Cannibalism, survival and growth performance of juvenile African catfish Clarias gariepinus in relation to photoperiod and 17β‐Oestradiol treatment

Abstract

Cultivation of African catfish Clarias gariepinus is an industry-based leading commodity and is growing rapidly in Indonesia. Increasing catfish production requires support from a continuous supply of high-quality fingerlings. The application of appropriate technology would be very beneficial in increasing productivity in catfish fingerling production, especially in overcoming the issue of cannibalism which contributes to more than 50% of juvenile African catfish mortality (Hecht & Appelbaum, 1988; Appelbaum & Van Damme, 1988).Cannibalism in catfish begins at three and a half days after they begin eating (at an average total length of 8 mm) and increases significantly when they approach an average length of 80 mm or 47 days after they begin eating (Adamek et al., 2011;Mukai et al., 2013).There are two types of cannibalism and both are the main function of the correlation between predator mouth width and prey head width. Type-I cannibalism occurs in juveniles measuring 8-45 mm

The Photoperiod Significantly Influences the Growth Rate, Digestive Efficiency, Immune Response, and Antioxidant Activities in the Juvenile Scalloped Spiny Lobster (Panulirus homarus)

“…Similarly, short photoperiods have been found to enhance growth in other species, such as the African catfish (Clarias gariepinus) [61], abalone (Haliotis discus hannai) [61,62], and largemouth bass (Micropterus salmoides) [36], all of which displayed improved growth rates under limited light conditions. These differences in photoperiod adaptation across species may be attributed to their unique species characteristics and ecological behaviors.…”