus muelleri is a significant component of the marine ecosystem and has potential to be valuable fishery resource. However, in Bay Biscay, its primary biological traits remain unclear. This study presents data on length distribution, age, growth, maturity ogive, spawning season, batch fecundity, sex ratio for captured Biscay. The results showed that spring, adult spawners (ages 1 2) were...