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Climate change poses significant challenges to food security worldwide, particularly in the fisheries sector, where fish production is highly sensitive to climatic variables. This study investigates the long- and short-run impacts of climate change on fish production in four major fish-producing countries, China, India, Vietnam, and Bangladesh, using annual time-series data from 1990 to 2020. An Autoregressive Distributed Lag (ARDL) model was employed to examine long-run equilibrium relationships between climate factors (precipitation, minimum, mean, and maximum temperatures, and CO2 emissions) and total fish production, as well as adjustments to short-run deviations. The findings revealed distinct patterns across countries: CO2 emissions positively influenced long-term fish production in China, India, and Bangladesh, whereas precipitation boosted fish production in China and Bangladesh. In contrast, Vietnam showed no long-run equilibrium, indicating higher sensitivity to short-term climatic fluctuations. In the short run, CO2 emissions significantly enhanced fish production in Bangladesh, with regional temperature effects varying. The minimum temperature positively impacted long-term fish production in China but negatively affected it in Bangladesh. In Vietnam, an increase in the maximum temperature enhanced short-run production, whereas a decrease in the minimum temperature reduced it. This study examined the critical role of CO2 emissions, precipitation, and temperature in influencing fish production, offering key insights for policymakers to develop adaptive strategies for sustainable fish production amid climate change.

Listeria monocytogenes, an important foodborne pathogen, may be present in different kinds of food and in food processing environments where it can persist for a long time. In this study, 28 L. monocytogenes isolates from fish and fish manufactures were characterized by whole genome sequencing (WGS). Core genome multilocus sequence typing (cgMLST) analysis was applied to compare the present isolates with publicly available genomes of L. monocytogenes strains recovered worldwide from food and from humans with listeriosis. All but one (96.4%) of the examined isolates belonged to molecular serogroup IIa, and one isolate (3.6%) was classified to serogroup IVb. The isolates of group IIa were mainly of MLST sequence types ST121 (13 strains) and ST8 (four strains) whereas the isolate of serogroup IVb was classified to ST1. Strains of serogroup IIa were further subtyped into eight different sublineages with the most numerous being SL121 (13; 48.1% strains) which belonged to six cgMLST types. The majority of strains, irrespective of the genotypic subtype, had the same antimicrobial resistance profile. The cluster analysis identified several molecular clones typical for L. monocytogenes isolated from similar sources in other countries; however, novel molecular cgMLST types not present in the Listeria database were also identified.

The purpose of this study is to determine energy use patterns, evaluating the environmental impacts and economic evaluation of smoked fish production in the Guilan Province. The initial data were collected from seven smokehouses in the north of Iran through face-to-face questionnaire method, while the required data related to the background system were extracted from the Ecoinvent 2.2 database. The total input and output energy result showed the use is examined to be 98,143.29 and 60,048 MJ ton −1 , respectively. About 79.31% of this was generated by fish, 7.7% from electricity, and 6.7% from wood chip. Life cycle assessment results showed that fish and salt emissions have the most notable effects. Among damage categories, the largest emissions were related to human health (37.77%). Climate change (30.35%), resource (28.78%), and ecosystem quality (0.92%) are next phases. The rates of nonrenewable, fossil in CExD method calculated 35,426.61 MJ ton −1 . Economic analysis of production was carried out. Some economic indicators have been calculated, and the benefit to cost ratio was obtained as 3.09. Due to the justification of fisheries management, these issues merit further exploration.

IntroductionRice-fish farming can play an important role in increasing food production in less developed countries. The Lao People’s Democratic Republic (Laos) is one of the least developed countries in the world, and rice is the most important crop in Laos.MethodsThe present study conducted field surveys in 2022 in order to get a better understanding of the status of rice-fish production systems in mountainous areas in Northern Laos. Rice-fish farming was defined as one form of aquaculture in the present study, characterized by seed stocking and feed input. Rice field fisheries is mainly the harvesting of wild fish with no seed and feed input.ResultsWe found that rice-fish production systems, including both integrated rice-fish farming and rice field fisheries, are still in resources poor status with low input levels of fertilizer and chemicals. Rice-fish farms generally have higher intensification levels in rice farming than that rice field fisheries farms. Rice-fish farms generate significantly more value output of rice than that rice field fisheries farms. Overall, rice-fish farms use land and labor more efficiently and generate higher land and labor productivity measured in value output than rice field fisheries farms.DiscussionWe suggest that more rice field fisheries farms can be intensified with extra seed and feed input to move to rice-fish farming to produce more aquatic products and more value output with the same rice field areas in Northern Laos.

The fisheries sector is a cornerstone of Bangladesh's economy, contributing significantly to national gross domestic product (GDP) and export earnings. However, the production of other marine fish falls short of national expectations due to various reasons, such as overexploitation, destruction of habitat, pollution, climate change and increasing pressure of poor fishers. This study examines the relationships between marine fish production, and climatic and oceanographic variables along the Cox's Bazar coast in the Bay of Bengal (BoB). Utilizing marine fish production data collected from fish landing centre, and satellite remote sensing data, the study evaluates the relationship between marine fish landing of five different groups and climatic and oceanographic variables. Multiple linear regression (MLR) models were employed to assess these relationships flowing into key analytical steps. The analysis revealed that certain climatic and oceanographic variables, including monthly average precipitation (LnPrecep), relative humidity (LnRhdt), sea surface temperature (LnSST), chlorophyll‐A concentration (LnChl), salinity (LnSalinity) and dissolved oxygen (LnDo), have a combined explanatory power of 30.7, 46.10, 30.7, 40.4 and 24.0%, respectively, for the observed variability in monthly landing of five groups of marine fishes (hilsa, chanda, mackerel, rita and mixed) at Bangladesh Fisheries Development Corporation (BFDC)'s fish landing centre of Cox's Bazar. Additionally, these factors explain 38.8% of the variability in the total monthly landing of these five kinds of fishes combined. All the models were found to be statistically significant (p < 0.05). However, the relatively low R2 values indicate other unaccounted factors, such as human pressure, particularly the increasing fishing pressure exerted by poor fishers contributing to reduction of marine fish production. These results highlight the relationships of climatic and oceanographic variables, and the volume of fish landings, or marine fish production, in the BoB, emphasizing the need for further research that includes growing fishing pressure to support sustainable marine fisheries management.

Eutrophication and nutrient pollution is a serious problem in many fish aquaculture ponds, whose causes are often not well documented. The efficiency of using inputs for fish production in a hypereutrophic fishpond (Dehtář), was evaluated using organic carbon (OC), nitrogen (N) and phosphorus (P) balances and measurement of ecosystem metabolism rates in 2015. Primary production and feeds were the main inputs of OC and contributed 82% and 13% to the total OC input, respectively. Feeds and manure were the major inputs of nutrients and contributed 73% and 86% of the total inputs of N and P, respectively. Ecosystem respiration, accumulation in water and accumulation in sediment were the main fates of OC, N and P, respectively. They accounted for 79%, 52% and 61% of OC, N and P inputs. The efficiency of using OC, N and P inputs to produce fish biomass was very low and represented 0.9%, 25% and 23% of total OC, N, and P inputs, indicating an excessive phytoplankton production and overdosing of fish feeds and manure. Dehtář pond was slightly autotrophic and phosphorus availability did not limit the phytoplankton growth. The low efficiency of using inputs was attributed to the low digestibility of raw cereals grain used as feed and the inability of planktonic food webs to transfer the primary production to fish due to high predatory pressure of fish stock on zooplankton. The primary production is an important input of OC in semi-intensive fishponds and should be considered in evaluations of fish production efficiency. L'eutrophisation et la pollution par les nutriments constituent un grave problème dans de nombreux étangs piscicoles, dont les causes sont souvent mal documentées. L'efficacité de l'utilisation des intrants pour la production de poissons dans un étang hypertrophique (Dehtář) a été évaluée à l'aide des bilans du carbone organique (CO), de l'azote (N) et du phosphore (P) et de la mesure des taux du métabolisme des écosystèmes en 2015. La production primaire et les aliments pour animaux étaient les principaux intrants de CO et contribuaient respectivement à 82 % et 13 % de l'intrant total en CO. Les aliments du bétail et le fumier étaient les principaux intrants d'éléments nutritifs et contribuaient à 73 % et 86 % des intrants totaux d'azote et de phosphore, respectivement. La respiration de l'écosystème, l'accumulation dans l'eau et l'accumulation dans les sédiments étaient les principaux devenirs du CO, du N et du P, respectivement. Ils représentaient 79 %, 52 % et 61 % des intrants du CO, de l'azote et du phosphore. L'efficacité de l'utilisation des intrants de CO, N et P pour produire de la biomasse de poisson était très faible et représentait 0,9 %, 25 % et 23 % des intrants totaux de CO, N et P, ce qui indique une production excessive de phytoplancton et un surdosage des aliments pour poissons et du fumier. L'étang Dehtář était légèrement autotrophe et la disponibilité du phosphore n'a pas limité la croissance du phytoplancton. La faible efficacité de l'utilisation des intrants a été attribuée à la faible digestibilité des céréales brutes utilisées comme aliments pour animaux et à l'incapacité des réseaux alimentaires planctoniques à transférer la production primaire aux poissons en raison de la forte pression prédatrice des stocks de poissons sur le zooplancton. La production primaire est un intrant important du CO dans les étangs semi-intensifs et devrait être prise en compte dans les évaluations de l'efficacité de la production piscicole.

The research was carried out in October-November 2020 in the waters of the Pangkep Regency. The data collected consisted of primary and secondary data, using direct observation in the field. Tidal observations were carried out in every moon phase for 2 x 24 hours. I collected data on the type and number of catches in each month’s phase. Tidal analysis using the criminal method and descriptive analysis of the types and quantities of trap net fish production (kg) and (Rp). The full moon phase is the highest tide at 185 cm and the lowest at 42 cm. The average sea level (mean sea level) is 113.5 cm. Types of trap net catch based on the moon phase in the waters of Sergei District, Pangkep Regency, identified 13 types of catches. The highest amount of fish production was obtained by the full moon phase of 100 kg, followed by the 80 kg dead moon phase, 95 kg early quarter moon, and 65 kg final quarter moon phase.

Bangladesh ranks high among the world’s leading fish producing countries. However, there is need to consistently increase fish production for feeding the growing population as well as meeting global demand. Production and supply of quality fish seeds is the precondition for successful fish farming and production, which is often hindered by multitude of problems. The study was conducted to identify the problems affecting the hatchery owners in producing quality fish seeds and its associated factors. Empirical data were collected from 70 randomly selected hatchery owners in Mymensingh district of Bangladesh during March and April 2019 using a structured interview questionnaire. Both descriptive and inferential statistics, such as multiple linear regression models were used to analyze the data. Major findings indicate that most of the hatchery owners (98.6%) experienced medium extent of problems in fish seed production, followed by high extent of problems (1.4%). In general, problems associated with financial capital, such as lack of capital to pay electricity bills (PFS = 199 out of 210) and high cost of fish feeds (PFS = 196) were found important for the hatchery owners. On the contrary, lack of knowledge of optimum doses of hormones use (PFS = 59) in fish seed production was identified as the least important problem. Correlation analysis suggested that annual income, hatchery management experience, investment at the hatchery, organizational participation, extension media contact, and knowledge of hatchery management were significantly associated with problems in fish seeds production. Moreover, multiple linear regression identified that extension media contact and hatchery management knowledge were the highest contributing factors that can explain variation in the focus variable by 17.2% and 16.2%, respectively. The study identified some opportunities for policymakers to address the important factors for reducing problems in producing fish seeds. Moreover, frequent contact with the extension service providers and adequate training on hatchery management might be effective measures in minimizing problems of the hatchery owners in the study areas.

Aquaculture's pressure on forage fisheries remains hotly contested. This article reviews trends in fishmeal and fish oil use in industrial aquafeeds, showing reduced inclusion rates but greater total use associated with increased aquaculture production and demand for fish high in long-chain omega-3 oils. The ratio of wild fisheries inputs to farmed fish output has fallen to 0.63 for the aquaculture sector as a whole but remains as high as 5.0 for Atlantic salmon. Various plant- and animal-based alternatives are now used or available for industrial aquafeeds, depending on relative prices and consumer acceptance, and the outlook for single-cell organisms to replace fish oil is promising. With appropriate economic and regulatory incentives, the transition toward alternative feedstuffs could accelerate, paving the way for a consensus that aquaculture is aiding the ocean, not depleting it.