Mantis shrimps (Crustacea: Stomatopoda) are potential aquaculture species as they are constantly fished from the wild to satisfy demands of the seafood industry. Breeding capacity of mantis shrimps in captivity is scarce and implies a gap in this area to achieve successful aquaculture practices for this species. A preliminary observation was conducted with locally obtained mantis shrimps Miyake...

Two experiments were conducted with golden Hubbard pullet chicks to investigate the replacement effects of locally prepared fish silage for imported meal in and layers' rations. Acidic neutral preparations concentrated either maize or cassava plus groundnut wheat offals, fed as a substitute meal. Results pullets showed good feed consumption all dietary treatments but efficiency was decreased (P...

Expansion and shoaling of the Oxygen Minimum Zone (OMZ) in coastal upwelling systems due to climate change can have dire consequences on ecosystem structure productivity. The OMZ restricts habitat range most zooplankton, species with low tolerance hypoxia may suffer physiological stress mortality as a result. During 2013 2014, copepod Acartia tonsa collected off northern Chile was used evaluate...

Oils are some of the most efficient and secure alternatives to synthetic fungicides, acaricides insecticides used as pesticides for decades. Around world, mineral oils a potential pesticide against many pests. To provide novel active ingredients new formulations industry, major goal this research was formulate one petroleum fractions test its acaricidal efficiency two-spotted spider mite (TSSM)...

White Leghorn hens were fed diets containing 0, 300, 600, or 1200 ppm technical grade DDT for three 28-day periods. The 1200 ppm diet caused tremors and 33% mortality in the final period, but no gross toxicity symptoms were seen in birds fed the other diets. Egg production was decreased during the third period by 600 or 1200 ppm. Egg weight was decreased during the third period by 600 or 1200 p...

Life-history models for marine invertebrate larvae generally predict a dichotomy in egg size in different species: eggs should be either minimal in size or large enough to support development fully without larval feeding. This prediction is contradicted, however, by the empirical observation of wide, continuous variation in egg size between these extremes. The prediction of dichotomy rests on t...

An equation independently derived by Edmondson and Paloheimo for estimating instantaneous birth rates without a knowledge of mortality rates has been extensively employed by zooplankton ecologists. This expression is exactly true only under the unlikely conditions that the age distribution is stable and that egg mortality is equal to that averaged across the entire population. Here I compare es...

Hatchability is a complex age dependent trait. It comprises of several sub-traits which are susceptible to genetic and environmental factors arising from various sources. This review examines the genetic basis of egg production, fertility and egg quality traits and how these relate with hatchability. We suggest that both sire and dam genetic components are important in overall hatchability most...