Aspects of the biology of trap caught Chrysichthys nigrodigitatus (Lacepede), 1803 from the New Calabar River, Nigeria

Francis, Amiye

doi:10.5897/ijfa11.087

Cited by 5 publications

(4 citation statements)

References 9 publications

(8 reference statements)

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“…The vegetation present in the area is the red mangrove Rhizophora mangles and white mangrove Laguncularia racemose. Some of the dominant fish families in this ecosystem include the Lutjanidae, Clupeidae, Cichlidae, and the Claroteidae, but the most abundant are the Claroteidae (silver catfish) and Cichlidae (tilapias) [9]. Whereas the tidal mudflats species include the gobies, periwinkles, crabs, and mudskippers, only to mention a few.…”

Section: Study Areamentioning

confidence: 99%

Distribution of Toxic Metals in Biota, Sediments and Water from a Polluted Mangrove Swamp in Rivers State

Davies¹,

Odekina²,

Akoko³

2022

JGEESI

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Concentrations of Pb, Cd, and As were investigated in the tissues of mudskippers (Periophthalmus papilio), water, and sediments from Isaka-Bundu mangrove swamp in the Upper reach of Bonny Estuary, Niger Delta, Nigeria. The samples were collected from three stations every week for three months. The trace metals and physicochemical parameters were determined according to APHA 2000 methods. The concentration of trace metals by stations followed the order: station III (Dockyard) > station II (Bundu-Ama) > station I (Isaka). The trace metal distribution sequence in the fish, water and sediment according to their stations followed this sequence: Dockyard (Sediment = Pb > Cd > As; Water = Pb > Cd > As; Fish = Pb > As > Cd); Isaka (Sediment = Pb > Cd > As; Water = Pb > Cd > As; Fish = Pb > As > Cd); Bundu Ama (Sediment = Pb > Cd > As; Water = Pb > Cd > As; Fish = Pb = As > Cd). The overall, trace metal concentrations by samples followed this sequence; (Sediment = Pb > Cd > As; Water = Pb > Cd >As; and the mudskippers (P. papilio) = Pb > As > Cd) across the stations. The study revealed that all sampled sites in the Isaka-Bundu mangrove swamp had heavy metal values within Joint FEPA/WHO recommended biota load limits. High significant values of Pb and Cd were observed in sediment and water across the three stations, while tissue concentration of all three metals was relatively low and uniform. If proper measures are not taken to curb the excess discharges into the river given the activities in the catchment, the condition of the river will deteriorate badly and become a menace to its inhabitants and the host community which depends on it directly or indirectly.

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Section: Study Areamentioning

confidence: 99%

Distribution of Toxic Metals in Biota, Sediments and Water from a Polluted Mangrove Swamp in Rivers State

Davies¹,

Odekina²,

Akoko³

2022

JGEESI

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“…The New Calabar River (Figure 1) and its tributaries are all located in Rivers State. It is a low lying deltaic river which rises at approximately latitude 5°10'N and longitudes 6°50'E near Elele-Alimini and flows Southward for roughly 150km before its discharge into the Atlantic Ocean at about latitudes 4°20'N and longitudes 7°00'E (Francis and Elenwo, 2012). It occupies a low relief region, ranging from 0-50m above sea level at the low zone, to 50-100 above sea level at its source.…”

Section: Description Of the Study Areamentioning

confidence: 99%

Evaluation of Physicochemical Characteristics and Carbonate Equilibria System of the New Calabar River, Choba, Rivers State, Nigeria

Ojobo¹,

Adowei²

2022

jasem

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Carbonate equilibrium helps to critically determine the degree or level of pollution and its possible source. In this study the physicochemical properties and carbonate equilibria system of the New Calabar River, Choba, Rivers State, Nigeria was evaluated using standard techniques by analyzing the pH, total dissolved solid, bicarbonate ion, sulphate ion, chloride ion, total alkalinity and total hardness of five samples collected from strategic points along the River. Data obtained show that the pH ranged 5.93-6.33, while TDS values varied from 4770mg/l to 5280mg/l. The total alkalinity of the sample 1, sample 2, sample 3, sample 4 and sample 5 analyzed and their results are 70mg/l, 68 mg/l, 66 mg/l, 73 mg/l and 60.5 mg/l respectively. The total hardness of sample 1, sample 2, sample 3, sample 4 and sample 5 collected from the New Calabar River and the results are 913mg/l, 904 mg/l, 942 mg/l, 933 mg/l and 939 mg/l. The sulphate ion concentration for sample 1, sample 2, sample 3, sample 4 and sample 5 are 519.20mg/l, 510.5mg/l, 552mg/l, 543mg/l and 549.00mg/l, while the Chloride concentration varied from 3390.5 mg/l to 4,802 mg/l mg/l. Result indicated that all physiochemical parameters apart from total alkalinity was not within the WHO guidelines or standard and the river shows presence of weak acid deposits but very high concentration of chloride ion which indicates higher degree of organic pollution and also acidic in nature. Thus, the river poses a health risk to the rural communities who rely primarily on them as the only source of domestic water supply.

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“…Thus, the fishery is exploited by artisanal fisherfolks, and it is characterized by the use of different types of traditional fishing gear. These include pipe and drum traps, gills, and cast nets, while the craft in use is an unmotorized dugout canoe and paddle (Francis and Elewuo 2012). The upper reach of the New Calabar River is rich in C. nigrodigitatus broodfish (Uzukwu et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Knowledge and Practices of Chrysichthys Nigrodigatatus Fishery of the New Calabar River and Implications for Conservation

2023

Agrobiol. Records

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The Silver catfish, Chrysichthys nigrodigitatus is of major economic importance in Nigeria. This species has been harvested for decades; however, the inability to spawn in captivity and the availability of fry is still a limiting factor in aquaculture of the species. Thus, it has been subjected to over-harvesting and posing a threat to the population in many water bodies. The aim of this research was to study the knowledge and practice of Chrysichthys nigrodigitatus fishery of the New Calabar River and discuss the implications for conservation. We carried out a survey of fishermen and the fishery characteristics of C. nigrodigitatus of the New Calabar River using questionnaires containing closed-ended items, direct observations, and interviews. The results indicate that the fishing of the species was dominated by males, as it was an all-male affair. Additionally, the average household size was 5.57±persons. The fishermen identified two species of Chrysichthys in the river. The drum trapping was the most practiced method of fishing, and the fishery was unregulated. The fishermen demonstrated good knowledge of the breeding characteristics of the species which was the reason the fish could be easily trapped in drums. The adoption of drum trapping is going to be essential in developing captive breeding of the species because it is noninvasive.

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Aspects of the biology of trap caught Chrysichthys nigrodigitatus (Lacepede), 1803 from the New Calabar River, Nigeria

Cited by 5 publications

References 9 publications

Distribution of Toxic Metals in Biota, Sediments and Water from a Polluted Mangrove Swamp in Rivers State

Distribution of Toxic Metals in Biota, Sediments and Water from a Polluted Mangrove Swamp in Rivers State

Evaluation of Physicochemical Characteristics and Carbonate Equilibria System of the New Calabar River, Choba, Rivers State, Nigeria

Knowledge and Practices of Chrysichthys Nigrodigatatus Fishery of the New Calabar River and Implications for Conservation

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