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  • Artisanal fishing  (21)
  • Additives
  • perovskiteferroelectricpowder neutron diffraction
  • FISON  (24)
  • American Chemical Society
  • International Union of Crystallography (IUCr)
  • 1
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    How many tricks can an old perovskite play? (2017)
    International Union of Crystallography (IUCr)
    In: IUCrJ
    Details
    Publication Date: 2017-04-27
    Keywords: perovskiteferroelectricpowder neutron diffraction
    Electronic ISSN: 2052-2525
    Topics: Geosciences , Physics
    Published by International Union of Crystallography (IUCr)
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  • 2
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    Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3 (2017)
    International Union of Crystallography (IUCr)
    In: IUCrJ
    Details
    Publication Date: 2017-03-09
    Description: The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150–300°C; these two phases correspond to Glazer tilt systems a−a−a− and a+a+c−, respectively. At 500°C a ferroelectric–paraelectric transition takes place from P42mc to P42/nmc, retaining the a+a+c− tilt. Transformation to a single-tilt system, a0a0c+ (space group P4/mbm), occurs at 750°C, with the final transition to the aristotype cubic phase at 850°C. The P42mc and P42/nmc phases have each been seen only once and twice each, respectively, in perovskite crystallography, in each case in compositions prepared at high pressure.
    Keywords: perovskiteferroelectricpowder neutron diffraction
    Electronic ISSN: 2052-2525
    Topics: Geosciences , Physics
    Published by International Union of Crystallography (IUCr)
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  • 3
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    Status of fisheries and aquaculture development in Ekiti State, Nigeria (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23340 | 19325 | 2018-04-07 17:19:26 | 23340 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Ekiti State has limited water surface area but blessed with some rivers and seven big reservoirs on which some artisanal fishery is being carried out by over 400 fisher folks. Fish farming in Ekiti state is largely dominated by Clarias gariepinus culture. Interest in fish farming is on the increase as farmers construct concrete fish tanks as small as 1.5m2 as well as series of contour earthen ponds or tanks as big as 30m2. The total number of ponds has grown numerically from 96 at the inception of the state in 1996 to about 2000 in 2008. The move towards private/public partnership in aquaculture development will improve the economic and nutritional status of the region.
    Description: Includes:- 1 table.;3 figs.;5 refs.
    Keywords: Aquaculture ; Fisheries ; Nigeria ; Ekiti State ; freshwater environment ; Fish culture ; Freshwater aquaculture ; Aquaculture ; Artisanal fishing ; Fishery development ; Stock assessment
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 76-79
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  • 4
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    Morphometric features and proximate body composition of rocky freshwater prawn (Caridina africana, Kingsley 1882) at Erin-Ijesa waterfalls, Osun State Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24209 | 19325 | 2018-05-19 06:41:34 | 24209 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: An investigation was conducted on the morphometric features and proximate body composition of rocky freshwater prawn, Caridina africana occurring at Erin-Ijesa Waterfalls in Osun State, Nigeria. The adult prawns were collected at the first layer of the Waterfalls using scoop nets and locally fabricated sieves because of the shallow nature of the water body and tiny size of the species. Morphometric features were measured using measuring board and Vernier calipers while the proximate analysis was determined by atomic absorption spectrophotometry in the laboratory. The morphometric variables placed the species correctly into the Infra order Caridea and family Atyidae because the first and second chelipeds were shorter than the remaining three pairs of walking legs. Male prawns were significantly bigger (p〈0.05). than the females as revealed in the morphometric features. The proximate analysis showed that C. africana is composed of 58.79% protein, 5.42% lipid, 11.56% carbohydrate, 14.7% ash and 0.21 % crude fibre. The micro-nutrient composition included iron, zinc, copper, nickel and cadmium. The values for these nutrients make the study to suggest that C. africana could be a nutritive food bio-material for humans and other livestock nutrition especially the fin-fish aquaculture programme.
    Description: Includes: 2 tables.;Also includes: 11 references.
    Keywords: Biology ; Fisheries ; Caridina africana ; Nigeria ; Erin-Ijesa waterfalls ; Morphometrics ; caridina africana ; Proximate composition ; Micrinutrient ; Erin-Ijesa waterfalls ; freshwater environment ; Morphometry ; Biochemical analysis ; Shrimp fisheries ; Body conditions ; Nutritional requirements ; Nutritive value ; Lake fisheries ; Artisanal fishing ; Males ; Females
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 228-230
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  • 5
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    Heavy metals concentrations in Chrysichthys nigrodigitatus in Arakanga Reservoir, Abeokuta, Ogun State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24218 | 19325 | 2018-05-19 06:58:26 | 24218 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study investigates the morphometric and meristic features of Chrysichthys nigrodigitatus in relations to heavy metal concentrations. Varying sizes of Clarias nigrodigitatus were obtained with the help of fisher-folks, from Arakanga reservoir Ogun state, Nigeria. Water samples were also collected alongside with fish samples per week and five of the samples were sent to laboratory for analysis to determine the presence of four heavy metals in both fish and water. Lead, Cadmium, Nickel and Arsenic were investigated by atomic absorption spectrophotometer (AAS). Four tissues; gills, kidney, liver and muscle were compared with the level of metals in the water. Lower concentrations of metals were recorded in water except for Cadmium which is higher, than in fish. Lower concentration of heavy metals found in fish and water was less than that recommended by the World Health Organisation (WHO's) guideline for maximum concentration recorded in the tissue of the samples. Lead was found to be dominant in the gills of C. nigrodigitatus, while Cadmium was found to be highest in the water sample from Arakanga reservoir. There is significant difference (P〈0.05) in Nickel and Arsenic concentration in the tissues of C. nigrodigitatus and water. It was concluded that though the heavy metals of interest were present in measurable quantities, they were still within safe limits for consumption.
    Description: Includes: 11 references.
    Keywords: Pollution ; Fisheries ; Chrysichthys nigrodigitatus ; Nigeria ; Ogun State ; Arankanga reservoir ; freshwater environment ; Heavy metals ; Freshwater fish ; Reservoir fisheries ; Artisanal fishing ; Lead ; Toxicants ; Pollution effects ; Quality assurance ; Morphometry ; Meristic counts ; Water analysis ; Freshwater pollution ; Nickel ; Arsenic ; Cadmium ; Fish consumption ; Health and safety
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 265-268
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  • 6
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    Food and habits of the Batrachoid, Batrachoides liberiensis off the Qua Iboe River estuary, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24223 | 19325 | 2018-05-19 07:09:15 | 24223 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: We studied the trophic attributes of the toadfish, Batrachoides liberiensis off the Qua Iboe River estuary Nigeria, between August 2008 and July 2009. The fish species has no well defined stomach; the intestine was used as gut. Gut contents analysis of 360 specimens of the toad fish revealed that 11 food items (Penaeus notialis, Sersama alberti, crayfish remains, unid fish, fish bones, fish remains, unid gastropod, insect remains unid clam and sand grains)] were ingested. The food items were re-assigned into 6 major ecological categories based on food ponderal index (%FPI): Pisces (FPI= 35.33%), Crustacea (FPI= 20.73%), unid Gastropoda (FPI=14.32%), Mollusca (FPI= 12.48%), Insecta (FPI= 11.64%) and FPI of 5.50% sand grains. Males were significantly higher in feeding intensity (Average gut fullness, AGF: t = 2.083, 358 df, P〈0.05) vis-a-vis the females. There were similarity in rank-order of the seasonal dietaries (spearman-rank correlation: rs = 0.871, P〈0.02). Sex ratio was male-biased. B. liberiensis in the Qua Iboe estuary is carnivorous, exhibiting affinity to piscine as major dietaries.
    Description: Includes: 11 references.
    Keywords: Ecology ; Fisheries ; Batrachoides liberiensis ; ASE ; Nigeria ; Iboe River. ; Batrachoides liberiensis ; Qua Iboe River Estuary ; Nigeria ; Trophic attributes ; brackishwater environment ; Food ; Feeding ; Stomach content ; Food consumption ; Artisanal fishing ; Fishery surveys ; Food composition ; Food preferences ; Brackishwater fish
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 281-283
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  • 7
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    Growth performance of Clarias gariepinus fingerlings fed diets with graded levels of yeast (Saccharomyces cerevisiae) used as a floater additive in concrete tanks (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24159 | 19325 | 2018-05-13 13:04:38 | 24159 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Completely randomized design with duplicate groups were used to study the growth performance of 400 fingerlings of Clarias gariepinus in 2m x 2m x 1m concrete tanks in an out-door hatchery complex of National Institute for Freshwater Fisheries Research (NIFFR), New Bussa, Niger State, Nigeria. Graded levels (0, 1,2,3 or 4) % of yeast (Saccharomyces cerevisiae) was included into a 40% crude protein (C.P) NIFFR floating basal diet and fed to Clarias gariepinus in tanks for 16 weeks and 35% in the last 4 weeks. This was to determine the optimum level of supplemental yeast inclusion as a floater additive into diets of C. gariepinus and to quantify feed and its cost for raising a kilogram of the fish fed diets. The experiment was geared towards development of cost effective standard floating feed for Clarias gariepinus. There was no significant difference in weight gain (WG), feed consumed (FC), specific growth rate (SGR), survival, cost of feed consumed (CFC) and palatability test of flesh (P〉0.05) except FCR (P〈0.05) and feed cost per kilogram of fish (P〈0.05) at the end of 8 and 20 weeks. There was no histopathological defect observed on the fish and fish carcass. It was concluded that 2% or 1 % level of yeast can be included in NIFFR floating feed with the assurance of producing a kilogram of C. gariepinus with a feed of N300.00 under good management practices based on ingredient ruling price at the time of this study and this might be capable of increasing farmer's income in fish production.
    Description: Includes: 1 table and 2 figures.;Also includes: 21 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Niger ; Yeast ; Floating additives ; Performance ; Clarias gariepinus ; freshwater environment ; Growth rate ; Freshwater fish ; Fingerlings ; Artificial feeding ; Feeding experiments ; Feed ; Yeasts ; Additives ; Culture tanks ; Cost analysis ; Performance assessment ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 32-36
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  • 8
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    Development of an improved dug canoe for artisanal fisheries (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24081 | 19325 | 2018-05-12 14:14:25 | 24081 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A dug canoe similar to the one commonly used by artisanal fisherfolks 4.82M (LOA) was designed and constructed using locally available materials, as an alternative to hardwood that is becoming very scarce. The canoe have least cost, easy construction, adequate stability, light weight and easy maneuverability, as its attributes. The light displacement (weight empty) was 37kg which is light enough in relation to craft of same size commonly used by fishermen. The capacity of the canoe was 210 kg (3 persons) and total production cost of N18,400 which is not beyond the reach of an average fisherfolk. The craft is small and fall among the category of crafts that account for the greater percentage of national fish landing. The canoe also closely resembles the local fishing crafts, hence easy acceptance by local fisherfolk.
    Description: Includes: 3 tables, 2 figures and 2 plates;Also includes: 8 refs.
    Keywords: Fisheries ; Nigeria ; Canoe ; Plywood ; Hardwood ; alternative ; freshwater environment ; Artisanal fishing ; Canoe fisheries ; Canoes ; Construction ; Construction materials ; Marine transportation ; Design
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 94-97
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  • 9
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    Fishing gear survey of Tatabu floodplain (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24084 | 19325 | 2018-05-12 14:19:12 | 24084 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study was carried out for a period of three months from June to August, 2008. Five fishing villages namely Tatabu, Tsafa, Tunga Fulani, Tunga Sarkin ruwa and Lafiagi were used as study area by administering a total of 50 questionnaires (I.R. 10 questionnaires in each village). The study was conducted to assess the type of fishing gear mostly used by the fishermen in Tatabu floodplain. The greatest proportion (98%) of the fishermen interviewed were within age bracket 25-35 years. Majority of the respondents were Muslims and married form the highest percentage (60%). Three types of fishing gears, gillnet, long line and Malian Trap were used. The fishermen using gillnets had the highest percentage (44.2%) and those using Malian traps were the lowest percentage (23%). the fishermen using mesh size 50.8mm were highest (38.7%) and those are using mesh size of 101.6mmformed the lowest percentage (6.5%). The fishery crafts, 38% of fishermen use 4.3 meters length overall (LOA) and fishermen using 5.5 meters formed the lowest percentage (6%). Most of the respondents (88%) realized about N100-900 as daily income while 12% obtained more than N900 as daily income (54%) of the respondent. The problems militating against successful fishing activities includes lack of provision of social amenities, provision of loan and procurement of fishing inputs at subsidized rate.
    Description: Includes: 9 tables;Also includes: 9 refs.
    Keywords: Fisheries ; Nigeria ; Tatabu Floodplains ; freshwater environment ; Fishing gear ; Surveys ; Flood plains ; Artisanal fishing ; Fishermen ; Seasonal variations
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 109-116
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  • 10
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    The socio-economic analysis of small scale fish farmers in Lagos State fish farm estate, Ikorodu, Nigeria (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24100 | 19325 | 2018-05-19 06:34:02 | 24100 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study was conducted to evaluate the socio-economic analysis of small scale fish farmers in Lagos state fish farming estate in Ikorodu, Nigeria. The primary data were obtained from 60 respondents with structured interview guides and face to face interview, which were selected using simple random sampling techniques. The result revealed that most (88.3%) of the fish farmers are male while (31.40%) are in the active age distribution of 31-40 years, university education (63.0%) and 58.3% were married, 73.4% had a household size that ranged between 3 - 5 persons. Results of the descriptive analyses and tests of significance however showed that there was a significant relationship between socio-economic characteristics and constraint of fish farmers in the estate, there is also a significant relationship between income of fish farmers and constraints of the fish farm enterprise. Implications of these findings were critically-examined, and pertinent recommendations were proffered based on the salient findings in the study.
    Description: Includes: 6 tables and 1 figure;Also includes: 17 refs.
    Keywords: Aquaculture ; Sociology ; Nigeria ; Lagos ; Farm estate ; fish farming enterprises ; Ikorodu ; Small scale ; Socio-economic ; Nigeria ; freshwater environment ; Fish culture ; Artisanal fishing ; Socioeconomic aspects ; Evaluation ; Aquaculture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 214-222
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