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.