To provide a theoretical basis to improve the survival and growth rate and optimize diet of sheatfish (Silurus soldatovi), the activities of certain digestive enzymes and alkaline phosphatases were investigated during larval development of one-ten day old individuals. Results indicated that sheatfish larva (~ three days after hatching) had high levels of alkaline protease activity, which peaked...

The fisheries of the lower reaches Tigris river, north Qurna in Basrah Governorate have been analyzed during period from January to December 2005. fishing boats used there varied lengths form 5 10m, which 50% were motorized with 25-75 HP. Seine and drift gill nets are main gears used, their ranged 100 200m mesh sizes 14-100mm 7-32mm for seine respectively. number fishermen each boat 1 7. Twenty...

The European catfish (Silurus glanis) was introduced in Italy during the last century for aquaculture purposes, and now it is well-established. S. glanis an invasive species a top predator that can deplete prey supply surrounding habitat, leading to changes aquatic food web. Consequently, its presence considered threat native fish populations. Its Lake Maggiore (Northern Italy) recent there lac...