Samia cynthia ricini Boisduval Lepidoptera:Saturniidae is a lepidopteran insect that has gregarious behaviour during their larval stage. This research aimed to determine the minimum population limit of larvae can support survival S. c. by observing development time, fecundity, and hatchability eggs produced adult moths under different densities rearing conditions. The was conducted lifecycle at...

Reports of American shad fecundity identify two important themes regarding egg production in fishes. First, geographic variation occurs and is biologically meaningful. Shad annual fecundity decreases with increasing latitude, but predicted lifetime fecundity does not, because of a counter-gradient of survival probability, all of which can explain the adaptive significance of natal homing. Secon...

This study was carried out during May 2010 – April 2011 in order to determine various biological properties of red mullet occurring in the Eastern Black Sea region. The average length and weight of 1435 specimens were determined as 13.13 cm and 23.14 g, respectively. Weight-length relationship was determined as W = 0.0088 L3.0338. The age distribution of this population ranged between I and VII...

Selection is expected to optimize reproductive investment resulting in characteristic trade-offs among traits such as brood size, offspring size, somatic maintenance, and lifespan; relative patterns of energy allocation to these functions are important in defining life-history strategies. Freshwater mussels are a diverse and imperiled component of aquatic ecosystems, but little is known about t...

the purpose of this project is the investigation of lhrha2 integrated effect with carp pituitary extract (cpe) in three stages injection on sexual indexes (fecundity, fertilization, hatch and larval survival) in artificial propagation of barbusxanthopterus. 20 fish were divided in to 4 treatment and injected interpritoneal as follows 4mgkg-1b.w.of cpe as positive control, 4 µg/kg +4 mgkg-1b.w. ...

effect of five soybean varieties (sahar, jk, bp, williams and l17) on life cycle and fecundity of the beet armyworm, spodoptera exigua (hã¼bner) was evaluated at temperature of 25 â± 1â°c, 60 â± 5% r.h. and a photoperiod of 16: 8 (l: d) h. the preimaginal development period of males and females was longest on l17 (30.17 â± 0.28 and 29.63 â± 0.23 days) and shortest on bp and sahar. the adult lon...

This study investigates the effects of dietary lipid sources on the growth and reproductive performance of Nile tilapia over three consecutive spawnings. Fish were reared using three experimental diets, with the goal of replacing dietary fish oil with palm oil. Three experimental diets and a commercial   trout diet was used as the control. The effect of dietary lipid on the growth performance, ...

This study was carried out during May 2010 – April 2011 in order to determine various biological properties of red mullet occurring in the Eastern Black Sea region. The average length and weight of 1435 specimens were determined as 13.13 cm and 23.14 g, respectively. Weight-length relationship was determined as W = 0.0088 L3.0338. The age distribution of this population ranged between I and VII...

Summary The decreasing trends in fertility rates in many industrialized countries are now so dramatic that they deserve much more scientific attention. Although social and behavioural factors undoubtedly play a major role for these trends, it seems premature, and not based on solid information, to conclude that these trends can be ascribed to social and behavioural changes alone. There is evide...

The fecundity of Liza parsia (Hamilton) was estimated studying 80 gravid females collected from the local markets in Khulna during November 2007 to January 2008. ranged 37,675 (total length 15.5 cm, body weight 39.791 g and ovary 3.532 g) 1,87,442 21.8 118.8 18.421 g). mean calculated be 91269.29±35501.09. 8.657±3.458 while that left right lobes were 4.467±1.823 4.192±1.667 respectively. diamet...