Effect of inorganic fertilizer on the fish growth and production in polyculture system of Bangladesh

Abstract

Abstract:A study was carried out on the optimal dose of inorganic fertilizer used in carp polyculture system over a period of 10 months. Three treatments were assigned: without inorganic fertilizer, with the application of 100 kg/ha/month inorganic fertilizer and 150 kg/ha/month inorganic fertilizer as T1, T2 and T3, respectively. Each treatment had three replications. The selected indigenous carp species were Rui (Labeo rohita), Catla (Catla catla) and Mrigal (Cirrhinus mrigala), and exotic carp species were silver carp (Hypophthalamichthys molitrix), grass carp (Ctenopharyngodon idella), common carp (Cyprinus carpio) and thai sarpunti (Barbodes gonionotus). The average water area of the experimental ponds was 0.11± 0.01 ha and average depth of water in all ponds was 1.26 m. The treatments showed no effect on water temperature, dissolved oxygen, alkalinity and pH. The fish production was significantly higher (P>0.05) in both the treatments T2 and T3 than that of T1 where no inorganic fertilizer was used. But there was no significant difference between T2 and T3 and T2 was with lower dose inorganic fertilizer (100 kg/ha/month) than T3. Therefore, 100 kg/ha/month inorganic fertilizers may be suggested in carp polyculture system for better production.

Constraints and prospects of carp production in Rajshahi and Natore districts, Bangladesh

“…Over fertilization of pond, especially with organic fertilizers, was responsible for this and this problem was common in winter season. This result was similar to Sayeed et al (2007) who mentioned that fish farmers use fertilizers at different doses, sometimes three to four times more than that of standard dose.…”

“…Present findings are similar to the findings of Alam (2005). Sayeed et al (2007) mentioned that our farmers do not have enough money to invest in aquaculture.…”

“…The minimum, maximum and mean (±SD) fish production was found 2017.65, 5458.88 and 3598.72±785.83 kg/ha/yr respectively. According to Sayeed et al (2007), fish production can be increased up to 5000 kg/ha by feeding and fertilization which is much higher than that of the mean production. This indicates that there is enough scope of increasing the existing production.…”

Effect of feed, manure and their combination on the growth of Cyprinus carpio (L.) fry and fingerlings

“…Fertilization and supplemental feeding are the two important management measures adopted in the semi-intensive system of carp and Tilapia culture in Egypt. Several studies focus on the role of fertilizers in fish production (Garg and Bhatnagar, 2000;Dhawan and Kaur, 2002;Das et al, 2005;Sayeed et al, 2007;Bwala and Omoregie, 2009;Hussein, 2009;Ponce Palafox, 2010. Priyadarshini1 et al, 2011 and of supplemental feed in systems receiving fertilizers (Aziz et al, 2002;Virk and Saxena, 2003;Ahmed etal., 2005;Waidbacher et al, 2006;Elnady et al, 2010).…”

Comparative evaluation of two iso-nutritional feeds (mash and pellet) upon the environmental health and growth potential of two Indian major carps (Rohu, Labeo rohita; Mrigal, Cirrhinus mrigala) under mixed culture condition

“…Organic manures and agricultural by-products are extensively used which stimulate the growth of natural food by providing essential elements to increase the planktonic biomass. Besides, fertilization stimulates both the autotrophic and heterotrophic levels which increase fish production [3] by increasing primary production, dissolved oxygen, pH and total phosphorus [4]. In recent times, application of processed supplementary feed in the form of pellet is gaining momentum replacing the traditional mash type feed in the polyculture ponds where carps of different ecological and feeding niches are co-stocked for optimal use of the resources of the system.…”