Freshwater fish

A.M. Abdelhamid et al, Egypt, look at the possible effects of feeding Nile tilapia, silver carp, common carp and African catfish with dried treated sewage. Part one focuses on growth performance, feed utilisation and chemical composition.

Growth of hyaline cartilage is achieved either by chondrocyte division interstitial type of growth or by perichondrial cell differentiation of mesenchymal cells to differentiated chondrocytes which deposit successive circumferential layers of cartilage matrix …

The use of blue green algae Spirulina in aquaculture has several potential advantages over the production of fish, writes Nasreen M. Abdulrahman and Hawkar J. Hamad Ameen, University of Sulaimaniya.

Due to nitrate accumulation during nitrification and low water-exchange rates in recirculating aquaculture systems (RAS), nitrate levels can build up. Hendrik Monsees has therefore investigated the effect that exposose to high nitrate concentration has on juve…

Ectoparasites are key agents responsible for causing diseases in farmed fish. The Nile tilapia, in particular, has been shown to be susceptible to infestation by trichodinids and monogeneans, write Santiago Benites de Pdua, Aquivet Sade Aqutica, Roney Nogueira…

In line with the level of investment, changes in concepts with regards to sanitary and health management can ensure stable and efficiency in production. Risk reduction from diseases requires continuous diagnosis of pathogens, adoption of biosecurity measures a…

FISHY was first developed in 1980. It was written in Basic and ran on Radio Shack TRS-80 computers. Lee Fouch (an MSU agricultural economics and computer science graduate) and I wrote the initial version, with heavy assistance by agricultural economics profess…

Nicholas Robinson et al, Nofima, Norway, genotype full-sibling families using an Illumina iSelect array containing SNPs found in transcribed genes, in order to produce a genetic linkage map of the L. rohita genome and simultaneously scan the genome of challeng…

This research report contains a brief look at the current status of catfish feeds and is primarily intended for catfish producers and feed formulators and manufacturers, write Edwin H. Robinson and Menghe H. Li, Delta Research and Extension Center in Stonevill…

During the last three decades, a great attention was paid towards aquaculture as an attempt to fulfill the gap between the increased population and their demands from animal protein, write A.M. Abdelhamid,Al-Mansoura University, Mohamed H. Ahmed and Doaa Kh. K…

Research by A. M. Abdelhamid and Ahmed Ismail Mehrim, Al-Mansoura University and I.A.Radwan and A.F.Abdelhamid, Al-Hamoul Fish Hatchery looks at the possibility of reducing cannibalism among newly hatched catfish (Clarias gariepinus) fry by grading.

Any fish farmer that wants to record a high survival of fishand better growth in record time in their ponds must endeavour to paygood attention to pond water quality, writes Lanre Ogunsina.

Two genetically improved tilapia strains (GIFT and Akosombo) have been created with Oreochromis niloticus (Nile tilapia), which is native to Africa. In particular, GIFT has been shown to be significantly superior to local African tilapia strains in terms of gr…

This study by Ahmed Mohamed Nasr-Allah et al was carried out in order to understand the technical and economic characteristics of different Egyptian Nile tilapia (Oreochromis niloticus) hatchery systems. Hatchery operators at fifty tilapia hatcheries in four g…

Many farmers have been unable to successfully breed African Catfish. Several attempts made have given unfruitful results. In this guide, Lanre Ogunsina lists his own simple 19 proven steps to efficiently breed the African Catfish.

This study by Ahmed Mohamed Nasr-Allah et al, WorldFish, Egypt, was carried out in order to understand the technical and economic characteristics of different Egyptian Nile tilapia (Oreochromis niloticus) hatchery systems.

This study by A. M. Abdelhamid et al, Al-Mansourah University, Egypt, aimed to investigate the effect of dietary graded levels of three pre-and probiotics on the immunity and haematology of all-males mono-sex Nile tilapia fish.

Fish depend on dietary fatty acids (FA) to support their physiological condition and health. Exploring the FA distribution in common carp (Cyprinus carpio), one of the world's most consumed freshwater fish, is important to understand how and where FA of differ…

A series of experiments showed that fishmeal is not an essential ingredient in tilapia feeds and that plant protein-based diets can yield results similar to those obtained with diets containing 10 per cent fishmeal, write Nathan Gur and Guy Rubinstein, Israel …

The objective of the present study was to determine the effects of dietary inclusion of different levels of pawpaw seeds powder (PSP) at different periods on the growth performance, survival rate, feed utilization and carcass composition of fry and fingerlings…

Anecdotal reports have indicated polyculture and biofloc systems can reduce outbreaks of diseases at shrimp farms. A laboratory study at the University of Arizona examined the effects of tilapia in controlling acute hepatopancreatic necrosis (AHPN) infection a…

Kassaye Balkew Workagegn, Hawassa University, Ethiopia, conducted this study to investigate the growth performance, feed utilization efficiency and survival rate of juvenile Oreochromis niloticus reared in aquaria at different water temperature.

In part three of three, A.M. Abdelhamid, Mansoura University, Egypt, aims to investigate the effect of dietary graded levels of Aqua Superzyme, Garlen Allicin, and Diamond V (Original XPC) on the chemical composition and histology of all-males mono-sex Nile ti…