R. Ondiba1*, E. Kembenya1, K. Obiero1, Z. Gichana2, K. Nyakeya3 and M. Onduma1
1Kenya Marine & Fisheries Research Institute (KMFRI), Sangoro Aquaculture Research Station, P.O Box 136-40111, P ap-Onditi, Kenya.
2University of Natural Resources and Life Sciences,
Gregor-Mendel-Straße 33/DG 1180 Vienna, Austria
3Kenya Marine & Fisheries & Fisheries Research Institute (KMFRI),
Baringo Station, P.O Box 36, Kampi ya Samaki, Kenya.
*Corresponding Author: firstname.lastname@example.org
Scarcity and costly aquafeeds are a setback to sustainable aquaculture in developing countries. Fishmeal (FM) which is preferred for fish feeds is costly and scarce due to competition from livestock and poultry feed industries. Though use of plant-based ingredients for fish feeds is a strategy to reduce the cost, demand for conventional ingredients such as soy, cottonseed among others, is as high as that of fishmeal. Therefore, it is necessary to explore use of non-conventional feedstuffs (NCPF) which are less costly, locally available and have good nutritional profiles. For instance, Prosopis juliflora seed meal (PSM) has crude protein (CP) ranging between 27-65.2%. The plant is abundant in arid and semi-arid areas and the seeds have successfully been included in Labeo rohita and Oreochromis niloticus diets, but not in Clarias gariepinus diets. In this study we evaluated the proximate composition of PSM and performance of C. gariepinus fed PSM based diets. Proximate composition of PSM was determined using standard methods. The test diets PSM0, PSM1, PSM2 and PSM3 were based on replacement of FM at 0, 15, 30 and 50%, respectively. A total of 12 hapas in a pond at KMFRI Sangoro were each stocked with 50 C. gariepinus fingerlings of average weight 1.9±0.8 gm. The diets were randomly administered to the hapas in triplicates, for 6 months. The fish were fed at 9am and 3pm daily at 10% body weight and sampled fortnightly, during which body weight and total length were measured. The CP for PSM was 42.5 ±1.07. One-Way ANOVA comparison of means indicated that fish fed control (PSM0) and PSM based diets had similar weights. Thus, there was no significant difference in growth for fish in all treatments. Therefore, PSM can replace FM up to 50% in C. gariepinus diets in a semi-intensive system without compromising growth.
Key words: Prosopis seed meal (PSM); Fishmeal (FM); Growth performance; Clarias gariepinus