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Status of thukrinet fishery from Damb Fish Harbour, Sonmiani Balochistan coast, Pakistan
Get PDFThukri net is basically a bottom set drift net, widely operated for shrimp catching along the coastal waters of Sindh and Balochistan provinces, creeks of Indus delta, Sonmiani bay and nearby shallow coastal areas. The field investigation was done for two fishing seasons) from 15th August, 2008 to 15th April 2009, and from 15th August 2009 to 15th April 2010. The catch rate of shrimp varied from 0.50kg/net/day to 7.50kg/net/day.
Maximum catch 7.50kg/net/day was recorded in September 2008 and minimum 0.50kg/net/day in April 2009. The maximum catch of fishes (by-catches) was (3700kg/net/day) in September, 2008 and minimum was (12kg/net/day) in April, 2009. The average catch was 462.2kg/month and 4159.8kg/year in 2008-2009. The Thukri net catch of shrimp were about 779.40kg/boat/year and about 830kg/boat/year during 2008-2009 and 2009-2010 respectively and the finfishes were 4160kg/boat/year and 4779 kg/boat/year during the same period
SSF guidelines: The spirit of diversity
Get PDFA review of The Small-Scale Fisheries Guidelines: Global Implementation. Jentoft, S., Chuenpagdee, R., Barragán-Paladines, M.J., Franz, N. (Eds.) People, not profits, or even fish, are the fundamental feature of artisanal and small-scale fisheries throughout the world. This self-evident truth has for too long been absent in many policies dealing with fisheries or coastal management and development plans, to the detriment of not only people, but also ecosystems and the economic viability of what are critical industries at local and global scales
Effects of Yucca schidigera extract on the growth performance, feed efficiency, body composition of common carp (Cyprinus carpio, Linnaeus 1758) and culture water quality
Get PDFOne of the important goals in the aquaculture industry is to increase fish production with the least stress from ammonia secretion. Yucca plant (Yucca schidigera) was composed of steroidal saponins, polysaccharides, and polyphenols, which have increase the intestinal flora activity to improving the digestive process, also great absorption capacity for harmful volatile compounds, such as ammonia and hydrogen sulfide. Therefore, the aim of this study was to evaluate the effects of different Yucca schidigera extract levels on the Cyprinus carpio growth, feed performance, body composition and culture water quality for 60 days. Experimental treatments were designed which include: T1 (control without extracts), T2, T3 and T4 treatments (containing 0.5, 1 and 1.5% Yucca extract respectively). In a completely randomized design, 360 Common carp fish with weight of 2.40±0.04 g and length of 5.47±0.05 cm were reared in twelve 40-L plastic tanks. Different levels of extract were sprayed on commercial food and consumed at 4 times daily. There was significantly higher final body weights in T4 (p<0.05) compared with control (T1) and other experimental treatments (T2 and T3). Similarly, significantly better (p<0.05) feed conversion ratio (FCR), 2.01±0.37 and protein efficiency ratio (PER), 0.17±0.01 was noticed in T4 compared to control (FCR 2.71±0.31 and PER 0.14±0.01). The biochemical composition of carcass had a significant difference between treatments (p<0.05). The body chemical composition analysis showed that the low levels of crude protein and the high levels of crude lipids in T4 treatment were 62.87±2.63% and 26.29±1.55%, respectively. The physical and chemical parameters were within the recommended range for C.carpio. The experiment treatments had the lowest amount of ammonia and the highest amount of nitrate compared to the control treatment in culture water. The results of this experiment showed that the use of Yucca extract can improve the growth, feed performance, body composition and the water quality of the common carp culture system
Evaluation of dietary supplements of Pediococcus acidilactici bacteria and Agaricus bisporus mushroom powder on skin mucus immune indices of common carp (Cyprinus carpio) exposed to silver nano-particles
Get PDFThe purpose of this study was to investigate the effects of dietary supplements of Pediococcus acidilactici bacteria and Agaricus bisporus mushroom powder separate and combined (combined supplement) on the skin mucosal immune indices of common carp (Cyprinus carpio) in exposure to silver nano-particles. For this purpose, 180 fish with mean weight 29.6±0.4 g were fed in four treatments: bacteria (1 g/kg of diet), mushroom powder (10 g/kg of diet), combined bacteria and mushroom powder (1 and 10 g/kg of bacteria and mushroom) supplements and control (nutritionally non-supplemented) treatments and each treatment with 3 replicate (15 fish per replicate) for 60 days. After the end of the feeding period, the fish were exposed to sub-acute concentration of nano-silver (1 mg/l) for 14 days. Sampling of skin mucosa was performed to evaluate the immune-related parameters on days 1, 7 and 14 (5 sampling per replicate). Results showed that activity of lysozyme, alkaline phosphatase enzymes, soluble protein and total immunoglobulin in diets containing dietary supplements had a significant difference in nano exposed groups with control treatments (p<0.05) and had the highest amount on day 14. Also, although the control treatment had a 14-days incremental trend, it had the lowest levels than dietary supplement treatments. Combined food supplements, bacteria and mushroom powder showed the highest effects on mucosal immune parameters in exposure to nano-silver respectively
Effect of different salinity level on spawning, fertilization, hatching and survival of common carp, Cyprinus carpio (Linnaeus, 1758) in semi-artificial environment
Get PDFThe effects of various salinity levels among (0‰, 5‰, 10‰, 15‰, and 20‰) for successful breeding of common carp, Cyprinus carpio were investigated. The duration of study was 75 days. Ripe broodstock (30) having a mean weight (male 1027±2.4g and female 1084.8±23g) were selected and stocked into spawning tanks (2000 L). The ratio among male and female was 2:1. They were fed with commercial floating pelleted feed having 35% crude protein with 2% body weight twice a day. Broodstock were injected with ovaprim hormone 0.5 mg kg^-1 female and male 0.2 mg kg^-1 respectively, after successful spawning broodstock were removed from spawning tanks. The results showed that the highest fecundity, fertility, hatchability and survival of fry were obtained on salinity of 0‰ to 10‰ and significantly decreased on 15‰ and 20‰. The eggs per gram body weight were also recorded in all treatments and highest eggs were obtained, i.e. 45-60 per female on salinity of 0‰-10‰. Water temperature (22.4±0.2°C), dissolved oxygen (6.5±0.2 mg L^-1), pH (7.2±0.2) and ammonia (less than 0.03±0.06 mg L^-1) were monitored throughout the study period. Water quality parameters remained within the recommended range. Our results suggest that common carp, C. carpio may give maximum eggs up to 10 ‰ salinity with 81% survival of the fry
Identification of selected monogeneans using image processing, artificial neural network and K-nearest neighbor
Get PDFOver the last two decades, improvements in developing computational tools have made significant contributions to the classification of images of biological specimens to their corresponding species. These days, identification of biological species is much easier for taxonomists and even non-taxonomists due to the development of automated computer techniques and systems. In this study, we developed a fully automated identification model for monogenean images based on the shape characters of the haptoral organs of eight species: Sinodiplectanotrema malayanum, Diplectanum jaculator, Trianchoratus pahangensis, Trianchoratus lonianchoratus, Trianchoratus malayensis, Metahaliotrema ypsilocleithru, Metahaliotrema mizellei and Metahaliotrema similis. Linear Discriminant Analysis (LDA) method was used to reduce the dimension of extracted feature vectors which were then used in the classification with K-Nearest Neighbor (KNN) and Artificial Neural Network (ANN) classifiers for the identification of monogenean specimens of eight species. The need for the discovery of new characters for identification of species has been acknowledged for log by systematic parasitology. Using the overall form of anchors and bars for extraction of features led to acceptable results in automated classification of monogeneans. To date, this is the first fully automated identification model for monogeneans with an accuracy of 86.25% using KNN and 93.1% using ANN
The first report on epicardial cavernous hemangioma in farmed sturgeon, Acipenser baerii, a microscopic survey
Get PDFHaemangioma is a benign tumor of vascular endothelial cells or their progenitors. This tumor is common in dogs and rare in cats, horses and other domestic animals (Goldschmidt and Hendrick, 2002). In dogs, hemangiomas are typically benign and solitary those are often formed in the dermis of the skin, while hemangiosarcomas are regularly present as disseminated tumors that involve the spleen, heart, lung, liver, soft tissues of the trunk and extremities (Brown, 1985)
