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  • 1
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    Gonadosomatic index, fecundity and egg size of (Synodontis) S. eupterus (Boulenger) in River Rima, north western Nigeria (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24089 | 19325 | 2018-05-12 14:34:56 | 24089 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study was conducted to provide information on gonadosomatic index, fecundity and egg size on S. eupterus from River Rima, North-Western Nigeria, from November 2005 and December 2008. 1,610 samples, comprising of 781 females, 816 males and 13 samples whose sexes could not be identified were examined, giving a female: male ratio of almost 1:1. Gonadosomatic index (GSI), fecundity (F) and diameter of the oocytes (ES) were analysed. Linear regression analysis was used to determine the relationship between GSI, fecundity and egg size with total length (TL), total weight (TW), gonad weight (GW) and gonad maturation stages (MS). Six stages of gonad maturation were established. Mean GSI for female and males were 7.30 0~c6.16SD and 1.05~c1.23SD, respectively. It varied (P〈 0.05) with sex, size class and gonad maturation stage, and exhibited significant (P〈0.05) correlation with fish TL, TW and MS in females but not (P〉0.05) in males. Mean fecundity was 2834.45~c2530.87SD and it correlated most significantly (P〈0.05) with GW; and inversely with MS. Mean egg size was 1.31~c0.33mm. It has non significant (P〉0.05) relationship with TL, TW and MS but significant one (P〈0.05) with GW. Egg size distribution was bimodal, with different sizes of egg in ovaries indicating multiple spawning. This study provided baseline information on some aspects of reproduction which is important in the management of A. occidentalis in River Rima.
    Description: Includes: 4 tables and 2 figures;Also includes: 25 refs.
    Keywords: Ecology ; Fisheries ; S. eupterus ; A. occidentalis ; Nigeria ; Rima R. ; Gonadosomatic index ; fecundity ; oocyte diameter ; gonad maturation stage ; S.eupterus ; freshwater environment ; Gonadosomatic index ; Fecundity ; Fish eggs ; Size ; Reproduction ; Fish ; Spawning ; Frequency ; Oocytes
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 135-143
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  • 2
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    Potential impact of climate change on fisheries and aquaculture in Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24584 | 19325 | 2018-05-20 15:57:28 | 24584 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Climate change will have significant impacts on Nigeria's freshwater and marine aquatic systems. and hence on the countries fisheries and aquaculture. Fisheries and aquaculture are highly vulnerable to changes in weather pattern. and the impacts, which could be negative or positive, will vary from the coastal areas to the drier northern parts of the country. Elevated water temperalures will affect fish physiological processes, thereby affecting spawning. survival of the juveniles, recruit into the exploitable phase of population, population size, production and yield. The impacts of increased flooding of the freswater bodies will be negative through erosion of watershed, destruction of fish feeding and breeding habitats, decrease in primary productivity and alteration of the normal resilience of the aquatic systems, or positive in expansion of aquatic habitats for primary and fish productions especially during the dry season. Drought will exacerbate draw down of the lakes and reservoirs, and insufficient flow in the river hasins for spawning and primary pro duction thereby affecting fish production. Rise in the water level of the Atlantic ocean will lead to intrusion of more salty wafer into The river delta areas, and inundation of the coastal low-lying areas, thus affecting distribution of both the freshwater and marine fishes as a result of changes in the physical and chemical properties of the waters. The impacts will ultimately affect fish population, production and supply, thereby affecting the livelihood of over 26 million people engaged in the primary and secondary sectors of the fisheries industry, as well as food security of the country. The adaptation and mitigation strategies will be based on the peculiar characteristics and interactions of fisheries and aquaculture within the framework of feasible policy instruments. Strategies and policy measures need to be evolved to combat the observable and projected impacts of climate change on fisheries and aquaculture, in order to protect the livelihoods of the fishing communities and food security.
    Description: Includes: 13 references.
    Keywords: Atmospheric Sciences ; Aquaculture ; Fisheries ; Nigeria ; Climate change ; Fisheries ; Aquaculture ; Impacts ; Mitigation ; Food security ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 76-80
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  • 3
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    Food and feeding habits of Protopterus annectens (Owen) in River Rima, Sokoto, Nigeria (2021)
    Fisheries Society of Nigeria | Kaduna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23291 | 19325 | 2018-03-30 14:49:43 | 23291 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-13
    Description: The food and feeding adaptations of Protopterus annectens (Owen) in River Rima, Sokoto, Nigeria, were studied. Fish samples were collected from August to October, 2007. The Stomach contents were analyzed using frequency of occurrence method. The fish is an omnivore, feeding mainly on other fish, crustaceans, molluscus, leaf parts, seeds, pytoplankpton and detritus. The junviles showed more indigestion towards leaf parts and detritus while the adults exhibited more diverse and complex feeding. The fish gut length was 1.1 times the body length.
    Description: Includes:- 3 tables.;17 refs.
    Keywords: Ecology ; Fisheries ; Protopterus annectens ; Nigeria ; Rima R. ; freshwater environment ; Feeding behaviour ; Food chains ; Food preferences ; Stomach content
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 56-60
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  • 4
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    Proximate composition and some mineral elements of horse radish (Moringa oleifera) seedmeal (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24212 | 19325 | 2018-05-19 06:46:12 | 24212 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Proximate composition of Horse radish (Moringa oleifera) Seeds meal was investigated. Standard analytical methods were used to determine the nutritive value; Na and K were estimated using framephotometer, Ca , Mg and P were determined titrimetrically. The results (in g/100g sample) obtained were (7.67%) moisture, (3.56%) ash, (23.75%) crude lipid, (1.16%) fiber, (40.23%) crude protein and (23.50%) carbohydrate. The meal is rich in K (1775mg %), Na (61.23mg %), Ca, Mg and P were 0.33mg%, 0.60mg% and 3.24mg%. Moringa oleifera seed meal could therefore be considered as potential rich sources of nutrient to supplementing plant based diets in aquaculture.
    Description: Includes: 17 references.
    Keywords: Aquaculture ; Ecology ; Nigeria ; Sokoto State ; Moringa plant ; freshwater environment ; Seeds ; Nutritive value ; Chemical analysis ; Flora ; Water content ; Proteins ; Fish culture ; Diets
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 243-245
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