International Journal of Oceanography & Aquaculture最新文献

{"title":"Effect of Phyto-Additive Allium Sativum in Feed on Survival Rate and Growth Performance of Post-Juvenile Clarias Gariepinus","authors":"Tagning Zebaze Pégis D","doi":"10.23880/ijoac-16000206","DOIUrl":"https://doi.org/10.23880/ijoac-16000206","url":null,"abstract":"The study on the effect of the incorporation of Allium sativum in feed on the survival rate and growth characteristics of postjuveniles of Clarias gariepinus, was carried out over 150 days at the Massoma fish farm located in the Douala 4th Subdivision, Cameroon (04° 03’- 04° 07’ LN and 09° 37’- 09° 41’ LE). The objective was to contribute to a better intensive production of Clarias gariepinus using feed additive. For this purpose, 750 post juveniles of C. gariepinus (375 males and 375 females) with a mean initial weight of 80 ± 1g and a mean total length of 22.51 ± 1.33 cm were divided into five batches, each representing a treatment and corresponding to a ration which was repeated 3 times. The rations noted R0 ; R3,5 ; R4 ; R4,5 and R5 respectively corresponded to incorporation rates of 0; 3.5; 4; 4.5 and 5% of Allium sativum in the feed. Fish were fed twice a day at 3% of the ichthyo biomass and readjusted each month after the control fishery. Following the latter, growth characteristics were also recorded each month. The results obtained were as follows: the survival rate varied from 72.00 ± 3.06 to 89.33 ± 3.79% with the highest value significantly (p<0.05) with the ration incorporated with 4.5% A. sativum. Regarding growth characteristics, they were significantly (p<0.05) affected by the incorporation rate of A. sativum. The highest average food consumption (793.55 ± 67.92g) was recorded with R5 and the lowest (603.74 ± 38.92g) with the R0 ration. The highest total length (43.42 cm) was obtained in males from the R5 treatment and the lowest (39.56 cm) with females fed with 0% A. sativum. The highest weight gain (715.60 ± 87.80g), mean daily gain (4.77 ± 0.59g) and specific growth rate (1.52 ± 0.07% g / d) were recorded in males with the R5 ration and the lowest in females fed with R0 . The highest K factor (0.97) was obtained in females of R3.5 and in both sexes of R4.5. The highest protein efficiency coefficient (1.92 ± 0.09) was observed in males from the R5 treatment and the most reliable (1.60 ± 0.20) with females from R0 . The lowest consumption index (1.18 ± 0.08) was recorded with the R5 ration and the highest (1.37 ± 0.17) with the R0 ration. This study reveals that the incorporation rate of 5% of A. sativum in the food of post juveniles of C. gariepinus is better on the survival rate and growth.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126054070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-Term Changes in Winter SST, Wind Stress and Anchovy Fishery in Relation to Climatic Indices along the South-Eastern Black Sea","authors":"E. Agirbas","doi":"10.23880/ijoac-16000226","DOIUrl":"https://doi.org/10.23880/ijoac-16000226","url":null,"abstract":"A 47-year time series of winter Sea Surface Temperature (SST), wind stress and anchovy landing data from 1970 to 2016 was examined to assess long-term changes in these variables along the south-eastern coasts of the Black Sea in relation to the North Atlantic Oscillation (NAO), East Atlantic West Russia (EAWR) and Atlantic Multi-Decadal Oscillation (AMO) indices. An increase in winter SST at a rate of 0.02°C (r = 0.60; p<0.001) was observed over the period. Cumulative sums of the SST anomalies showed that there was a decrease in winter SST from 1985 to 1999, followed by an increase in SST from 2000 to 2014. Wind stress decreased throughout the time series, and it was inversely correlated with winter SST. Significant correlations detected between winter SST, wind stress, anchovy landings and winter values of the climate indices suggested that climate change is causing a decline in anchovy along the south-eastern coasts of the Black Sea.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122522220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constructed Wetlands for Marine Aquaculture Wastewater Treatment: A New Challenge","authors":"L. M. Pérez","doi":"10.23880/ijoac-16000202","DOIUrl":"https://doi.org/10.23880/ijoac-16000202","url":null,"abstract":"Aquaculture is the fastest growing food production sector worldwide. Global demand for seafood continues to grow, and landbased aquaculture is expected to grow in order to meet the increasing market demand. In this context, marine aquaculture production systems are moving towards land-based farming. However, due to the large volumes of wastewater with high salinity and other fish-metabolism derived pollutants (e.g., nitrogen compounds), it remains a challenge for treatment of effluents from land-based marine aquaculture. In this scenario, development of environmental-friendly and efficient aquaculture effluent treatment system is crucial for sustainable intensification of aquaculture. Owing to low capital, operating costs, and low energy consumption, constructed wetlands (CWs) are becoming a promising technique to treat aquaculture effluents before discharge.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133514275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observation of Spatial and Temporal Distribution of Dissolved Oxygen and Detection of Oxygen Minimum Zones in the Bay of Bengal","authors":"M. Chowdhury","doi":"10.23880/ijoac-16000198","DOIUrl":"https://doi.org/10.23880/ijoac-16000198","url":null,"abstract":"The decrease in oxygen content (deoxygenation) of coastal and oceanic waters worldwide has found to be worsened in recent decades. Recent findings indicate that the Peru-Chile margins, West African coast, the northern Indian Ocean and Bay of Bengal are increasingly vulnerable to deoxygenation events. This study observed the distribution of dissolved oxygen (DO) and found the Oxygen Minimum Zones (OMZ) in the Bay of Bengal spatially and temporally. DO data was collected from the World Ocean Database for all the years the inventory has available. A permanent hypoxic condition at the mid-layer depths (200m -900m) was observed in the shallower area. During monsoon season, due to meteorological turmoil of cyclone genesis and heavy rainfall, the area get enough oxygen. The vertical distribution is found to be as decreasing at first few hundred depths and then increasing from 1,000m to the bed. The sections show OMZs more in summer and winter; less in monsoon. The OMZs lie mostly at 200-500m depth along the continental slope or at mid-regions of the basin.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133277413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Some Aspects of the Physicochemical Parameters of Surface Water in Kurudu Reservoir, Federal Capital Territory, Abuja Nigeria","authors":"I. S","doi":"10.23880/ijoac-16000215","DOIUrl":"https://doi.org/10.23880/ijoac-16000215","url":null,"abstract":"Assessment of some aspects of the physicochemical parameters of surface water in Kurudu Reservoir in Federal Capital Territory, Abuja, Nigeria was assessed from January 2018 to December 2019. The aim of this study was to determine some aspect of physicochemical parameter to determine water quality condition of the reservoirs for conservation, management and sustainable use of the reservoirs. Water Samples were collected from three sampling stations and analyzed using standard methods, procedures and instruments. The results of physico-chemical parameters in Kurudu reservoir had a range as shown; The temperature ranged from 23.8-32.3°C with a mean value of 26.0±1.9°C, the pH ranged from 6.3-7.9 with a mean value of 7.1±0.3, and the Secchi depth (transparency) ranged from 0.4-1.8m with a mean value of 1.2±0.4m. Turbidity ranged from 10.5-85.0 NTU with a mean value of 26.0±13.4 NTU. The electrical conductivity (EC) ranged from 59.8-257.0 S/cm with a mean of 105.4±31.9 S/cm, the dissolved oxygen ranged from 4.9-7.1 mg/l with a mean of 6.2±0.4 mg/l, and the biochemical oxygen demand (BOD) ranged from 5.0-8.0 mg/l with a mean of 5.7±0.6 mg/l. Nitrate levels ranged from 3.9-8.5 mg/l with a mean of 6.7±0.9 mg/l, Phosphate levels ranged from 0.0-0.2 mg/l with a mean of 0.1±0.0 mg/l, iron levels ranged from 0.0-1.6 mg/l with a mean of 0.1±0.0 mg/l, and lead (0.0-bdl). Mean values of physicochemical parameters were within the recommended WHO limits except for Turbidity and Nitrate. Analysis of variance (ANOVA) of mean physicochemical parameters between stations and months were not significantly different (P>0.05) as shown by the p-value in Table 2. However, ANOVA of seasonal mean values of turbidity, transparency, EC, Phosphate and Iron values were significantly different (P>0.05). Pearson’s correlation analysis is shown in Table 5. Temperature-transparency (r = 0.592), temperature-EC (r = 0.652), transparencyEC (r = 0.789), turbidity-BOD (r = 0.835) and turbidity- Fe2+ (r = 0.665) had a positive significant relationship whereas temperature-turbidity (r = -0.659), temperature-Fe2+(r = -0.758), temperature-PO4 (r = -0.537) transparency-turbidity (r = -0.938), transparency-BOD (r = -0.880), turbidity- Fe2+ (r = -0.513), turbidity-EC (r = -0.728), EC-Fe2+ (r = -0.547), DO-BOD (r = -0.547) and nitrate-phosphate (r = -0.804) had a negative significant relationship. Calculated water quality index using Horton’s method was 62.35, this study has shown that the reservoirs falls within “good/average” water quality, with class II level of pollution which is indicative of moderate pollution especially during the rainy season. Effective monitoring of reservoir and regulation of activities in and around the reservoir are recommended, also water from the reservoir should be treatment before consumption.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122838266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monthly and Spatial Distribution of Ocean Wave Parameters in the Bay of Bengal Using ERA5 Reanalysis Data","authors":"R. Ahamed","doi":"10.23880/ijoac-16000200","DOIUrl":"https://doi.org/10.23880/ijoac-16000200","url":null,"abstract":"The purpose of this study is to assess the spatial distribution of ocean wave parameters, and their correlation and anomalies in the Bay of Bengal (BoB) using about 40 years of ERA5 reanalysis data. Collected data were analyzed by using geographic information system (GIS) and computer programming languages. It is revealed that higher values of SWH (2.50–2.58m) dominated the central, southern and south-western BoB during June–August. The monthly climatological mean of MSS and Cd are ranged from 0–0.013 and 0.0006–0.0016 respectively in the study area. WSP were higher (10.31–10.84m/s) in southwestern BoB during June–August. Tm is higher (11.23–11.03s) during April–September in southern and south–eastern BoB. Lower Tm (2.36–2.73s) is found in western and eastern BoB. SWH, WSP, Tm, MSS and Cd have unfolded significant impact on each other during most of the month. Strong anomaly has been reflected in the SWH, WSP, and Tm during March–April.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123337063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mass Species of the Sea Star Asterina Pectinifera as a Potential Object of Mariculture","authors":"A. Drozdov","doi":"10.23880/ijoac-16000195","DOIUrl":"https://doi.org/10.23880/ijoac-16000195","url":null,"abstract":"Starfish Asterina (= Patiria) pectinifera) is widely distributed along the western coast of the Pacific Ocean from Sakhalin Island to the Yellow Sea. This is the most numerous species in the Peter the Great Bay of the Sea of Japan. Asterina tissues in large quantities contain a mixture of carotenoids, the most famous of which is astaxanthin. The developed technology of complex processing of A. pectinifera starfish allows to obtain biologically active collagen peptides and carotenoid preparations enriched with astaxanthin, exhibiting immunomodulatory, anti-inflammatory and antioxidant activities. They can be used as a raw material for obtaining new medicinal, cosmetic and food products.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127379879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of Astaxanthin Fed to Rainbow Trout (Oncorhynchus mykiss): Effect on Growth, Pigmentation and Blood Indices","authors":"ME Jalil Zorriehzahra","doi":"10.23880/ijoac-16000197","DOIUrl":"https://doi.org/10.23880/ijoac-16000197","url":null,"abstract":"In this study, the effect of astaxanthin on growth, pigmentation and blood factors were studied in rainbow trout weighted average (93±0.64 g) for 8 weeks. Two treatments and three replicates were employed as follows: Treatment A: fed with a commercial diet (control), treatment B: 41 mg/kg astaxanthin. All treatments were fed in hours 8, 12, 16, respectively. It should be considered that the feeding rate of biomass weight was examined after each took biometrics. Finally, blood samples were taken from the fish. The results revealed a significant difference between treatments in terms of weight and length (p<0.05) and no significant difference (p>0.05) in food intake and growth performance parameters, including FCR, SGR, GR, BWI%, and survival rate between treatments. In terms of pigmentation between experimental treatments, astaxanthin was created more change color than the control group. Results of blood factors showed that between WBC, RBC, Hb, HCT, Lymphocytes, Neutrophils, Monocytes and IgM were significant differences between treatments (p<0.05). So we can conclude that 41mg/kg astaxanthin dietary, due to economy, would be proper diet in the feeding of rainbow trout propagation.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134014281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring Strategy for Analyzing the Impacts of Coastal Finfish Aquaculture on Seafloor Sediments in Indonesia","authors":"Karl Heinz Runte","doi":"10.23880/ijoac-16000207","DOIUrl":"https://doi.org/10.23880/ijoac-16000207","url":null,"abstract":"This paper presents the development of a simple and generally applicable monitoring strategy for analyzing the environmental impacts of near shore finfish aquaculture in Indonesia. The proposed strategy has been tailored for remote aquaculture sites and primarily comprises sediment sampling, analysis of the chosen sediment indicators, and statistical analysis. The investigations were performed at a target aquaculture site in the northwest of Bali, Indonesia. On-site assessments were conducted for sediment quality underneath the largest fish farms accounting for 80% of the site´s production and at pristine reference locations. In this study, the effectiveness of several sediment indicators for monitoring benthic impacts was investigated. As total organic matter was found to be an effective indicator for the site in Indonesia which could be determined using a simple and inexpensive method, it was recommended for regular monitoring. The monitoring strategy was successfully integrated into a methodology under development at Germany to holistically estimate the carrying capacity of aquaculture sites. The effectiveness of the strategy in optimizing the relationship between the predicted carrying capacities of individual fish farms and the results of on-site assessments at the reference farms was demonstrated. From the analysis results, fish farms affecting the site in Bali were identified and recommendations made to ensure environmental sustainability. The proposed monitoring strategy has wide applicability and is currently being up scaled to several target aquaculture sites by the Indonesian government.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133095912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Challenge of Aquaculture in Bangladesh during CORONA 19","authors":"B. Chakraborty","doi":"10.23880/ijoac-16000223","DOIUrl":"https://doi.org/10.23880/ijoac-16000223","url":null,"abstract":"Data and information sources are used from the direct interview with individual, publication of the Department of Fisheries (DoF), internet and related non-published grey literature. The country has an inland water area of about 4.72mill.ha and about 710km long coastal belt. Fisheries sector contributes 3.57% to the national GDP, 25.30% to the agricultural GDP and more than 2.0% to the total export earnings. The target of fish production was crossed by producing 4.28 mill.mt fish in 2017-2018, whereas in 2017-18, inland culture fisheries contribute 56.0% to total fish production. This sector has been contributing about 60% animal protein in daily dietary requirement comes from fish, which is significant in food security through proving safe and quality animal protein. About 162.18 million (11%) people more than of total population are engaged with this sector on full and part time basis for their livelihoods. Bangladesh is blessed with an enriched aquatic diversity, comprising almost 260 freshwater fish species and 740 marine water fish species with other aquatic lives. But due to COVID 19 decline and degradation of wetland resources, the stock of inland capture fisheries has been reduced remarkably. In recent years, the fisheries sector is faced with challenges posed by numerous natural and anthropogenic causes such as climate change, natural disaster, environmental pollution, industrialization, overfishing, using destructive fishing gears, pesticide and agrochemicals and COVID 19. Very recently some important national program and biological management technology is developed for hilsha production, fish production and open water management to restrict the declination of resources and enhance production. But about 11% people are going to be jobless and maximum worker are workless in the country by affecting of COVID 19. The effect of COVID 19 is posing significant threat to the production, income, food security and livelihood of the population.","PeriodicalId":252910,"journal":{"name":"International Journal of Oceanography &amp; Aquaculture","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124833634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}