نشریه علوم آبزی پروری پیشرفته
سال چهارم شماره 2 (پاییز و زمستان 1399)

This study was conducted to determined the effects of different period of protein restriction during short periods of limitation period of one week and two week on growth performance and body composition of rainbow trout(oncorhynchos mykiss) in during of eight weeks. Experimental diets were formulated to contain protein restriction and control diet of protein levels. The experiment was a completely randomized design consisted of three treatments in triplicates and fish with initial weight of . g were randomly assigned and distributed at a density fish per tank ( L). The control treatment fed with protein during the period , Treatment of with protein and protein, with weekly alternation and treatment three with and protein with weeks protein alternation during the experiment. At the end of experiment, treatment obtained the highest body weight and the most specific grows rate among of the protein restriction treatments. Statistical analysis indicated that there was not significant difference (P>) between amounts of FCR, PER, FCE, FI and SV in protein restriction treatments and control treatment. The highest carcass protein content was observed in treatment . Thus at the end of experiment compensatory growth obtained in treatment .

One of the necessities for aquaculture development is approaching to cultivation of new species. Among new species, marine fishes have high importance due to advantages like high growth rate and viability for cage culture. Cobia (Rachycentrom conadum) is one of the endemic marine fish in southern Iran. Cobia has a high potential for aquaculture due to its characteristics such as rapid growth, lower puberty age, delicious taste and high market value. This species is cultivating in different countries around the world, specially southeast Asia since the 90s, but there is no significant experience on commercial rearing of this valuable species in Iran so far. There are considerable stocks of cobia in southern Iran, specially in the Persian Gulf which eases access to its eggs and fries. Development in aquaculture of cobia depends on access to sufficient information about propagation and rearing of this valuable species. Therefore, the present paper evaluated practical manual for propagation and rearing of cobia.

Lobster is one of the most important marine species in the seas and oceans, which has been considered by human communities from long time ago due to its commercial importance and nutritional value. Lobsters are a family of large marine crustaceans belong to the invertebrate phylum Arthropoda and found in the order Decapoda and live in marine/salt waters. These organisms are distributed from the polar region to the temperate zone, but the diversity and abundance of their species in the tropics is greater than elsewhere. The tendency to culture lobster dates back to more than 100 years ago. But the first advances in the culture of spiny lobster back to 1988, when the larvae of the African spiny lobster were reared to the post larvae stage (Puerulus). The main problem in commercial lobster culture is difficulty in larval growth stage, although extensive studies have been conducted recently and some progress has been made. However, for better exploitation of lobster resource, increase income from the culture industry and attention to the sustainability of its natural resources, its culture from the juvenile and mature stage to the market size, which is called fattening, is importance. This paper examines the culture of spiny lobster as well as the growth of Puerulus and juvenile lobster using extensive studies by other researchers around the world. In addition to study the importance of lobster culture in different countries, a summary of its current situation in different regions will be given.

Due to the increasing global demand for shrimp and the development of its cultivation in the country,for increase production per hectare and survival rate, increase the storage weight of post-larvae and reduce the length of the breeding period is recommended. In this study, a number of post-larvae prepared from a breeding center; Stored in a greenhouse and a group weighing 0.7 g and a group weighing 2 g were stored in pond. Growth and survival indices were compared with controls that were stored directly at the same stocking density. Ponds were stored at the same density of 14 pieces per square meter. The size of the pound was all equal and was 7000 square meters. Each treatment had 3 replications. The breeding period was 56 days. A biometry was performed every 15 days. The results showed that the control treatment with a final weight of 8 g was harvested with 84% survival. Treatment 2 weighing 15 g with 87% survival and Treatment 3 weighing 21 g with 87% survival It can be concluded that by increasing the storage weight of stored larvae, the final weight and production per hectare will increase, the survival will increase, the breeding period will decrease, the risk of disease will decrease and the profit will increase.

Three viral diseases “Infectious pancreatic necrosis (IPN), Infectious hematopoietic necrosis (IHN), and Viral Hemorrhagic Septicemia (VHS)” are deadly infectious diseases for coldwater fish that can occur each year among susceptible fish in fish farms (breeding farms). They cause mortality and severe economic losses in cold water fish farms. These diseases sometimes cause damage to this industry and also reduce the interest of investors to invest in this profitable industry. These diseases are not only infectious and contagious but also are worldwide. The diseases cause significant damage in most of the pioneer countries in the production of rainbow trout. Due to the viral nature of these diseases, despite new scientific advances in the world, it is still not possible to completely cure the diseases also no effective vaccines have been developed for them yet. Therefore, awareness of hygienic rules, control and prevention ways of these diseases, can play an important role in reducing the economic losses and expenses of the fish farmers. Also, observance of hygienic principles, full implementation of biosecurity, proper nutrition and health management practices on farms, can be properly effective and efficient in controlling, preventing and reducing the relevant morbidity, mortality and economic losses.

Common carp (Cyprinus carpio) is one of the most important freshwater fishes in global aquaculture and is an endemic fish in the Caspian Sea, as well. furthermore, the benefits of intensive monoculture employment have been considered over polyculture in the recent decade, but the lack of consideration to health infrastructures in aquaculture can lead to fatal diseases. Viral diseases are the most significant threats to carp farming in the world. recognizing them, implementing prevention and control methods can be a prohibition to following economic losses. Spring viremia of carp, Carp pox disease, Koi sleepy disease (Carp edema virus disease) and Koi herpesvirus disease are all recently reported diseases that infect common carp, caused by viral pathogens. This review presented details on methods of treatment, prevention, disease control strategies, and laboratory procedures for the diagnosis of all viral diseases of common carp (Cyprinus carpio). Prospective methods to reduce the risk of diseases as well as their limitations are presented. It is hoped that the review could contribute to aquaculture in the prevention and controlling of Cyprinus carpio viral diseases, and serve the healthy and sustainable development of the aquaculture industry.