Fishing characteristics and catch composition of the sardinella fishery in Ghana indicate urgent management is needed

Arizi, Evans; Collie, Jeremy S.; Castro, Kathleen; Humphries, Austin T.

doi:10.1016/j.rsma.2022.102348

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…Monthly landing records for S. maderensis fish catches in Ibeju-Lekki were obtained from LSADA and FDF records to calculate the monthly total catch, total efforts, and average catch per unit effort (CPUE). According to Arizi et al [61] and Stobart et al [62], catch per unit effort (CPUE) measures species abundance in fisheries. CPUE can be estimated by the quantity of the fish catch (weight) per unit of effort expended (time), which is proportional to the stock size [63].…”

Section: Trends Analysis Of S Maderensis Abundancementioning

confidence: 99%

Effects of Anthropogenic Activities on Sardinella maderensis (Lowe, 1838) Fisheries in Coastal Communities of Ibeju-Lekki, Lagos, Nigeria

Adewale,

Aheto,

Okyere

et al. 2024

Sustainability

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Small-scale fisheries are significant sources of nutrition and livelihood globally. However, increasing anthropogenic activities in coastal areas of developing countries have threatened the sustainability of artisanal fisheries and species. Fisheries of Sardinella maderensis, towards the global stock of which Nigeria contributes 9% and which is a significant livelihood source in the coastal communities of Ibeju-Lekki, Lagos, faces sustainability threats. This research investigated the effects of anthropogenic activities on S. maderensis fisheries in the coastal areas of Ibeju-Lekki, Lagos, Nigeria. The study adopted a mixed-method approach involving qualitative and quantitative research methods. These included species identification, water quality analysis, land-use change analysis, field surveys, focus group discussions, and interviews. Genetic analysis of the fish samples from the study area revealed that the species had a mean of 98% similarity to S. maderensis. While major urban and industrial land use has increased by 175% in the last four decades, the catch per unit effort (CPUE) of S. maderensis declined monthly to 0.0072 kg/H between 2003 and 2019. Linear regression indicated that anthropogenic variables explained approximately 39.58% of the variation in the CPUE (p < 0.001, R2 = 0.40). Water samples showed that heavy metal levels were above international limits, with high total petroleum hydrocarbon (TPH) pollution in all stations (27.56 mg/L–3985.40 mg/L). Physiochemical analysis of water samples indicated TDS levels higher than the acceptable limits (mean = 24,971.1 mg/L) and inadequate chlorophyll-a levels (mean = 0.01 µg/L). Hence, urgent strategies are required to mitigate anthropogenic threats through inclusive coastal management policies supporting resilient artisanal fisheries.

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Section: Trends Analysis Of S Maderensis Abundancementioning

confidence: 99%

Effects of Anthropogenic Activities on Sardinella maderensis (Lowe, 1838) Fisheries in Coastal Communities of Ibeju-Lekki, Lagos, Nigeria

Adewale,

Aheto,

Okyere

et al. 2024

Sustainability

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show abstract

“…Data on fishing efforts were derived from observed primary data by calculating the fishermen's number of trips per hour. According to Arizi et al [37] and Stobart et al [38], Catch Per Unit Effort (CPUE) measures species abundance in fisheries. CPUE can be estimated by the number of fish caught (weight) per unit effort expended (time), which is proportional to the stock size [39].…”

Section: Anthropogenic Factors and S Maderensis Abundancementioning

confidence: 99%

Effects of Anthropogenic Activities on <em>Sardinella maderensis</em> (Lowe, 1838) Fisheries in Coastal Communities of Ibeju-Lekki, Lagos, Nigeria

Adewale,

Aheto,

Okyere

et al. 2023

Preprint

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Small-scale fisheries are significant sources of nutrition and livelihood globally. However, increasing anthropogenic activities in coastal areas of developing countries have threatened the sustainability of artisanal fisheries and species. Fisheries of Sardinella maderensis (Lowe, 1838), to which Nigeria contributes 9% of the global stock and is a significant livelihood source in the coastal communities of Ibeju-Lekki, Lagos, face sustainability threats. This research investigated the effects of anthropogenic activities on S. maderensis fishery in the coastal areas of Ibeju-Lekki, Lagos, Nigeria. The study adopted a mixed-method approach involving qualitative and quantitative research methods. These include species identification, water quality analysis, land use change analysis, field surveys, focus group discussions and interviews. Results show genetic analysis of the fish samples from six stations revealed that the species had a mean of 98% similarity to Sardinella maderensis in NCBI. Multiple linear regression indicates that anthropogenic variables explained approximately 4.62% of the variance in the fish catch (p &lt; .001, R2 = .05). Water samples showed heavy metal levels were above international limits, high total petroleum hydrocarbon (TPH) pollution in all stations (27.56 mg/L- 3985.40 mg/L). Physiochemical analysis of water samples indicated TDS higher than acceptable limits (Mean = 24971.1 mg/L) and inadequate chlorophyll-a level (Mean = 0.01 µg/L). Hence, urgent strategies are required to mitigate anthropogenic threats through inclusive coastal management policies supporting resilient artisanal fisheries and marine spatial planning.

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Preliminary studies on the population dynamics of African Sicklefish (Drepane africana, Osorio 1892) from the coast of Ghana

Amponsah

2025

Aquat Res

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Individuals of African Sicklefish (Drepane africana), one of Ghana's most commercially and significant marine fish species, are declining in abundance. Therefore, the study aimed to provide the first estimates of growth and mortality parameters for sustainable management of the species from the coast of Ghana. The total length (TL) of 515 individuals of African Sicklefish sampled from June 2020 to July 2021 was measured and analyzed using the FISAT II software to determine the growth, mortality, and exploitation rates. The growth equation was Lt = 27.3 (1 - exp 1.80 (t + 0.09)). The size at first capture (Lc) and maturity (Lm) were 12.3 cm and 16.3 cm TL, respectively. The total mortality rate (Z), natural mortality rate (M), and fishing mortality rate (F) were 7.34, 2.73, and 4.61 per year, respectively. The exploitation rate was assessed at 0.63, indicating that the stock is currently overexploited. The fishery risks collapsing if sustainable management measures are not implemented since the maximum sustainable yield (Emax) slightly exceeds the current exploitation rate.

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Fishing characteristics and catch composition of the sardinella fishery in Ghana indicate urgent management is needed

Cited by 4 publications

References 14 publications

Effects of Anthropogenic Activities on Sardinella maderensis (Lowe, 1838) Fisheries in Coastal Communities of Ibeju-Lekki, Lagos, Nigeria

Effects of Anthropogenic Activities on Sardinella maderensis (Lowe, 1838) Fisheries in Coastal Communities of Ibeju-Lekki, Lagos, Nigeria

Effects of Anthropogenic Activities on <em>Sardinella maderensis</em> (Lowe, 1838) Fisheries in Coastal Communities of Ibeju-Lekki, Lagos, Nigeria

Preliminary studies on the population dynamics of African Sicklefish (Drepane africana, Osorio 1892) from the coast of Ghana

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