scholarly journals Innovative Technologies to Promote Sustainable Recirculating Aquaculture in Eastern Africa—A Case Study of a Nile Tilapia ( Oreochromis niloticus ) Hatchery in Kisumu, Kenya

2020 ◽  
Vol 16 (6) ◽  
pp. 934-941 ◽  
Author(s):  
Samuel Clough ◽  
Julian Mamo ◽  
Kyra Hoevenaars ◽  
Tamas Bardocz ◽  
Paw Petersen ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Eastern Africa ◽  
Innovative Technologies ◽  
Recirculating Aquaculture ◽  
Nile Tilapia Oreochromis Niloticus

scholarly journals Behavioral responses of Nile tilapia (Oreochromis niloticus) by sublethal exposure to chlorpyrifos: a case study in Twin Lakes of West Sumatra

2018 ◽  
Vol 5 (4) ◽  
pp. 205-210
Author(s):  
Taufiq Ihsan ◽  
Tivany Edwin ◽  
Winna Anggraeni
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Behavioral Responses ◽  
Behavioral Changes ◽  
Test Species ◽  
Nile Tilapia Oreochromis Niloticus ◽  
West Sumatra ◽  
Contact Poison ◽  
Sublethal Concentrations

Background: The most commonly used insecticide by 99.8% farmers in West Sumatra, is chlorpyrifos which contains organophosphates. Chlorpyrifos is used to kill insects and other pests and works as the contact poison, gastric toxins, and inhalation. It is very useful for farmers in keeping the plants such as corn, citrus, peanuts, and so forth. Chlorpyrifos can enter the water body with direct application to control pests or indirectly through either spraying or washing during high rainfall in spray applications for plant leaves. Chlorpyrifos is also used in farming in the region of Twin Lakes (Diatas Lake and Dibawah Lake), West Sumatra, Indonesia. One of the most important fish that is cultivated in this region is Nile tilapia (Oreochromis niloticus). Methods: The acute toxicity (LC50-96 h) of chlorpyrifos for Nile tilapia in studies was 0.076 mg/L. Sublethal concentrations used for the studies were one-seventh (0.011 mg/L) and one-fourteenth (0.005 mg/L) of the LC50-96 h. The test animal was exposed to the both sublethal concentrations for 1, 7 and 14 days. Behavioral responses were studied in the experimental periods. Tilapia that exposed chlorpyrifos exposure was exhibited irregular body movements, gills and fins motion, mucus secretion, breathing at the surface, and anal excretion. Results: It was revealed that the longer the exposure time, the more visible behavioral changes in fish, as well as the concentration variations, it means that the higher the concentration, the more visible changes in physiological behavior of fish. Correlation values (R) were was 0.75–0.99. Conclusion: These behavioral responses can be used as a tool in biomonitoring program to monitor ecotoxicity risk of chlorpyrifos to the test species, especially in the region of Twin Lakes, West Sumatra, Indonesia.

Effects of water flow rates on growth and welfare of Nile tilapia (Oreochromis niloticus) reared in a recirculating aquaculture system

2019 ◽  
Vol 27 (2) ◽  
pp. 449-462 ◽  
Author(s):  
Kwasi Adu Obirikorang ◽  
Nelson Winston Agbo ◽  
Christian Obirikorang ◽  
Daniel Adjei-Boateng ◽  
Sefakor Esinam Ahiave ◽  
...  
Keyword(s):  
Water Flow ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Recirculating Aquaculture System ◽  
Flow Rates ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Nile Tilapia Oreochromis Niloticus

scholarly journals Growth Performance of GMT and Mixed Sex Nile Tilapia Oreochromis niloticus on Natural and Supplemental Feeds

2007 ◽  
Vol 20 (4) ◽  
Author(s):  
P.W. PERSCHBACHER
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Food Sources ◽  
Natural Food ◽  
Ictalurus Furcatus ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Genetically Improved

Attention has been focused on genetically-improved stocks and strains of tilapia. A greenhouse recirculating aquaculture system (RAS) of three 540 L tanks stocked with 100 37.2 g genetically male tilapia (GMT) Nile tilapia, Oreochromis niloticus, and three identical tanks with the same number of 38.1 g mixed sex Nile tilapia, was used to measure response to floating 3.0 mm catfish pellets (32 % protein) fed once per day at four different rates based on body weight day-1 (2-4 % BW day-1). Feed rate and amount were changed every 14 days based on growth measurements. For growth comparisons on natural feeds (primarily phytoplankton), two 10.5 m3 net pens were each stocked in August with 105 7.7 g Nile tilapia m-3 of each group in each of two 1.0 ha blue catfish Ictalurus furcatus fingerling ponds and not fed. Fish were harvested in November. GMT fish outperformed mixed sex fish on both feed sources, and at most feed rates. In RAS trials at 2, 2.5, 3.0 and 4.0 % BW feeding, percentage growth day-1 was 1.95, 2.11, 2.21 and 3.31 for GMT, and 1.60, 2.22, 1.97 and 2.86 for mixed sex; and the associated food conversion ratio (FCR) was 1.54, 1.37, 1.37 and 1.04 and 1.64, 1.35, 1.42 and 1.20, respectively. At harvest in net pens, GMT fish were 25 % larger than mixed sex. Growth was 1.3 and 1.0 g day-1 on natural food sources for GMT and mixed sex, respectively.

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