Advances in Aquaculture and Fisheries Management

Advances in Aquaculture and Fisheries Management ISSN: 9424-2933 Vol. 3 (7), pp. 261-263, August, 2015. © International Scholars Journals

Full Length Research Paper

Supplement usage and development of Clarias gariepinus fed to four different commercial feeds

Osinbajo Meshack Abiodun

Department of Animal Science and Fisheries Management, University of Agriculture, Makurdi, Makurdi, Nigeria.

E-mail: [email protected]

Accepted 20 June, 2015

Abstract 

Several studies had been conducted on the nutritional requirements of African catfish, Clarias gariepinus. Nevertheless, currently there is a gap about the gross composition of feed ingredients required for formulation of commercial feeds. The aims of this feeding trial were to investigate whether fish fed four different commercial feeds have a significant growth rate and nutrient utilization. A total of 120 fish samples were stocked for a triplicate feeding trial (10 fish for each replication) in 4 separated tanks with 4 different feeds: Euro, Melick, Coppens and Durante (T1), (T2), (T3) and (T4) respectively. During all the trial, the water quality and growth parameters were determined according to standard methods and no significant differences were found among the water quality parameters determined. The mean weight gain (MWG) and specific growth rate of T3 were significantly higher than those of other treatments. Statistics showed that protein efficiency ratio (PER) of T3 was significantly higher than other treatments. Contrary to the above trend, the feed conversion ratio (FCR) of T2 was significantly higher than other treatments. According to the results of this study, fish fed with Coppens feed showed a significant growth rate and nutrient utilization.

Key words: Feeding trial, treatments, growth, nutrient utilization, commercial feeds.

Advances in Aquaculture and Fisheries Management ISSN: 9424-2933 Vol. 3 (6), pp. 249-260, June, 2015.  © International Scholars Journals

Full Length Research Paper

Study on Ecology of zooplankton profusion in Bhoj wetland, India

Priyanka A. Kapoor

Department of Environmental Sciences and Limnology, Anand Agricultural University, Anand, India.

E-mail: [email protected]

Accepted 24 May, 2015

Abstract 

The influence of physicochemical properties of wetland, on its zooplankton composition and abundance were investigated for two years between February 2008 and January 2010. In both the years, total of 62 species of zooplankton were identified. At all the stations of the water body Rotifera recorded the highest percentage of 45% followed by cladocera (29%), Protozoa (13%), Copepoda and Ostracoda (8 and 4%) respectively. In terms of density, total zooplanktonic density during 1st year was 7395 Ind.l-1 that increased to 8543 Ind.l-1 in the 2nd year. In the first year, Copepoda (2 Ind.1-1 to 2415 Ind.1-1) constituted the largest group making up 63.41% of the zooplankton population density, this was followed by Cladocera (21.27%) with having numerical density ranges between (3 Ind.1-1 to546 Ind.1-1) and Rotifera group (14.15%) having a density varied from 2 to 207 Ind.1-1. The genus Bosmina (34.7%) dominated the Cladoceran group and Polyarthra and Brachionus (19.8 and 18.7%) recorded highest in terms of percentage among the Rotifera group, while as the genus Cyclops (51.5%) recorded the highest number among the Copepoda group and was also dominant genus among the zooplankton genera. During second year of study period, the Copepoda (70.08%) which had a density variation between 2 Ind.1-1 to 4491 Ind.1-1 and this was followed by Cladocera (18.67%) with numerical density ranges between 3 to 337 Ind.1-1 and Rotifera (9.08%) having density between 2 Ind.1-1 to 171 Ind.1-1. The genus Chydorus (21.1%) dominated the Cladoceran group and genus Lecane (22.0%) recorded highest in terms of percentage among the Rotifera group, while as the genus Cyclops (75.0%) recorded the highest number among the Copepoda group and was also dominant genus among the zooplankton genera. The water body is receiving domestic discharge leading to large amount of nutrient inputs and high amount of phosphate and nitrate in the water body indicates that water is eutrophic in nature.

Key words: Zooplankton, abundance, diversity, Shannon –Weaver Index, Bhoj wetland.

Advances in Aquaculture and Fisheries Management ISSN: 9424-2933 Vol. 3 (5), pp. 241-248, May, 2015. © International Scholars Journals

Full Length Research Paper

Effects of diet substitution on growth performance, energy consumption and digestive enzymes in Macrobrachium rosenbergii postlarvae

Mukesh Mehta Ambani

Department of Fisheries and Aquaculture, Acharya N. G. Ranga Agricultural University, Hyderabad, India.

E-mail: [email protected]

Accepted 10 April, 2015

Abstract 

The present study was conducted to assess the growth promoting ability of Chlorella vulgaris on Marobrachium rosenbergii postlarvae. The experimental diets were prepared by fishmeal replacement with C. vulgaris at different levels (25, 50, 75 and 100%). The prepared feeds were offered to the M. rosenbergii postlarvae during 90 days in triplicate. At the end of the feeding experiment, survival rate, weight gain, specific growth rate and feed conversion efficiency were significantly (P < 0.05) higher in 50% C. vulgaris inclusion diet fed PL group. Similarly, total protein, amino acid, carbohydrate and lipid contents were significantly (P < 0.05) higher in specimens fed 50% C. vulgaris supplemented diet. The feeding rate, absorption rate, conversion rate were significantly (P < 0.05) higher in 50% C. vulgaris supplemented diet fed PL group. At this level of replacement, the activity level of digestive protease, amylase and lipase were significantly (P < 0.05) higher in 50% C. vulgaris supplemented group. Among all the experimental groups, the 50% fishmeal replacement with C. vulgaris inclusion diet fed group, showed significant performance. The present results revealed that the partial replacement of fish meal with C. vulgaris is favorable for M. rosenbergii postlarval culture.

Key words: C. vulgaris, digestive enzymes, growth performance, M. rosenbergii.

Advances in Aquaculture and Fisheries Management ISSN: 9424-2933 Vol. 3 (4), pp. 232-240, April, 2015. © International Scholars Journals

Full Length Research Paper

Studies on bacteria in fish species of commercial importance at the Aquaculture Unit in Nigeria

William K. Achebe

Department of Marine Sciences, Faculty of Agriculture, University of Ibadan, Ibadan, Nigeria.

E-mail: [email protected]

Accepted 15 March, 2015

Abstract

Bacteria diseases are widespread and can be of particular importance in fish farming. Bacteria exist as micro flora in water until certain environmental conditions such as poor water quality occur, which could impose a stress on fish, thereby making them vulnerable to infection, most especially by pathogenic bacteria. This study was carried out to assess and compare the bacteria diversities and population in Clarias gariepinus, Sarotherodon melanotheron and Oreochromis niloticus, in the three grow out ponds of the aquaculture unit of the Department of Marine Science and Lagoon Front of the University of Lagos. It also aims at determining their public health significance. The experiment was carried out between May-September 2013. Water samples were collected from the three grows out ponds in the Department of Marine Sciences and from Lagos lagoon Front of the University of Lagos. In each case, water samples were analysed for the possible indicator organisms of faecal and industrial pollutions such as Escherichia coli, Staphylococcus aureus, Salmonella spp., feacal streptococcus, Vibrio spp., and Clostridium spp. From the result obtained, all the bacteria listed above were first seen as common bacteria in all the samples of water analysed. Further studies (biochemical tests) also reveal bacteria such as Klebsiella spp., Proteus spp., Enterobacter aerogenes, Citrobacter spp. and Pseudomonas aeroginosa. Moreover, the same indicator bacteria seen in water samples were also detected in the different body parts (flesh, mouth, gill and gut) of each of the fish species analysed, both from the Departmental ponds and Lagoon front, except Clostridium perfringes (C. welchii), Vibrio cholera and Salmonella typii which were found in the gut of those fish species from the departmental ponds A-C and in the mouth, gill and gut of the fishes from lagoon front. The population of each of these bacteria was found to be highest in the gut region, followed by the gill, the mouth and least in the flesh. There was no significant difference in the population of each of the bacterial across pond water (P>0.05). Same is the case with each bacteria analysed across body parts of the fish species (skin, mouth, gill and gut) in the Departmental ponds, that is, no significant difference (P>0.05). But, when compared with the lagoon front (both for water and fish samples) the difference was highly significant (P<0.05). None of the population of the bacteria in the ponds exceeds the limit for human consumption. The bacteria load in the lagoon fish (skin, mouth, gill and gut) was higher than the recommended limit for human consumption. Therefore, they are not fit for consumption most especially samples from the mouth, gill and gut, except effective processing treatment is employed before consumption. Due policy should also be taken by the government to curtail the tradition of indiscriminate discharge of untreated effluent into the lagoon.

Key words: Bacteria load, Clarias gariepinus, Sarotherodon melanotheron and Oreochromis niloticus, Lagos lagoon

Advances in Aquaculture and Fisheries Management ISSN: 9424-2933 Vol. 3 (3), pp. 228-231, March, 2015. © International Scholars Journals

Full Length Research Paper

Feeding behavior of Mugil cephalus (Linnaeus, 1758) in Nigeria

*Clement Okorocha, Yakubu T. Adebamowo, D. Y. Nihu

Email: [email protected]

Department of Fisheries, Faculty of Agriculture, University of Jos, Jos, P.O.Box 3340, Nigeria.

Accepted 8 February, 2015

Abstract 

The present study is aimed to provide information on the abundance of natural foods needed by Mugil cephalus in the Elechi Creek. The natural food of M. cephalus in the Elechi Creek was studied from stomach contents of the fish. The stomach contents were analyzed using two methods; the frequency of occurrence and numerical methods. Plant materials, diatoms, algae and dinoflagellates constituted its main food. Plant materials were found to be the most preferable food where it occurred in 67.0% of the examined fish. Annelids, fish larva, fish parts, insect parts and crustaceans comprised the food of animal origin. Sand/mud and organic matter occurred in about 11.0 and 73.0% of the examined stomachs respectively. These results indicate that M. cephalus is omnivorous plant materials were the most abundant food items by numerical and occurrence methods in the gut of the fish species.

Key words: Algae, food items, frequency of occurrence, numerical method, stomach content.