Length-weight models and condition factors of fishes from Okpara Stream, Oueme River, Northern-Benin

Imorou, Rachad Sidi; Adité, Alphonse; Sossoukpe, Edmond; Abou, Youssouf

doi:10.22161/ijfaf.3.3.1

Cited by 4 publications

(7 citation statements)

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“…With regards to length-weight patterns, the current research indicated that allometric coefficients (b) varied between 2.2588 for Synodontis sorex and 3.0859 for Synodontis clarias along with significant (P˂0.05) correlation coefficients (r) ranging between 0.84 and 0.92. These results agreed with those recorded (2<b<4) by Hazoume et al (2017) andSidi Imorou et al (2019) respectively in the Sô river and in Okpara stream from Benin freshwater fishes. In general, the results revealed that most Mochokids (7/8) exhibited negative allometric growth with slopes (b) less than 3, indicating that the fish becomes less rotund as they increase in weight (Deekae and Abowei, 2010).…”

Section: Condition Factorssupporting

confidence: 93%

“…However, the current records for Synodontis nigrita a (SL = 10.5 cm) and Synodontis budjetti (SL = 21.0 cm) were lower than the values reported by Sidi Imorou et al were lower than the values reported by Entsua-Mensah et al (1995), SL = 19.0 cm, SL = 16.2 cm, SL = 21.6 cm, respectively in the Volta River in Ghana. These differences in Mochokid sizes were the results of different habitat conditions, mainly water quality, food availability, high fishing pressure, and levels of environmental degradations (king, 1991, 1996Hart, 2007;Sidi Imorou et al, 2019).…”

Section: Condition Factorsmentioning

confidence: 99%

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Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Arame¹,

Adité²,

Adjibade³

et al. 2020

Aquat Res

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In the Niger River in Benin, the fishes of Mochokidae family are of high commercial and economic importance. The current study investigated size structures, length-weight relationships and condition factors of these catfishes in order to evaluate their plumpness. Mochokids were sampled monthly from February 2015 to July 2016 with traps, seine and gillnet. Overall, the fish species showed unimodal, bimodal and tri-modal standard-length distributions. Length-weight models displayed allometric coefficients (b) varying between 2.236 and 3.380, indicating positive and negative allometric growth with correlation coefficients (r) ranging between 0.87 and 0.99. Condition factors were moderate to low and varied from K= 0.409 for Synodontis frontosus to K= 7.276 for Synodontis sorex that showed a higher value K= 31.13 in aquatic vegetation. Major threats were the use of chemical fertilizers and pesticides for adjacent agriculture, the retrieval of water for agriculture and domestic uses, the invasion of floating plants, the introduction of exotic fish species and overfishing. These data constitute valuable fisheries documentation that will contribute to conservation, valorization and sustainable exploitation of Mochokid fishes in Niger River in Benin.

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Section: Condition Factorssupporting

confidence: 93%

Section: Condition Factorsmentioning

confidence: 99%

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Arame¹,

Adité²,

Adjibade³

et al. 2020

Aquat Res

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“…The disparity could be caused by adverse environmental factor in the man-made lake or the differences in lotic and lentic water bodies or the peculiarity and physiological distinction between S. obesus and S. schall of the same genus. Again, the K-values recorded in this study are quite higher than values reported by Sidi Imorou et al [13] for S. schall (K=0.67+0.08) from Okpara stream and (K= 0.790) for S. clarias from River Niger Northern Nigeria [5]. The mean value of K (2.35) recorded in this study is lower than the values of 2.732 and 7.276 for S. schall and S. sorex respectively reported by Arame et a.…”

Section: Condition Factor (K)contrasting

confidence: 84%

“…In different parts of Nigeria especially in the Northern part, studies had centered on the length frequency distribution, LWR and condition factor of S. schall, S. robbianis, S. resupinatus, S. clarias, S. sorex and S. frontosus in different water bodies and the works include those of Araoye, [8,10] and Araoye et al [3] for Synodontis schall (Teleostei: Mochokidae) all in Asa Lake Ilorin, Nigeria; Adeyemi [4] on Synodontis resupinatus in Idah Area of River Niger, Nigeria; Akombo et al [11] in Lower River Benue; Azua and Akaahan, [12] in Lower River Benue, Makurdi, Nigeria, Sidi Imorou et al [13] in Okpara Stream, Nigeria all on S. schall and works of Arame et al [5] who studied the fishes of Mochokidae family in Niger River, Northern Nigeria. In the western part of Nigeria, few works also were carried out on Synodontis species.…”

Section: Introductionmentioning

confidence: 99%

Size Structures, Length-Weight Relationships and Condition Factors of Synodontis obesus (Boulenger, 1898: Siluriformes, Mochokidae) in the Lower Cross River, Nigeria

Ukpatu

Udoidiong²,

Nkanta³

2023

AJOB

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Size Structures, Length-Weight Relationships and Condition Factors of Synodontis obesus ((Boulenger, 1898: Siluiformes, Mochokidae) were carried out with standard methods in the Lower Cross River, Nigeria to assess the population dynamics of the rarely studied but commercially important species. A total of 241 specimens (124: wet season and 117: dry season) were collected at Ayadehe Head Bridge fishing port in Itu Local Government Area, Akwa Ibom State, Nigeria from August 2020 to January 2021. The overall abundance showed high size variability within months and between seasons. The total biomass of the specimens collected was heavier in the wet season (12020.33g =12.02Kg) than in the dry season (10709.3g =10.7Kg) with an overall biomass of (22729.63g =22.7Kg). The overall size structures were: 15.0 – 28.30 cm, mean: 21.52.44 cm TL; 12.0 – 20.5 cm, mean: 15.881.6 cm SL and 13.20 – 21.50 cm, mean: 16.881.64 cm FL. The total weight of the species varied from 42.30 – 166.0g with overall mean value of 94.31603g. The length and body weight of fish samples caught for both wet and dry season were significantly different (p<0.05).The length composition of the species exhibits unimodal, bimodal and trimodal growth patterns. The species had heterogeneous groups or cohorts (1+, 2+ and 3+) with variation in body weight. The length-at-first maturity of S. obesus was 20.85 cm mid length. Growth coefficient (b) varied between (2.497) for the wet season and (2.617) for the dry season respectively with the mean growth coefficient (b=2.532) in the LWR (W= aLb). The species exhibited negative allometric growth pattern with an increase in length resulting to increase in weight of the fish. The condition factor (K) decreased with increased in the size of fish and ranged from 2.17-2.57 (Mean: 2.35) in both wet and dry seasons. The average condition factor (K) (2.35±0.15) was 1.0 for both seasons revealing that the species was in good physiological state of well-being. The condition factor (K) of S. obesus by size category showed K-values for recruitssexually mature fishaged fish. Thus fish size is an exponential index of condition factor. The results of this study constitute valuable fisheries data that would enhance the availability, conservation, valorization, exploitation and sustainability of S. obesus in the Lower Cross River, Nigeria.

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“…Length and weight are biometrics data easily taken and available in most datasets from monitoring studies. Despite the simplicity, it provides highly useful information for fisheries management and can be used in different applications like the estimation of biomass from length data or comparisons between growth patterns and morphologic differentiation of the same species from different populations (Imorou, Alphonse, Edmond, & Youssouf, 2019; Karachle & Stergiou, 2012).…”

Section: Introductionmentioning

confidence: 99%

Length‐weight relationship of fish species from Central Amazon floodplain

et al. 2020

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Length-weight relationship (LWR) is likely the most useful tool to estimate indirect growth, body condition, and to understand the life cycle of fishes (Camara, Caramaschi, & Petry, 2011; Froese, 2006). Length and weight are biometrics data easily taken and available in most datasets from monitoring studies. Despite the simplicity, it provides highly useful information for fisheries management and can be used in different applications like the estimation of biomass from length data or comparisons between growth patterns and morphologic differentiation of the same species from different populations (Imorou, Alphonse, Edmond, & Youssouf, 2019; Karachle & Stergiou, 2012). The Amazon basin shelters a very highly diverse freshwater fish fauna that occupy a wide variety of environments. The middle stretch of the Amazon River sustains very important fishery activities, which targets about 100 species coming from its main channel and associated floodplain environments (Santos, Ferreira, & Zuanon, 2006). Here we present LWRs for 39 fish species based on 18 years of monthly fish sampling in the Catalão Lake, at the confluence of Amazonas and Negro rivers.

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Length-weight models and condition factors of fishes from Okpara Stream, Oueme River, Northern-Benin

Cited by 4 publications

References 0 publications

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Length-weight relationships and condition factors of Mochokidae (Pisces: Teleostei: Siluriformes) from Niger River, Northern Benin

Size Structures, Length-Weight Relationships and Condition Factors of Synodontis obesus (Boulenger, 1898: Siluriformes, Mochokidae) in the Lower Cross River, Nigeria

Length‐weight relationship of fish species from Central Amazon floodplain

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