Review Article
Feb 24, 2021
A good review describing a C-Type Lectin with Antibacterial Activity in Weather Loach.
Iceland has for a long time been renowned for its rich fishing grounds and prolific fisheries sector. Salmon sea fish farming in Iceland, as we know it today, is however a relatively young industry which goes back only few years. It has however, already experienced strong growth in investment, production, exports revenue and is a provider of employment in rural areas in Iceland. Operating licences issued for salmon farming in sea cages in Iceland, amount in total to less than 60 thousand tons. The four biggest companies in the industry which control nearly all of the operating licences issued in Iceland, are majority owned or fully owned by Norwegian investors and existing companies in the Norwegian salmon industry. With one or two exceptions, for some reason, companies in the Icelandic fisheries and fish processing sector, do not participate as investors and shareholders in the build-up of the salmon sea fish farming industry in Iceland, and therefore, have not added salmon into their fish production.
Review Article
Feb 24, 2021
A comprehensive review of the Macrophyte Diversity and the way it alters the Invertebrate Community ... and Fish Diet.
Iceland has for a long time been renowned for its rich fishing grounds and prolific fisheries sector. Salmon sea fish farming in Iceland, as we know it today, is however a relatively young industry which goes back only few years. It has however, already experienced strong growth in investment, production, exports revenue and is a provider of employment in rural areas in Iceland. Operating licences issued for salmon farming in sea cages in Iceland, amount in total to less than 60 thousand tons. The four biggest companies in the industry which control nearly all of the operating licences issued in Iceland, are majority owned or fully owned by Norwegian investors and existing companies in the Norwegian salmon industry. With one or two exceptions, for some reason, companies in the Icelandic fisheries and fish processing sector, do not participate as investors and shareholders in the build-up of the salmon sea fish farming industry in Iceland, and therefore, have not added salmon into their fish production.
Review Article
Feb 23, 2021
A good review of the Determinants of Climate Change Risk Management Strategies Among the Aquaculture ... Fish Farmers in Nigeria using Multinomial Logit Model.
Nigeria’s domestic supply of fishery products falls short of the demand; however, there is a growing aquaculture industry that has come to the rescue in filling the gap between supply and demand. The aquaculture fish farmers are prone to the risk of climate change, since weather and extreme events have become more unpredictable. This study assessed the climate change risk management strategies among the aquaculture fish farmers in Southwest Nigeria. Multi-stage sampling technique was used to select 480 aquaculture fish farmers in the study area. Descriptive statistics, likert scale and multinomial logit model were used to analyze the data. The study revealed that all the respondents were aware that climate is changing. The commonly used adaptation strategy by the fish farmers in the area was use of concrete /plastic pond (78%). The result of the multinomial logit model revealed that farm income influences the adoption of flood control/provision of water outlet by 19.22%, provision of alternative water supply (Well/Borehole) by 45.11% and the use of the concrete/plastic pond by 18.89%. Flood control/provision of water outlet, providing alternative water supply (Well/Borehole), use of concrete /plastic pond are all investment that were positively significant at 1%. Therefore, increase in farm income will lead to increase in these adaptation strategies to mitigate the effects of climate change on fish production in the study area. The study recommends that government at all levels should provide loan at a single digit interest rate to mitigate the effects of climate change on aquaculture fish farming.
Review Article
Feb 23, 2021
A short review of the Indigenous Fish Feed Resources in Nigeria.
Many unconventional sources are of very good nutrient profiles which when incorporated into feeds can meet parts of the protein and energy requirements of the fish. Most of these indigenous fish feed resources are non-competitive in terms of human consumption, their prices are relatively very low and sometimes are of no cost value. They are usually by- products or waste products from agricultural industries, domestic waste, and wild plants, thus their utilization as feed resources can help to reduce the cost of fish feeds and fish production in Nigeria.
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Research Article
Aug 05, 2020
Effect of Water Physico-Chemical Characteristics on Myxobolus tilapiae, A Myxosporean Parasite of T ... he Fish Oreochromis niloticus at MAPE Dam in Adamawa Region of Cameroon
The effect of water physico-chemical characteristics on Myxobolus tilapiae loads and prevalence was investigated from May 2016 to May 2017 in 350 specimens of Oreochromis niloticus captured in MAPE dam, Adamawa region of Cameroon. The spores load and the fish condition factor were negatively correlated (r=-0.37; P<0.05). No significant (P>0.05) correlation was observed between the prevalence of Myxobolus tilapiae and water temperature, pH and nitrate concentration. However, the prevalence was significantly and positively correlated with the carbonate hardness (r= +0.14; P<0.001), and negatively correlated (r=-0.17; P<0.001) with water transparency. The optimum characteristics of water regarding transparency and carbonate hardness for reduced M. tilapiae infection and O. niloticus productivity need to be determined.
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Research Article
Jul 31, 2020
Socio-Economic Condition and Livelihood Status of the Fisherman Community at Muradnagar Upazila in ... Cumilla
The present study become carried out to assess the socio-economic condition and livelihood structure of fishermen community at Muradnagar Upazila under Cumilla district during the period from February 2019 to July 2019. This Upazila is very close to Gumti River. Data were collected from randomly selected 40 respondents of local fishermen community through questionnaire interview. The study was performed on the basis of personal interview and Focus Group Discussion. From the survey, it was estimated that most of them are directly or indirectly involved in fishing. They are engaged in different fishing-related activities during banning season. The study shows that the majority (66%) of fishermen were Hindu, where 34% were Muslim. The literacy rate was only 18% here. The research indicates that 70% of fishers directly involved in fishing. They were provided license card from Upazila Fisheries Office. Their jointed family was 70%. Most of them live in a tin shed house which is 90%. The survey also informed that most of the fisher, like 80% use tube-well for drinking water. Treatment facilities were developed, but it depends upon their economic condition. Poor fishermen go to village doctor and kabiraj for treatment. Comparatively wealthy fishermen go to Upazila Health Complex and Sadar hospital in serious condition. In the study area, there were no training facilities for local fishermen. Sometime they could not get enough loans for lack of proper management program. As a result, fishers became helpless while flooding occurs. Electricity facilities in the study area were better than before. Annual incomes of the fishermen were varied from BDT 50000-100000. Except fishing, fishermen were involved in net making, boat construction, agricultural activities etc. The government should come forward to take necessary steps to manage their problems and to motivate them for creating significant opportunities for their better livelihood structures.
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Research Article
Jul 30, 2020
Some aspects of fish growth in Redbelly Tilapia (Coptodon zilli) and Largemouth Bass (Micropterus s ... almoides) in Lake Naivasha, Kenya
Coptodon zilli and Micropterus salmoides were introduced into Lake Naivasha in 1929 and 1959 respectively. The reasons for introduction were to boost the fisheries and for recreational fishing respectively. However, the numbers of the two fish species in the lake have been declining over the years due to human activities and other ecological changes within the lake. Length-weight relationship, condition factor, sex ratio and length at first maturity of the fish were studied from October 2016 to November 2018. A total of 303 fish samples; 193 C. zilli and 110 M. salmoides were used in this study. Results showed that C. zilli and M. salmoides had an allometry coefficient value of 2.9 and 3.1 and K value of 1.77 and 1.39 respectively. The sex ratios (male: male) of C. zilli and M. salmoides were 1.1: and 1.3:1 respectively. The shortest total length for mature C. zilli and M. salmoides recorded were 12 cm and 26.5 cm while 21.8 cm and 51 cm were for the longest respectively. The fish growth pattern therefore failed to obey the cube low of b=3 thus exhibiting allomentric growth. The fish were in good condition with K factor above 1. It can therefore be concluded that the fish are generally in a good condition though the early maturity especially for C. zilli could be a sign of pressure either from environmental factors or as a result of overfishing within the lake. Investigations should be centered on breeding and population dynamics to better understand the two species within the lake.
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Research Article
Jun 29, 2020
Formulated Feeds for Genetically Improved Farmed Tilapia (GIFT)
The problem in the development of Genetically Improved Tilapia brought about by the protein from the expensive fish feed is the surprising cost of fish feeds. The study's aim is to look for an alternative and cheap fish feed. The research identified Genetically Improved Farmed Tilapia (GIFT) growth and survival rates in the HAPA using formulated sweet potato granules and commercial feeds as the grounds for the development of a Technology Guide. The experiment method has been used in the research. Results: The findings showed that the three formulated feeds have lower protein (20.33, 19.3, and 19.6) yet with higher fat (24.1, 15.69, and 10.72) than the commercial (24.1%, 3%). The initial and final weight in grams, length in centimeters and width in centimeters were highest on T1 then followed by T2 and T3. It was with the use of T1 which proved to be an effective feed. Conclusion: The ingredients utilized in the feed formulations are possible substitution of fish feed and the advancement of its usage is commendable
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Research Article
Jun 29, 2020
Effects of Amino Acid Supplements in Plant-based Yellow Perch Diets
High protein distillers dried grains (HP-DDG) were tested in combination with fermented soybean meal (FSBM) or soy protein concentrate (SPC), with and without an essential amino acid complex, to assess utility of these plant protein alternatives in Yellow Perch Perca flavescens diets in a 63-d feeding trial. Four experimental diets were formulated to contain equal amounts of HP-DDG and FSBM or SPC, each with and without essential amino acids and compared to a fish meal/HP-DDG reference diet. Fish that received diets containing SPC displayed the greatest weight gain, feed conversion, and apparent protein digestibility. Weight gain was significantly reduced and feed conversion significantly increased in the diet containing FSBM without essential amino acids. No mortalities or health assessment differences were observed during the trial and all treatment fish readily accepted the experimental diets.
Research Article
Apr 22, 2020
Parasitological examination of Paramormyrops kingsleyae Günther, 1896 caught in the Djolon River in Cameroon revealed the presence of three new species of Myxosporidia of the genus Myxidium Bütschli 1882 and Henneguya Thelohan, 1892 of which complete description is given in the present study. These species are: Myxidium binguelai sp. nov., parasite of the kidney that produce fusiform spores with a turgid medial part and both ends pointed.They measured 12.1 (11.1-12.9) μm long x 5.3 (4.8-5.8) μm broad; the polar capsules are ovoid, equal in size and measure 3.6 (3.0-4.1) μm x 2.5 (2.0-2.8) μm. Myxidium djolonensis sp. nov., a parasite of the gall bladder and urinary bladder, produce fusiform and elongated spores, that measure 16.3 (15.5-18.0) μm long x 6.1 (5-7.1) μm broad; its polar capsules are equal and measure 4.9 (4-5.6) x 3.5 (3-4.2) μm. Henneguya paramormyropsi sp. nov. form cyst in gill,eye and kidney. The total spore length is 29.2 (25.5-32.5) μm. The ovoid spore body, with narrowed anterior end measure 11.9 (10.7-12.8) μm x 4.5 (3.9-5.9) μm. The two separate caudal appendages measure 17.3 (14-20.3) μm. The 2 equal-sized thin and smooth valves surrounded 2 equal-sized pyriform, elongate polar capsules (5 (4.2-5.6) ×1.5 (1.2-1.9) μm) that contained 3 to 4 coils of the filament.
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Research Article
Apr 22, 2020
Description of Three New Species of Myxosporidia (Cnidaria: Myxobolidae) Parasites of Paramormyrop ... s kingsleyae Günther, 1896 (Mormyridae) in the Nyong Basin in Cameroon
Parasitological examination of Paramormyrops kingsleyae Günther, 1896 caught in the Djolon River in Cameroon revealed the presence of three new species of Myxosporidia of the genus Myxidium Bütschli 1882 and Henneguya Thelohan, 1892 of which complete description is given in the present study. These species are: Myxidium binguelai sp. nov., parasite of the kidney that produce fusiform spores with a turgid medial part and both ends pointed. They measured 12.1 (11.1-12.9) µm long x 5.3 (4.8-5.8) µm broad; the polar capsules are ovoid, equal in size and measure 3.6 (3.0-4.1) µm x 2.5 (2.0-2.8) µm. Myxidium djolonensis sp. nov., a parasite of the gall bladder and urinary bladder, produce fusiform and elongated spores, that measure 16.3 (15.5-18.0) µm long x 6.1 (5-7.1) µm broad; its polar capsules are equal and measure 4.9 (4-5.6) x 3.5 (3-4.2) µm. Henneguya paramormyropsi sp. nov. form cyst in gill, eye and kidney. The total spore length is 29.2 (25.5-32.5) µm. The ovoid spore body, with narrowed anterior end measure 11.9 (10.7-12.8) µm x 4.5 (3.9-5.9) µm. The two separate caudal appendages measure 17.3 (14-20.3) µm. The 2 equal-sized thin and smooth valves surrounded 2 equal-sized pyriform, elongate polar capsules (5 (4.2-5.6) ×1.5 (1.2-1.9) µm) that contained 3 to 4 coils of the filament.
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Research Article
Feb 22, 2020
Phenotypic and Genetic Parameter Estimation for Growth Traits in Juvenile Large Yellow Croaker (La ... rimichthys crocea)
Heritabilities, as well as genetic and phenotypic correlations, were estimated for body weights (BW), body lengths (BL) and body heights (BH) in large yellow croaker, Larimichthys crocea. By crossing the Mindong and Daiqu strain, 60 fullsib families (offspring of 32 males and 60 females) were generated and reared separately. Environmental conditions of each family were standardised, and the body traits were recorded at six months of age. Heritabilities for the body traits were medium to high: 0.31 ± 0.06 for BW, 0.33 ± 0.06 for BL and 0.41 ± 0.07 for BH. The correlations among the three growth traits were positive and high in all cases, with the phenotypic correlations ranging from 0.84 to 0.91 and the genetic correlations ranging from 0.74 to 0.95. The results indicate that the growth traits of juvenile large yellow croaker could be improved efficiently by selection in a future breeding program.
Research Article
Nov 27, 2019
Shrimp is the most valuable fisheries resource in Mexico, representing almost 40% of the total production landed,with total revenue of more than US $ 132 million per year. Shrimp fishery provides with more than 30,000 direct and indirect jobs. Three peneid shrimp species, blue, brown, and white shrimp of the southern Gulf of California, are exploited near to their maximum capacity, and they account for >95% of the wild stock of the Pacific coast. In the current fishery, the age of first capture is the overexploiting juveniles; therefore, increasing the age of the first capture from four to five months is recommended. The stocks were evaluated with a simulation model. Two fishing scenarios were tested: the maximum sustainable yield (MSY) and the MSY/fisher. As it is not possible to address particular exploitation policies for each species, the recommended exploitation strategies are based on combined species. It was concluded that, for the MSY scenario, 12,000 fishing days per season would fulfill most of the requirements; in the second case (MSY/fisher), reducing the current number of boats to 530 would achieve the required goal.
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Research Article
Oct 28, 2019
The Salmon Sea Fish Farming Industry in Iceland A review
Iceland has for a long time been renowned for its rich fishing grounds and prolific fisheries sector. Salmon sea fish farming in Iceland, as we know it today, is however a relatively young industry which goes back only few years. It has however, already experienced strong growth in investment, production, exports revenue and is a provider of employment in rural areas in Iceland. Operating licences issued for salmon farming in sea cages in Iceland, amount in total to less than 60 thousand tons. The four biggest companies in the industry which control nearly all of the operating licences issued in Iceland, are majority owned or fully owned by Norwegian investors and existing companies in the Norwegian salmon industry. With one or two exceptions, for some reason, companies in the Icelandic fisheries and fish processing sector, do not participate as investors and shareholders in the build-up of the salmon sea fish farming industry in Iceland, and therefore, have not added salmon into their fish production.
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Research Article
Jun 10, 2019
Effects of Dietary Yeast Extract Levels on Growth Performance, Digestibility and Antioxidant Capaci ... ty of the Taiwan Loach
An 8-week feeding trial was conducted to determine the effects of different levels of dietary Yeast Extract (YE) on growth performance, digestibility and antioxidant capacity of the Taiwan loach. The trial contained 6 diets with different levels of wet YE, namely 0%, 1%, 2%, 3%, 4% and 5% (groups T1-T6). Each group contained 8 replicates with 12 loaches. Results indicated that the Specific Growth Rate (SGR) of loaches that were fed T5 diet were significantly higher than those of the other groups, whereas the feeding rate and feed conversion rate were just the opposite. The association of the regression analysis between different dietary YE and the loach SGR were: SGR=−9244YE3+622.03YE2-3.7768YE+3.9325(p<0.05). The apparent digestibility coefficient of the dry matter and the Amylase activity levels of the loaches fed with the YE were higher than those that were fed the T1 diet. The liver SOD activity was increased significantly following the increase in the YE supplementation (p<0.05). In conclusion, YE supplementation in the loach diet could promote growth, improve feed digestion and utilization, and enhance antioxidant capacity. The optimum levels of wet YE required for feeding the Taiwan loach species were estimated to 4.16%
