World Aquaculture and Fisheries Conference

October 26-27, 2020
Tokyo, Japan

Alaa El-Dahhar

Potential speaker for Aquaculture conference 2020 - Alaa El-Dahhar
Alaa El-Dahhar
Alexandria University, Egypt
Title : Marine Fish Nutrition


The most important Marine Fish species in Egypt are European sea bass Dicentrarchus labrax L. and Gilthead sea bream Sparus aurata. They are also important species in Europe, and in the Mediterranean Sea area. Turkey, Greece, Spain, Italy, Egypt, and Croatia are the largest producers in the Mediterranean region.

Production of both species in Egypt is about 42 thousand tons in 2013, increased to 56 thousand tons in 2017 (2%) of the total fish production. The strategy of live food utilization for all marine fish species with small sized larvae for a period after hatching is necessary. This feeding strategy based on live prey is rather expensive, needs well train staffs and high-quality equipment, while the nutritional and sanitary values of prey are difficult to control. Using the artificial micro diet (MD) with exogenous zymogen (EZ) to minimize the duration of this period is in our interest in the marine fish production Lab (MFPL), faculty of Agriculture (Saba Basha) Alexandria University since nineties of the last century.

Determination of protein and energy requirements of different fish species of fresh water; Nile tilapia (Oreochromis niloticus) and mullet (Mugillidae) was carried out during the nineties of last century. However, during the last two decades preparation of weaning diets for the larvae of some marine fish species is a target of our lab. These species are stiped mallet, Solea, sea bream, and sea bass. Determination of protein and energy requirements and P/N ratios were also done for sea bass fingerlings and sea bream fingerlings.

Because many marine fish producers have not applied the same good advice about their own nutrition to feeding their fish. Part of this may be because the nutritional requirements of captive fish were previously not understood by producers. However, now we recognize that the diet we provide our fish will determine how long they live in our farm and how good they look. A poor or unbalanced diet can result in general health problems. For example, marine water fish that do not have an appropriate diet can suffer from some health problems, such as lateral line and fin erosion, weight and color loss, listlessness and greater susceptibility to pathogens. To help prevent these, we will look at the types of foods available to feed our marine water fish, and we will also briefly discuss feeding regimens. One of the best ways to ensure that you meet the dietary needs of your marine water fish is to feed them a diet as close to their natural foods as possible. Unfortunately, this ideal approach is usually difficult, if not impossible, to do. So, the next best thing is to provide them with as varied a menu as possible to cover all the nutritional bases.


Professor ALAA A. EL-DAHHAR had completed his Ph.D. Animal Production (Fish Nutrition). Currently he is an Emeritus Professor at Animal and Fish Production Dept. Faculty of Agriculture (Saba Basha) Alexandria University, Alexandria. EGYPT. He had 35 years of experience in marine & fresh water pond aquaculture. He has more than 50 publications.

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