Juniper Publishers-Oceanography Open Access Journal

  Juniper Publishers -  Journal of Oceanography Abstract The aim of the present study was to investigate the effect of water source on survival rate %, growth performance, feed utilization, fish yield, economic evaluation and production of Nile tilapia ( Oreochromis niloticus)  monosex reared in earthen ponds. Nine earthen ponds were used and divided into three categories of three earthen ponds each. The average size of each pond was approximately 5200m2, 6000 monosex all male Nile tilapia were used in each pond and were stocked for 192 days. The fingerlings average weight was 4.38±0.03g/ fish, the fish were fed using a floating feed 25% crude protein, and were fed at a daily rate of 3% of their body weight. Results showed that body weight was increased significantly (P<0.05) with well water to 472.33g/fish. While were 354.17 and 320.17g/fish for fresh and agricultural drainage water, respectively. Specific growth rates (SGR%) increased with well water compared to both...

  Juniper Publishers -  Journal of Oceanography Abstract In this paper, the status of oceanic pasture and artificial reefs are introduced. The development of oceanic pasture and artificial reefs monitoring in the word is presented. Development of monitoring technology is divided into three stages according to the history. The first stage is that divers observing the ocean and obtain information about marine organisms. The second stage is using sensor such as sonar, cameras, to observe the ocean and obtain information about marine organisms. The third stage is employing underwater vehicles in the monitoring tasks. Finally we propose that underwater vehicles will be the future trend of artificial reef monitoring based on the advantages of underwater vehicles in monitoring. Keywords:  Oceanic pasture; Artificial reefs; Monitoring; Underwater vehicle; Observing Go to Status of Artificial Reefs Currently, Artificial reefs are built around the world: Australia has built Artific...

  Juniper Publishers -  Journal of Oceanography Abstract Human activities have been widely accepted as a driver of rapid trait change in wild fish stock globally with help of stressors. Fishing and invasive species are among the most important stressors which are affecting freshwaters fish stock from the lotic and lentic ecosystem. Study was carried out between the periods November 2015 to October 2016 from the Ghaghara river at Faizabad, India. The age composition of  C. mrigala  varied from 0+ to 8+ from the Ghaghara river at Faizabad. On the basis of sampled specimen in the length range from 15.7 to 88.7cm showed that the fish attained the mean length 25.3cm in 1+, 43.8cm in 2+, 57.5cm in 3+, 67.2cm in 4+, 74.7cm in 5+, 79.6cm in 6+, 83.9cm in 7+ and 87.3cm in 8+ age classes. The growth increments of  C. mrigala  was recorded as 25.3cm, 18.5cm, 13.7cm, 9.7cm, 7.5cm, 4.9cm, 4.3cm and 3.4cm for 1+ to 8+ age classes, respectively. The maximum growth increme...

  Juniper Publishers -  Journal of Oceanography Abstract This study investigates gonado somatic index, food and feeding habit of selected fish species of Lake Kalgwai Jigawa State, Nigeria. Samples of fish were collected every fortnight (July 2012-June 2013) at three major landing sites of the lake. The weight of each fish was recorded, gonads were removed, weighed and the gonadosomatic index (GSI) calculated. Stomach was also removed and the content analyzed using frequency of occurrence and point method. Result obtained reveals GSI to range from 2.39±0.08% in Nile perch Latesniloticus [ 1 ] to 5.92±0.29% in Nile tilapia Oreochromisniloticus [ 1 ]. The stomach content analysis in this study distinguished the fish species into two major groups; Latesniloticus, Mormyrusmacrophthalmus Günther, 1866 and Bayad bagrus bayad Forsskal [ 2 ] were observed to exhibit carnivorous feeding habits and feed predominantly on crustacean, fish, fish parts, mollusks, insects and ...