Journal of Fisheries (University of Rajshahi)
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Anaesthetic effects of different concentrations of sodium bicarbonate on common carp (Cyprinus carpio)
Get PDFSedation of fish before handling and transporting can help curtail undue stress that can affect their health. This study investigated the effectiveness of sodium bicarbonate (NaHCO3) utilised as an anaesthetic agent for common carp (Cyprinus carpio) with an average weight of 13.5 ± 0.55 g. The experimental fish were grouped and exposed to different concentrations at 0, 40, 45 and 50 g L–1 of NaHCO3 dissolved in water. Fishes were bath-immersed in different concentrations of NaHCO3 solution until such time that they became anesthetised. Results showed that induction time and recovery time increases with increasing NaHCO3 concentration. All fish reached complete anaesthesia in more than 3 minutes under a higher concentration of 50 g L–1. No mortality occurred under any of the concentrations tested. The most optimal concentration leading to complete anaesthesia in 2 minutes and recovery in less than 4 minutes was 45 g L–1. This study showed that NaHCO3 is a potential fish anaesthetic for the common carp
Sustainability of the hookah diving fishery in Turkey
Get PDFHookah diving is a traditional fishing method based on the hand collection of commercial benthic organisms. Fishers continue their profession without paying attention to their physical health and psychophysical fitness. Ignoring the diving safety and decompression rules underwater, using improvised diving systems, and economic concerns carry risks that can result in death. The long-term sustainability of work depends on nations’ ability to control fishing practices and promote good management. This study discusses the current situation of hookah divers in Turkey based on official statistics from the ministry and face-to-face interviews with hookah divers. The data were subjected to strengths, weaknesses, opportunities, and threats (SWOT) analysis and synthesised with the literature for strategic analysis. The sector’s contribution to the national economy, economic satisfaction of divers, and supporting rural employment were evaluated as strengths. Lack of expertise in the professional career and complex laws were identified as threats that require urgent solutions. Multidirectional national efforts are needed for sustainable fishing, including stakeholder networking, diving safety, hookah equipment, underwater fishing strategies, training curricula and professional career development. Our findings offer strategic and planning approaches for the sustainable development of hookah diving in Turkey
Occurrence record and range extension of Pomadasys andamanensis McKay & Satapoomin, 1994 (Heamulidae: Haemulinae) from Great Nicobar Island, India
Get PDFPresent study reports the occurrence of Andaman grunt, Pomadasys andamanensis McKay & Satapoomin, 1994 for the first time from Indian waters based on one specimen (standard length 156.27 mm) collected from Great Nicobar Island, Andaman and Nicobar Island. This finding represents a new addition to the grunt fish fauna of Andaman and Nicobar Island, India. The species is distinguished from its congeners by having four separated longitudinal black stripes on the dorsal half of the body. The detailed morphological features of P. andamanensis are provided and compared with its previous records. Description and figures of the species are provided herewith along the morphometric measurements and meristic counts
Identification of Perna viridis based on mitochondrial COI sequence
Get PDFThe Asian green mussel (Perna viridis), a bivalve species of high economic importance, is widely distributed in the Indo-Pacific region. Here, we aimed to investigate the P. viridis species from Pakistan, a biogeographic area where nearly no P. viridis species were genetically characterized using mitochondrial cytochrome C oxidase subunit I (COI) gene to correlate it with morphologically identified species of other countries. Our results of Basic Local Alignment search Tool (BLAST) analyses show 98.7% similarity with the partial sequences of P. viridis reported from India. This study confirmed the molecular identification of P. viridis for the first time from Karachi, Pakistan and this finding is important for further taxonomic identification
Production and economics of Gangetic mystus (Mystus cavasius) farming under different feed restriction periods in cages of floodplain ecosystem
Get PDFHigh feed cost is a major problem for the promotion of a nutrient rich fish like Gangetic mystus (Mystus cavasius) in cages under floodplain ecosystem. To address this problem, production and economics of cage farming of Gangetic mystus were evaluated under different feed restriction periods in Atrai River of Chalan Beel. Four feed restriction periods were tested in floating cages under four different treatments (T1-0 day i.e., regular feeding, T2-1 day, T3-2 days, and T4-3 days feed restriction per week). Fish were fed twice daily with commercial floating pellet containing 32% protein. Water quality parameters (water temperature, dissolved oxygen, pH and ammonia-nitrogen) were within the suitable range for fish culture. Final weight, weight gain, % weight gain, average daily gain, specific growth rate and survival rate were found significantly higher at treatment T1 whereas a better feed conversion ratio was observed in T2. Significantly higher fish production and benefit were also obtained from treatment T2. The present study concluded that Gangetic mystus with a stocking density of 50 fish m–3 fed with 32% protein containing feed maintaining 1 day feeding restriction per week are economically feasible for cage culture in running water
Traditional fishing methods practiced by Ao and Sumi tribes in Dikhu River of Nagaland, India
Get PDFTraditional fishing knowledge dates back to the early fish catching techniques passed down from forefathers in most of the Naga communities, Nagaland. Traditional fishing is mainly practiced for household consumption and is considered less intensive than industrial fishing practices, which can negatively impact riverine sustainability. However, there is a risk of loss of traditional knowledge in recent times. Hence, an effort was made to comprehend and document the indigenous traditional knowledge associated with fishing practices utilized by the Ao and Sumi tribal communities residing along the banks of Dikhu River. The diverse array of traditional fishing equipment and techniques employed has been categorised based on their specific functions, resulting in the documentation of three types of fishing gears, four fishing accessories, one fishing craft and three other types of fishing techniques. However, in some regions, use of detrimental fishing like dynamites and harsh chemicals were encountered. The results indicate that local fishers continue to rely on indigenous fishing practices for sustenance, and the majority of traditional fishing gears are constructed using locally available eco-friendly materials such as bamboo, wooden poles and cotton twine. The information obtained in this study can be preserved and implemented in contributing better resource management
Length-weight relationships and condition factor of Asian sheat catfish, Wallago attu (Bloch & Schneider, 1801) inhabiting different rivers of India
Get PDFWallago attu is a freshwater catfish and has been classified as ‘Vulnerable’ in Red Data List of threatened species by IUCN. Length-weight relationship (LWR) of wild populations helps in understanding the pattern of fish growth that could be useful in fisheries management. The current work was carried out to the LWR and condition factor (K) of W. attu collected from five rivers of India (Ganga, Yamuna, Hooghly, Gomti and Pampa). A total of 261 fish specimens were sampled for LWR study. The value of b for the population of river Gomti (t=1.0312), Ganga (t=1.4109) and Yamuna (t=0.3365) was not significantly different from isometric growth (b=3) in Pauly’s t-test whereas the populations of Hooghly (t=10.3609) and river Pampa (t=3.4593) were significantly different (p<0.001) indicating positive allometric growth in the fish of rivers Hooghly and Pampa. Linear plot of log a over b resulted in straight line showed strong relationship. Low K value (K<1) indicated the poor health conditions of the fish in all five rivers. This study would provide information regarding the status of LWRs of W. attu in five rivers of India that could serve as a baseline data for future sustainable management and conservation of this vulnerable fish
Record of zipper loach Paracanthocobitis mackenziei (Chaudhuri, 1910), an indigenous ornamental fish from West Bengal, India
Get PDFParacanthocobitis mackenziei (Chaudhuri, 1910) is an ornamental fish belonging to the family Nemachilidae, mainly reported from several localities in the Ganges River basin of Uttar Pradesh and Bihar in Northern India. During a study on indigenous ornamental fish diversity in Paschim Medinipur district, P. mackenziei has been recorded for the first-time from Kangsabati River basin. The specimens have been identified based on morphometric and meristematic craracteristics. This report is the extension of the distribution of the species up to the South-Western part of West Bengal
Activities of fisheries co-operative societies in India to boost up and optimise the resources and economy of farmers: a review
Get PDFFisheries within India have significant financial, nutritional and socio-economic development prospects. The country has a diversified natural fishery resource. Fishermen have continuously undertaken fisheries activity throughout the country over decades and fisheries co-operatives have now been developed for cumulative production and effective regulation of fishery activities. It was observed that there have been many inconsistencies, mostly in the management of fisheries co-operatives; a few were effectively handled under active supervision and government backing, whereas many co-operatives are facing various problems for their existence. Effective administration of fisherman's co-operatives is critical for increasing fishing productivity and the socio-economic growth of fishermen. Co-operatives can help fishermen develop their skills and gather information about technology, marketing, and management. Co-operatives can improve productivity, processing, storing and transportation capabilities while also meeting financial demands. As a result, co-operative organisations may contend with multinational corporations by integrating competent management abilities with co-operative power. To do this, a nationwide research project focusing on different elements of fisheries co-operatives is recommended. The need for appropriate policy implications for such sustainable management of fisheries co-operatives in accordance with current technical advancements in the sector of aquaculture, environmental degradation and global warming has been highlighted
Factors affecting abundance and primary productivity of phytoplankton in a wetland ecosystem of Bangladesh
Get PDFWetlands are the most productive, economically important and hydrologically variable ecosystems. In this study, the abundance of phytoplankton and its primary productivity were evaluated in Dingapota Haor of Bangladesh. A total of 41 phytoplankton genera belong to Chlorophyceae (15), Bacillariaophyceae (14), Cyanophyceae (8) and Euglenophyceae (4) were recorded whereas Bacillariaophyceae (37.02%) was the most dominant. The highest cell density (22.71×104 cell L–1) was recorded in pre-monsoon. Diversity indices were also significantly higher in pre-monsoon. The species diversity, evenness and richness varied from 2.51–3.79, 0.57–0.90 and 4.65–7.50 respectively. Difference in phytoplankton assemblage with an overall average dissimilarity value of 52.56 % was recorded. Cyclotella (3.60%), Bacillaria (3.13%), Volvox (2.95%), Spirulina (2.92%) and Euglena (2.88%) were the five most contributory species to the seasonal variation. Gross Primary Production, Net Primary Production and Community Respiration values ranged from 0.90–2.49, 0.68–1.60 and 0.35–0.89 mgCm–3day–1 respectively. Alkalinity and Chl-a showed significant positive correlation with GPP, NPP and CR. Pre-monsoon was the most productive phase whereas the monsoon season was the least productive. The current study produced valuable baseline data that will aid in the formulation of wetland conservation and management strategies