The present study describes the associated relationship between the length-weight, sex ratio and related condition factor of Tenualosa ilisha based on the length and weight data collected from the commercial landing station of BFDC, Cox’s Bazar, from January 2019 to December 2019. The work was carried out on 866 specimens (307 male and 559 female) ranging from 8.4 to 53.6 cm in length and weight of fishes ranging from 7 to 1977g, respectively. The reproductive attributes of T. ilisha appeared in the sex proportions (M: F=1:2) which revealed the prevalence of females in comparison with males. The external observation was taken into consideration to determine the gender of Hilsa. The relationship of length-weight was fitted with the pooled data for males and females independently of all month-to-month samples which results the BW=0.0104TL2.9795 (R2=0.9636) and BW=0.0019TL3.4689 (R2=0.8461) respectively. The results expressed a higher correlation in between the length-weight (r>0.91). The length wise relative condition factor of T. ilisha was estimated as 1.02, 0.9, 1.05, 1.03, and 1.02 at the length group of 0-20, 21-30, 31-40, 41-50, 51-60 respectively indicating fluctuation of condition factor within the size group. The overall KR for T. ilisha was 0.9-1.22 in which maximum KR was found in July while the minimum was in March. The KR was strongly correlated with TL and BW.
The study was conducted to assess the growth and production of rohu (Labeo rohita) in intensive aquaculture system in relation to feed conversion ratio (FCR). To assess the weight gain, SGR and FCR, the experiment was performed in six concrete tanks under a shed located on the southern th rd corner of Faculty of Fisheries, BAU for 100 days from 26 June to 3 September, 2018. Rohu fry was released at the rate of 4 fry per tank equivalent to the stocking density of 160 fishes/decimal for treatment 1 T and at the rate of 8 fry per tank equivalent to the stocking density of 320 fishes/decimal for treatment 1 2 T . Floating feeds were used for feeding the fish in both treatments. There were three (3) replications 2 for each treatment. During experimental period, feed was given at the rate of 12%, 8%, and 4% of the body weight in first 30 days, second 30 days and final 40 days, respectively. The weight gains of fish were 42.89±1.509 g and 23.49±4.039 g for T and T respectively. The mean percent weight gain of rohu 1 2, was higher in T (588.12±0.00) than T (319.29±0.00). Feed conversion ratio (FCR) in T and T were 1 2 1 2 2.21 and 2.99, respectively. The specific growth rate (SGR) of rohu in T and T were 1.92±0.275 and 1 2 1.43±0.108, respectively. The SGR for T was higher and FCR was lower in production cycle than T . 1 2 The total production was obtained 201.56±0.00 g in T and 248.08±0.00 g in T , respectively with 100% 1 2 survival rate in both the treatments.
The efficiency of feed is considered as one of the most crucial factors that affects the growth performance, feed conversion ratio and yield as well. The study was aimed to compare the growth parameters of tilapia at different stocking densities to detect the efficiency of sinking feed assessing the growth trends at various sampling stages. To evaluate the comparative yield, the study was carried out in twelve concrete tanks under an outdoor laboratory shed. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive and semi-intensive aquaculture system, respectively. To evaluate the growth trends sinking feed was used for feeding the fish during the experimental period for T1 (Intensive) and T2 (Semi-intensive), respectively. The feed was supplied in each with three replications at the rate of 20%, 15%, and 10% of the body weight of fish, respectively. The daily ration of feed was delivered to fish dividing into two parts daily. Aeration facilities using air stone aerator were installed for 24 hours. To assume the consecutive growth trends, weight of fish was recorded in 3 days interval to have better understanding on the yield performance in relation to the feed conversion ratio (FCR). Water quality parameters i.e., temperature and dissolved oxygen (DO) were recorded two times daily. The final weight gains of fish were 133.77±5.65 gm and 50.70±2.40 gm for T1 and T2, respectively. The mean percent weight gain of tilapia was higher in T1 (1127.25±0.00) than T2 (518.51±0.00 gm). Feed conversion ratio (FCR) in T1 and T2 were 1.97±0.11 and 1.70±0.07, respectively. The specific growth rates (SGR) of tilapia in T1 4.90±3.03 and 4.78±3.83 considering the data at the beginning and the end of the production cycle, respectively. Higher total production was obtained in T1 (1070.19 gm) than T2 (610.00 gm) with 100% survival in both the treatments. The present study reveals that, the efficiency of sinking feed was higher in T1 than T2 and farmers might be suggested to practice tank-based intensive aquaculture system to get higher production in a short period of time.
With a view to assess the growth variation of mono-sex Tilapia (Oreochromis niloticus) an experiment was carried out from 5 May 2016 to 4 th December 2016 in two different environmental conditions. Two locations were one in Mymensingh -Bhaluka and the other in Tangail -Modhupur. At each location, there were seven ponds of almost similar size (30 decimal) and water depth (1.5 m). The stocking density was 200 fry per decimal for each location. Pre-stocking and post-stocking management were similar in both locations. There were considerable variations in most of the water and soil qualities between two locations. After six months of rearing, significantly higher (p<0.05) mean harvesting weight of Oreochromis niloticus (500 ± 50g) was observed in Mymensingh, as compared to that of Tangail (350 ± 30 g).
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