3 research outputs found
Monitoring of Harmful Algal Bloom (HAB) of Noctiluca scintillans (Macartney) along the Gulf of Mannar, India using in-situ and satellite observations and its impact on wild and maricultured finfishes
No full textIn the Gulf of Mannar, Noctiluca scintillans blooms have been observed three times in September 2019, September and October 2020, and October 2021. It was determined and measured how the bloom period affects ichthyo-diversity. Noctiluca cell density varied slightly from year to year, ranging from1.8433 × 103 cells/L to 1.3824 x 106cells/L. In surface and sea bottom waters, high ammonia levels and low dissolved oxygen levels were noted. During the bloom period a significant increase in chlorophyll concentration was found. The amount of chlorophyll in GOM was extremely high, according to remote sensing photos made using MODIS-Aqua 4 km data. Acute hypoxia caused the death of wild fish near coral reefs and also in fish reared in sea cages. The decay of the bloom resulted in significant ammonia production, a dramatic drop in the amount of dissolved oxygen in the water, and ultimately stress, shock, and mass mortality of fishes
Examination on the biological economics of inshore shore seine fishery: A case study from Dhanushkodi Island, Tamil Nadu
No full textShore seining at Dhanushkodi, Tamil Nadu was an age old practice and its approach to fish, fisheries and fishers were detailed in the present study. The entire beach seining was carried out on the sea grass meadows which forms the breeding and feeding grounds of commercially important fishes and in turn showed the over dominance of juveniles in the catch. Gonadal examination itemised that, the majority of the fishes were in immature and maturing stage of ovarian development. The economic evaluation of juveniles of six important fish species reported a total economic loss of about INR 44.64 crores during 2015-16 by shore seining at Dhanushkodi. The gross revenue of fish landed per day varies from Rs 300 to Rs 15,000 and average reported being Rs. 5000/day in one unit. A total of 22 to 24 fishers involved in the activity and the profit has to be distributed accordingly
Status and origin of Egyptian local rabbits in comparison with Spanish common rabbits using mitochondrial DNA sequence analysis
No full text[EN] Mitochondrial DNA (mtDNA) and cytochrome b (cyt b) gene sequences were used to determine the status of genetic diversity and phylogeny for 132 individuals from local rabbit breeds in Egypt and Spain. The Egyptian local rabbit breeds were Egyptian Red Baladi (ERB), Egyptian Black Baladi (EBB) and Egyptian Gabali Sinai (EGS). However, the Spanish local rabbit breed was Spanish common rabbit (SCR). Previous breeds were compared with European Wild Rabbit taken from Albacete, Spain (EWR). A total of 353 mutations, 290 polymorphic sites, 14 haplotypes, 0.06126 haplotype diversity and –1.900 (P<0.05) for Tajima’s D were defined in this study. Haplotype A mostly occurred in 83.3% of Egyptian rabbits and 11.7 % of EWR, while haplotype B occurred in 63.8% of Spanish rabbits and 36.2% of the EGS breed. A total of 47 domestic and wild Oryctolagus cuniculus published sequences were used to investigate the origin and relation among the rabbit breeds tested in this study. The most common haplotype (A) was combined with 44.7% of published sequences. However, haplotype B was combined with 8.5%. Haplotypes of Egyptian, SCR and EWR were scattered in cluster 1, while we found only one EGS haplotype with two haplotypes of EWR in cluster 2. Our results assumed that genetic diversity for ERB, EBB and SCR was very low. Egyptian breeds and SCR were introduced from European rabbits. We found that ERB and EBB belong to one breed.Emam, AM.; Afonso, S.; González-Redondo, P.; Mehaisen, G.; Azoz, A.; Ahmed, N.; Fernand, N. (2020). Status and origin of Egyptian local rabbits in comparison with Spanish common rabbits using mitochondrial DNA sequence analysis. World Rabbit Science. 28(2):93-102. https://doi.org/10.4995/wrs.2020.12219OJS93102282Abrantes J., Areal H., Esteves P.J. 2013. Insights into the European rabbit (Oryctolagus cuniculus) innate immune system: genetic diversity of the toll-like receptor 3(TLR3) in wild populations and domestic breeds. 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