Investigation of biological condition of fish species in lower Ogun River wetlands, Lagos, Nigeria

Jenyo‐Oni, Adetola; Hassan, AA; Dauda, AB

doi:10.4314/ijbcs.v8i2.27

Cited by 3 publications

(3 citation statements)

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“…Hence, such an ever increasing intensity of the exploitation of the Erelu lake catchment and resources require monitoring of the water quality variables to obtain insight into the temporal and spatial variations associated with its prevailing trophic state. Studies have been carried out on several lakes and reservoirs within the same geographical catchment as Erelu lake on the physico-chemical characteristics, fauna and flora distribution, trace metal load, plankton and benthic macro invertebrates abundance (Olanrewaju et al, 2017;Falaye et al, 2015;Jenyo-Oni et al, 2014;Ayoola and Ajani, 2009) but, there has been no documented information on the physico-chemical parameters and productivity level of Erelu lake. This study, investigates spatial and temporal patterns in physico-chemical parameters and primary productivity of Erelu lake.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal limnological status of Erelu Reservoir, southwestern Nigeria

Kareem¹,

Ajani²,

Omitoyin³

et al. 2018

Ife Journal of Science

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Water quality monitoring is essential for determining the current condition and long-term trends of a reservoir for effective management. The spatio-temporal dynamics of the trophic lake is crucial in defining its water quality as well as biodiversity. Hence, the physico-chemical parameters and primary productivity of Lake Erelu were monitored for twenty-one months (July 2013-March 2015) to determine its suitability for sustainable fish production. The study area was temporally and spatially stratified. Temporal stratifications covered wet (April to October) and dry (November to March) seasons. Spatially, the lake was divided into lower (LZ), middle (MZ) and upper (UZ) zones based on geographical locations. Four sampling points were randomly selected in each zone. Water samples were collected monthly from each of the sampling points following standard methods and analyzed for variables such as biological oxygen demand (BOD), Nitrate (NO), Lead (Pb) and primary) and dry (1.41 ± 0.52 mgL) were significantly different. NPP did not differ significantly between seasons and between spaces. The physico-chemical parameters revealed seasonal and spatial variations which fall within desirable limits for fish production. Also, the lake was more productive during the dry season than rainy season.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal limnological status of Erelu Reservoir, southwestern Nigeria

Kareem¹,

Ajani²,

Omitoyin³

et al. 2018

Ife Journal of Science

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“…Most of the mean monthly values were below the recommended level and values in July, August and October were significantly different (p < 0.05) from other months with p values of 0.00, 0.04 and 0.01 respeectively. High ammonia levels can cause various gill damages, slow growth in fish, and a reduction in resistance to diseases (Jenyo-Oni et al, 2014). Sunday and Jenyo-Oni (2018) reported similar elevated levels of ammonia and attributed it to organic waste decomposition.…”

Section: Limnological Parametersmentioning

confidence: 99%

The influence of temporal variation of some limnological parameters on finfish assemblage in Osun River, Nigeria.

Iyiola

Jenyo‐Oni

2023

JoBAZ

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Background Anthropogenic activities is a major factor that determines the condition and sustainability of an environment. The nature and type of activities will determine the health, ecosystem services and general well-being of the environment. These activities have increased as a result of industrialization and urbanization, notwithstanding pressure on fish species for balanced nutrition and economic returns. The paucity of documented information about the limnological parameters and finfish assemblage in Osun River nessiciated this study. Results Mean temperature (18.7 ± 2.69 °C) and dissolved oxygen (3.2 ± 0.54 mg/L) values were below the recommended limit for fish survival, pH (7.1 ± 0.25) and ammonia (1.2 ± 0.18 mg/L) were within and above the recommended limits. The river had a total of 4544 finfish belonging to 11 families and 19 species. Chrysichthys nigrodigitatus, sampling zone A and Cichlid family had the highest abundance in the river with 21.00%, 24.20% and 32.50% respectively.Fin fish abundance had a negative relationship between dissolved oxygen (r = − 0.032), ammonia (r = − 0.668), pH (r = − 0.819); temperature and DO with ammonia(r = − 0.668, r = − 0.590) and pH (r = − 0.043, r = − 0.011) respectively. Dissolved oxygen (b = − 137.1), ammonia (b = − 522) and pH (b = − 93.4) had a negative effect on finfish assemblage in the river. Significant correlated values (p < 0.05) were observed between fin fish and temperature (p = 0.008), ammonia (p = 0.017), pH (p = 0.001). dissolved oxygen (b = − 2.14), ammonia (b = − 2.72) and pH (b = − 1.97) had a negative association with fin fish abundance while significance (p < 0.05) were observed with dissolved oxygen (p = 0.048). Conclusion It is worthy to note that human activities principally dictates the quality and quantity of limnological parameters which directly affect finfish assemblage; therefore proper environmental management is essential for sustenance of finfish in the river as elaborated by the United Nations Sustainable Development Goals.

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“…Variability in condition parameters can be caused by a variety of factors, including fish sex, species, maturation stage and season (Famoofo and Abdul, 2020). The condition factor (K) is used in ichthyological studies to compare the "condition" of fish, such as whether it is fat or healthy (Jenyo-Oni-et al, 2014). On the principle that heavier fish of a given length is in a better physiological state, the condition Factor was developed.…”

Section: Introductionmentioning

confidence: 99%

Species Composition, Size Distribution, Condition Factor and Growth Pattern of Cichlids From Zobe Reservoir, Dutsin-Ma, Katsina State, Nigeria.

ABUBAKAR¹,

Bichi²,

Dauda³

2023

FUDMAJAAT

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The species composition, size distribution, condition factor and growth pattern of cichlids from Zobe reservoir Dutsin-Ma, Katsina State was investigated between August and November 2022, with a view to understanding the distribution and well-being of cichlids in the water body. One hundred (100) cichlids were sampled from two (2) major landing sites (Makera and Garhi) of the reservoir, the fish were identified and separated before being transported in an ice box to the laboratory Biology Laboratory of the Federal University Dutsin-ma. At the laboratory, the length was measured to the nearest centimeter using a ruler while a sensitive weighing scale was used to measure the weight in grams. The results showed that four species were identified; Oreochromis niloticus (40), Oreochromis aureus (21), Sarotherodon galilaeus (21) and Coptodon zilli (18). The mean total length and weight were significantly higher (P<0.05) in O. niloticus compared to other species. The least was observed in O. aureus although it was not different significantly compared with C. zilli and S. galilaeus. The condition factor (K) of >1 was obtained in all the species with O. niloticus having the highest value of 2.26 which was significantly higher than 1.48 observed in O. aureus. All the species showed negative allometric growth, however, C. Zilli and O. aureus were very close to isometric growth with b values of 2.96 and 2.85 respectively. Although negative allometric growth was observed in all the species, the K values of >1 showed that all the cichlids in the Zobe reservoir are healthy and in good biological condition

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Investigation of biological condition of fish species in lower Ogun River wetlands, Lagos, Nigeria

Cited by 3 publications

References 5 publications

Spatial and temporal limnological status of Erelu Reservoir, southwestern Nigeria

Spatial and temporal limnological status of Erelu Reservoir, southwestern Nigeria

The influence of temporal variation of some limnological parameters on finfish assemblage in Osun River, Nigeria.

Species Composition, Size Distribution, Condition Factor and Growth Pattern of Cichlids From Zobe Reservoir, Dutsin-Ma, Katsina State, Nigeria.

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