Experimental studies have shown that hatching rate depends, among other factors, on the main physical characteristics of the eggs. The physical parameters used in our work were egg weight, eggshell thickness, egg sphericity, and yolk per albumen ratio. The relationships of these parameters in the incubation process were modeled by Fuzzy logic. The rules of the Fuzzy modeling were based on the a...

Abstract This investigation aimed to improve the hatchery seed production strategy in terms of chronologies embryonic and larval development as well hatching, growth survival rates, rearing water quality green tiger prawn, Penaeus semisulcatus by integration effects different temperatures (23 °C, 26 29 32 °C) probiotic additives. The best shortest stages were favor °C with probiotic. hatching r...

a two-year laboratory study on the biology (including self-fertilization) of bulinus truncatus, the intermediate host of schistosoma haematobium, s. bovis and paramphistomum microbotrium in iran, has revealed information on the longevity, reproduction, hatchability rate, hatching time during various months of the year, and growth and mortality rates of this snail. it was found that the reproduc...

Chronic Cu toxicity was evaluated in the euryhaline copepod Acartia tonsa. Male and female copepods were exposed (6 d) separately to different combinations of Cu concentration and water salinity (5, 15, and 30 ppt) using different routes of exposure (waterborne, waterborne plus dietborne, and dietborne). After exposure, groups of one male and three female copepods were allowed to reproduce for ...

OBJECTIVE To study the clinical outcomes of single frozen-thawed blastocyst transfer cycles according to the hatching status of frozen-thawed blastocysts. METHODS Frozen-thawed blastocysts were divided into three groups according to their hatching status as follows: less-than-expanded blastocyst (≤EdB), hatching blastocyst (HgB), and hatched blastocyst (HdB). The female age and infertility fa...

Growth, energy content, ingestion and respiration rates and energetic efficiencies were measured in the larvae of two marine fish (Solea senegalensis and Sparus aurata) whose eggs have a similar diameter (approximately 1mm) and energy content (approximately 1J), but whose larvae reach a quite different mass after the first month of life. Experiments were carried out in populations reared under ...

BACKGROUND Vitrification has been shown as one of the most effective methods of cryopreservation for mammalian embryos. However, there is no consensus which stage of embryonic development is the most appropriate for vitrification with subsequent maximal development after thawing. This study was carried out to explore and compare the effect(s) of vitrification on mouse 2-cell, 4-cell, 8-cell, mo...

the life history of enochrus quadripunctatus herbst was studied in the laboratory. the duration of each developmental stage, larval behavior, and preimaginal mortality rate were determined. it takes the insect a total of 43 days from hatching to reach the adult stage, with a high mortality rate in the first stadium. the mortality rate decreases as the beetle passes through the immature stages. ...

This study summarizes optimization of techniques for common carp artificial propagation including improvements of activation solution (AS), the process of insemination, and elimination of egg stickiness. The optimum gamete ratio for good fertilization and hatching rate ranged from 8490 to 23 672 spermatozoa per egg, when dechlorinated tap water was used. Optimal ratio between eggs (weight in g)...