Embryonic and Larval Development Stages of the African Catfish Clarias gariepinus (Burchell, 1822) (Teleostei, Clariidae) in The Ouargla, Algeria

Abstract

This study was designed to investigate for the first time in the region of Ouargla, Algeria, the events and timing of the embryonic development of African catfish, C. gariepinus (Burchell, 1822). The embryonic development was carefully monitored using a binocular magnifier 10 and 20 lenses that reveal details on live specimens from fertilization to the first take of food. The offensive and foul odor continues to be the characteristic smell of the hatching stage. Pigmentation and continuous spread of cephalo-caudal melanophore in fry hatched on the first day. The barely hatched larvae are photo-phobic. The yellow reserve is reduced and leads to the ability to swim easily, and the majority starts feeding on the fourth day. The vitellin reserve is significantly reduced, allowing the larvae to feed exogenously. The events observed in our opinion demonstrate the presence of two exceptionally critical parameters: the use of a high-quality diet and the guarantee of a clean and quality source of water, meeting the standards of aquaculture farming.

Development of a field-ready optical coherence tomography system for assessing 2,4-D dimethylammonium-based herbicide exposure in African catfish

“…These eggs, measuring between 1.3 and 1.5 mm (not shown in the data), align with findings from prior research by Iswanto et al 27 . and Behmene et al 28 . As detailed in Fig.…”

“…These reconstructions provide views comparable to those seen under a light In this investigation, we evaluated African catfish eggs at different developmental stages, specifically observing the consequences of 2,4-D dimethylammonium exposure. These eggs, measuring between 1.3 and 1.5 mm (not shown in the data), align with findings from prior research by Iswanto et al 27 and Behmene et al 28 As detailed in Fig. 6, the research initiated with a microscopic review of fertilized eggs at the 4-h mark, considering both the control and those exposed to 5 μL∕L of 2,4-D dimethylammonium.…”

“…This research highlighted that, after 13 h, while the control group eggs developed typically, those exposed to 2,4-D dimethylammonium manifested significant irregularities, such as expansive voids and aberrant egg casings. Beyond 18 h, the ensuing phase is termed the larva stage 28 . At 48 h, there is a marked evolution in organ development.…”

“…Beyond 18 h, the ensuing phase is termed the larva stage. 28 At 48 h, there is a marked evolution in organ development. The exposed group, however, showed developmental lags and cells with tenuous connections.…”