Effects of iso-nitrogenous fertilizers as nutrient sources on carp polyculture in Bangladesh

A 120-day long experiment was conducted to find out the effects of urea plus triple super phosphate (UT), cow manure (CM) and poultry manure (PM) having iso-nil:rogen content on pond productivity and fish yield. Three fertilizer treatments, with three replicates each, were randomly assigned into nine earthen ponds of 100 m2 each. The stocking fish were rohu (Labeo ruhita), catla ( Catla catla) and mrigal ( Cirrhinus mrigala) in each treatment pond at the rate of 10000/ha with the ratio of 1:1:1. All ponds were fertilized fortnightly at the rate of 125 kg/ha urea plus 100 kg TSP/ha, 7000 kg/ha cow manure and 3500 kg/ha poultry manure for the treatment of UT, CM and PM, respectively, having an iso-nitrogen content of 56 kg in each. Though the physicochemical water quality parameters were more or less similar in all treatment ponds, the chlorophyll-a content and abundance of total plankton were significantly higher (P < 0.05) in the ponds receiving the treatment PM. Final growth as well as per unit production of fish was significantly higher (p<O.OS) with the treatment of PM (2067 kg/ha/4 months) followed by UT (1639 kg/ha/4 months) and CM (1246 kg/ha/4 months). The overall results showed that the poultry manure proved to be superior to urea plus TSP and cow manure, even when nitrogen content is similar, in carp polyculture system under prevailing conditions

Relative abundance and growth of male and female Nemipterus furcosus population

A study was conducted to understand the relative abundance and growth of male and female Nemipterus furcosus population in the Pahang coastal water, Malaysia. The sampling was done monthly for a period of one year. A total of 1446 fish specimens were studied in this research. The results showed that male N. furcosus population was significantly more than female (p0.05). The condition factor (K) ranged from 1.2559 to 1.3917 for male while 1.2503 to 1.3926 for female N. furcosus. Overall, higher mean condition factor was observed in smaller fish of both sexes. This study is useful for policy makers and fishery biologists for sustainable fishery management in the Pahang coastal water, Malaysia

Effects of day and night on swimming, grazing and social behaviours of rohu Labeo rohita (Hamilton) and common carp Cyprinus carpio (L.) in simulated ponds.

Diel rhythmicity of grazing, swimming, resting and social interactions of rohu (Labeo rohita) (weight 66.5¿68.3 g) and common carp (Cyprinus carpio) (79.9¿82.0 g) were observed in 1 m2 simulated ponds using video images. Fish behaviour was monitored during a full 24-h period, starting at 08:00 hours with a 15-min recording, which was repeated every 3 h. Rohu spent more time grazing during the day than at night. Grazing activity peaked at the beginning and at the end of the day. Grazing and resting of rohu were negatively correlated. Common carp grazed day and night, showing no distinct grazing peak. Considering the grazing time of rohu and common carp, a feeding schedule with two feeding times at 07:30 and 16:30 hours might be appropriate for better food intake and conversion in rohu¿common carp polyculture system

Drivers of child and women dietary diversity: Empirical evidence from a peri-urban area of Bangladesh

Dietary diversity (DD) is considered an indicator of micronutrient adequacy for all age groups. An unbalanced diet that contains only one or two nutrient components can be fatal. Given that women make up half of our population and that children are a country's future, it is crucial to maintain the nutritional status of both groups. Thus, the current study was designed to analyze the factors affecting the dietary diversity of both children and women of the residents living in a manufacturing industry-dominated growing peri-urban area of Bangladesh, where an institutional huge vacuum exists, mainly due to administrative transition. We randomly selected 146 mothers who had at least one child between the ages of 6 and 59 months to participate in our data collection. To identify the factors that influence children's and women's dietary diversity, multinomial and binary logistic regression models were used, respectively. Results unearthed that the age of the children, maternal age, and maternal education significantly affect children's dietary diversity, while the mother's education level, as well as their access to and control over resources affect their own dietary diversity. The study concludes that education has multiple effects on women's and children's dietary diversity as it can help mothers to make decisions about how the distribution of time and resources should be prioritized. Again, greater access to and control over resources may enable mothers to take care of any urgent needs for their children. For a sustainable solution, the policy level needs to keep its eyes on the girls' quality education as potential future mothers. © 2024 The AuthorsOpen access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]