Int. J. of Aquatic Science 2008-8019 10 2 2019 09 01 Effects of stocking density and artificial shelters during the nursery production of giant freshwater prawn, Macrobrachium rosenbergii (De Man, 1879) in net cages 76 82 EN Arlene L. Avillanosa Krizia Meryl A. Ecube Mark D. Española Christopher Marlowe A. Caipang Herminie P. Palla Joel G. Becira Relative performance of stocking densities and types of artificial shelters in the nursery production of the giant freshwater prawn, Macrobrachium rosenbergii in net cages was assessed. For the effects of stocking density, giant freshwater prawn juveniles (0.2 g ±0.001) were cultured in 12 75-L net cages within a 6 m3 concrete tank at stocking densities of 8, 15 and 30 individuals/net cage, and each net cage was provided with black polyethylene mesh nets as artificial shelters. For the effects of artificial shelters, the following materials were used: mesh bundles of used black polyethylene nets (Treatment 1), cut pieces of bamboo (Treatment 2) and PVC pipe stacks (Treatment 3), with triplicate for each treatment, was stocked with 15 individuals/net cage. No significant effects of the shelter types and stocking densities on most of the zootechnical parameters were obtained. Feed conversion ratio (FCR) and efficiency (FCE) were significantly better at lower stocking density. There were lesser variations in individual growth of the prawns in net cages that were stocked at a density of 15 individuals/net cage and provided with mesh bundles as artificial shelters, while the net cages with either cut pieces of bamboo or PVC pipe stack had heterogeneous growth during the latter part of the nursery rearing phase. Macrobrachium rosenbergii,Bamboo,growth,Prawns http://www.journal-aquaticscience.com/article_85702.html http://www.journal-aquaticscience.com/article_85702_1779787c9713877e3c732420275a4357.pdf

Int. J. of Aquatic Science 2008-8019 10 2 2019 09 01 Physiological and immunological characteristics of red spot disease-resistant hybrid carp named "Surskiy malokostny" 83 87 EN Galina Iozepovna Pronina Petrushin Petrushin Elena Ivanovna Shishanova Lubov Anatolievna Rozumnaya The industrial fish farming is followed by lower immune status of cultured specimens in connection with high stocking density, handling and other technological factors. Specific immune-modulating substances or selection for higher immune status could be used for solving of this problem. The most dangerous multifactorial infection in commercial carp farms is red spot disease (RSD) caused by Pseudomonas, Aeromonas, and Spring Viremia of Carp Virus Rhabdovirus carpio. The authors had obtained a new commercial mirror hybrid carp “Surskiy Malokostny” (with lower number of bones) characterized by high rates of weight growth, survival and immune resistance. The application for selection achievement for this cross had No. 77897. The high immune resistance of new hybrid is connected with characteristics of one of parent lines, Angeline mirror carp exposed to long-term selection after outbreak of RSD more than 60 years ago. The leucogram of new hybrid was characterized by high levels of myeloid segmental cells suggested full development of inborn cell immunity. The lower level of lysosomal cation protein in neutrophils of new hybrid before winter comparing with control full-scaled carp of commercial line is the feature of high immune resistance. hybrid carp,immune resistant,red spot disease http://www.journal-aquaticscience.com/article_88576.html http://www.journal-aquaticscience.com/article_88576_b843ece00275cde9077637c6d5d5beb6.pdf

Int. J. of Aquatic Science 2008-8019 10 2 2019 09 01 The effect of Artemia urmiana, Earthworm, Cow heart and concentrate as supplementary diets on skin color and pigmentation of Oscar fish (Astronotus ocellatus) 88 93 EN Masoud Seidgar Fereidun Mohebbi Ali Nekuiefard dr.nekuiefard@gmail.com Mahmoud Hafezieh jhafezieh@yahoo.com Shahram Dadgar shdadgar@yahoo.com Asad Abbaspour Anbi asadanbi1208@gmail.com Saber Shiri shiri21002@gmail.com Skin coloration has a key role in ornamental fish trade. The amount of carotenoid pigments has a decisive influence on the color of muscle and skin of edible and ornamental fish. Also, there is a need to add carotenoids in the diet of cultured fish. Live foods especially Artemia play an important role in ornamental fish feeding regarding growth and skin color and thus marketing. In this study, the effects of different diets including concentrate, 67% concentrate and 33% frozen earthworm, 67% concentrate and 33% frozen Artemia urmiana as well as 67% concentrate and 33% frozen cow heart on total carotenoids and carotenoid pigments of Oscar fish skin was studied. A total of 360 Oscar fish with initial weight of approximately 1.6 g were cultured for 2 months in 4 feeding treatments, each in 3 replicates. The total carotenoids, astaxanthin, cantaxanthin and β-Carotene contents of the fish were analyzed. Results indicated that in all treatments asthaxanthin was the highest amount of carotenoid pigmentation of Oscar skin. Adding Artemia urmiana in the diet induced the higher total carotenoid and asthaxanthin levels in the skin of Oscar fish. Astronotus ocellatus,carotenoid pigments,Artemia urmiana,Earthworm,Cow heart http://www.journal-aquaticscience.com/article_92954.html http://www.journal-aquaticscience.com/article_92954_a9f60dfe0671f2b80e94ca2be1068ef6.pdf

Int. J. of Aquatic Science 2008-8019 10 2 2019 09 01 Seasonal variation of parasitic infections in fish Johniuss dussumieri (Perciformes: Sciaenidae) 94 97 EN Rakhshinda Khurram Khan Nasira Khatoon Faiz Muhammad Muhammad Shafi A total of 534 individuals of Johniuss dusssumieri were examined for helminth infection from January 2015 to December 2015. Out of 534 fishes, 289 were infected with helminth parasite and prevalence rate was 63%. Maximum prevalence of trematodes infection was 92% in August and September while the minimum was 40% in January. It concluded that there was a higher presence of diversified parasitic infection. Consumption of fish in the regular diet is growing. Therefore it is necessary to have high quality fish consumption Trematodes,Infection,Intensity,Edible Fishes,Karachi Coast http://www.journal-aquaticscience.com/article_79166.html http://www.journal-aquaticscience.com/article_79166_49b16dbe9636db9d94629c02b9171853.pdf

Int. J. of Aquatic Science 2008-8019 10 2 2019 09 01 The first record of the African catfish (Clarias gariepinus) in Puerto Rico 98 100 EN Ruber Rodriguez Barreras Camille Zapata Arroyo We recorded the occurrence of the African catfish Clarias gariepinus in the inland waters of southeastern Puerto Rico for the first time, increasing the number of exotic freshwater fish on the island. Two individuals of C. gariepinus were collected in the municipality of Guayama and deposited in a zoology collection. This opportunistic species represents a serious concern due to the reported adverse ecological impact on native ecosystems. The source of the introduction remains unclear, but we suggest the aquarium trade or fish farmers as two potential sources. Further studies are important to control the expansion of C. gariepinus in Puerto Rico. new record,exoic species,Clarias gariepinus,walking catfish,Puerto Rico http://www.journal-aquaticscience.com/article_81042.html http://www.journal-aquaticscience.com/article_81042_8c9515115db3faf1decf5ab82a174938.pdf

Int. J. of Aquatic Science 2008-8019 10 2 2019 09 01 Temporal variation in physico-chemical characteristics, phytoplankton composition and biomass in Lake Solai, Kenya 101 111 EN Eunice C. Koskei Kiplagat Kotut Justin Nyaga Steve Omondi Oduor The physico-chemical properties and phytoplankton community structure of Lake Solai were investigated between April 2018 and August 2018. Water temperature, conductivity (EC), dissolved oxygen (DO) content and pH were measured in-situ. Nutrient content and phytoplankton biomass were determined in the laboratory. All the water properties; temperature (mean: 23.19 ± 0.13 °C), DO (mean: 6.35 ± 0.03 mgL-1 ), total suspended solids (TSS) (mean: 220.85 ± 8.11 mg L-1), turbidity (mean: 702.51 ± 9.40 NTU), nitrate nitrogen (NO3-N) (mean: 0.75 ± 0.02 mg L-1)total phosphorus (TP) (mean: 20.57 ± 0.51 mg L-1) showed significant temporal variation (P<0.001). Five groups of phytoplankton were identified; Cyanobacteria, was the most dominant with 14 species, Chlorophyta (11 species), Bacillariophyta (8 species), Euglenophyta (3 Species) and Chrysophyta (2 species).The high TP concentration makes it a eutrophic system. The high turbidity create a poor light climate that select against a number of biota that could inhabit the lake allowing for few algal organisms, especially the Cyanobacteria that have the potential to exploit this niche and establish potentially harmful algal blooms. The DO levels were within the permissible limits recommended for fisheries and aquatic life. Hence, the possibility of introducing salt tolerant fish should be explored. Physico-Chemical Properties,Lake Solai,Eutrophic,Turbidity,Biomass http://www.journal-aquaticscience.com/article_95526.html http://www.journal-aquaticscience.com/article_95526_cc0c6fde8c1c6fe9066a5ea68d151bc5.pdf