The control of fishing parameters holds a prominent place in the strategy put in place by the managers of this sector in Ivorian waters. This work focuses on the description of seasonal variations in fish production parameters in the Potou lagoon. The data was collected from January 2020 to December 2021 in the Vitré station from surveys and analysis of fishermen's catches. The values of fishing effort, Catch per Unit of Effort and total production vary from season to season and from gear to gear. The total fishing effort is 9368 trips. It is higher (6576 trips) during the long dry season and lower (0 trips) in the short rainy season. Regarding the PUE values, they are higher (43.62 kg/trip) in the long dry season and lower (0 kg/trip) in the short rainy season. The highest catches are obtained in the long dry season with 274958.71 kg. Beach seines (231,524 kg or 35.90%) and gillnets (136,556 kg or 21.17% of total production) are the most efficient gears. The results of this work constitute a basic element for decision-making in the quest for a strategy for the sustainable management of fisheries resources in Côte d'Ivoire.
The fishing typology on the Buyo Lake Dam was studied monthly from July 2017 to June 2018. For this purpose, a questionary survey was administered to fishers, interviews were held with the lake managers and direct observations of the field were made. Fishing in this reservoir is of the artisanal type, practiced individually by Ivorians from non-Ivorians. A total, 215 fishermen were identified, including 70.7% Malians, 24.18% Ivorians and 5.12% Burkinabe. The fishing activity is dominated by fishermen of Bozo ethnicity from Mali (67.91%). Fishing is mostly practiced by adults ranging in age between 30 and 45 years and includes both professional fishermen and occasional. Most actors have no level of study. Only 11.54% of Ivorians have a primary level while 9.2% of non-Ivorians have done Koranic school. Gillnets are the most used catching gear. The low level of education of fishermen and the meshes below the standard they use are a real obstacle to the sustainable management of fisheries resources.
The reference diagnosis of Pellonula leonensis stock exploitation at Taabo Lake was established, in part, through the characterization of the shore seines used in the fishery this Fish species, and on the other hand, the rate of mature specimens, the percentage of fish at optimal size, and the percentage of super-breeders. The results of our study shows, that there is no correlation in the assembly of seines. The correlation between fall and length is - 0.43. The distance between the rope and the length is 0.07. The value of the relationship between pocket length and purse length is low (0.65). The mesh at the level of the net plies are composed of 4.63 to 25.04 mm and those of the pockets vary between 2.48 and 6.64 mm. The seines with P. leonensis are differentiated by their length with corollary 3 types of seines (large, medium and small). The current status of the technological characteristics of P. leonensis seines has a negative impact on this Fish species stock equilibrium at Lake Taabo. The biological indicators applied to this stock under exploitation shows, that this species is fully exploited. The rates of juveniles, and those at optimal size in the catches are respectively 49.38% and 61.27%. P. leonensis in Taabo Lake is threatened because the super-breeders reach 9.23% in catches. In addition, this species is captured before length of first sexual maturity. The length of this Fish species at the optimal size (33.49 to 40.93) and the size at first sexual maturity (31.85 mm) can serve as a reference for any co-management plan for "Mimie la goʺ fishery in Taabo Lake.
The caterpillar of Cirina butyrospermi represents a food source in southwestern of Burkina Faso. The proximate composition, minerals, amino acids and fatty acids of this insect were investigated. The results showed that Cirina butyrospermi caterpillars contained high protein (62.74%) and moderated lipid (14.34%) contents. The low percentages of ash and chitin (around 5%) were observed for this caterpillar. Minerals were mainly represented by potassium (1160 mg/100g), and iron (12.97 mg/100g) was the predominant trace element. 47.64% of the total amino acids in C. butyrospermi were essential amino acids. Linolenic acid (35.82%) and stearic acid (35.40%) were the most abundant fatty acids. Based in nutritional value, the caterpillar of Cirina butyrospermi is a potential source of protein, fat and minerals for human and animal feeding.
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