Impact of climate change on the fishery of Indian mackerel (Rastrelliger kanagurta) along the Kerala coast off the southeastern Arabian Sea

Hussain, Sajna Valiyakath; Zacharia, P U; Joseph, Dhanya; Somasekharan, Akash; Rojith, G; Benny, S.; Ninan, Roshen G; Valappil, Sathianandan Thayyil

doi:10.1016/j.rsma.2021.101773

Cited by 3 publications

(3 citation statements)

References 41 publications

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“…Several studies have quantified the impacts of climate change on fisheries, revealing different magnitudes in different places and species. The catch potential of Indian mackerel for the period 2020-2100 under RCP6.0 will decline from 2035 (+14%) to 2100 (−44%) [ 26 ]. The predicted loss of the fishery sector in Guyana under A2 and B2 scenarios in 2050 are from 20 to 34 million USD at the discount rate of 1% per year [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Welfare impact of climate change on capture fisheries in Vietnam

Nguyen

2022

PLoS ONE

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Fisheries are forecasted to shrink in the tropics due to climate change. In Vietnam, fisheries are a pro-poor economic sector and essential nutrition source; however, welfares of producers and consumers in the climate change context are not well understood. While most studies focus on the gains or losses of total products and revenues, this paper pays additional attention to the changes in surpluses of market players in the long run. A combination of the production function, demand and supply functions, and partial equilibrium analysis is employed to measure the production and welfare impacts based on time series data from 1976 to 2018 and a Vietnam household living standards survey in 2018. The results show that relative to the present, catch yield is likely to reduce 35%-45% by mid-century and 45%-80% by the end of the century. Consumers may lose their surplus of 7-9 billion USD (PPP, 2018) by 2035 and 10-18 billion USD by 2065 due to supply reduction, while producers may gain additional profit of 3.5-4.5 billion USD by 2035 and 5-9 billion USD by 2065 owing to a price increase. The research findings suggest that Vietnam could impose measures to limit capture effort, as set out in the Law of Fisheries 2017, without harming fisher welfare. The expansion of aquaculture could reduce the gap between supply and demand of wild fish to mitigate consumer welfare loss; however, this impact is still ambiguous.

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Section: Introductionmentioning

confidence: 99%

Welfare impact of climate change on capture fisheries in Vietnam

Nguyen

2022

PLoS ONE

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“…The various mackerel species harvested by multiple gears such as seines (purse seines, boat seines, and shore seines), gill nets and trawls are valued both in the domestic and international markets. The stock delineation using truss morphometrics and the impact of climate variables on Indian mackerel fisheries was reported (Remya et al, 2014, Sajna et al, 2021.…”

Section: Mackerelsmentioning

confidence: 99%

Pelagic Fisheries of India – An overview

Prathibha Rohit,

E. M. Abdussamad,

A. Margaret Muthu Rethinam

et al. 2024

Indian J. Fish.

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The annual pelagic fish landings of the country comprising diverse species, increased from0.3 million t in 1950 to >3 million t in 2021, marking a tenfold increase. The pelagic resourcesconsistently constituted over half of the total marine fish landings. Major contributors tothe pelagic landings are sardines, mackerels, tunas, carangids, ribbonfishes, Bombayduck,codlets, billfishes and barracudas. The west coast of India accounts for 60% of total pelagiclandings with the south-west coast comprising of Kerala, Karnataka and Goa sustainingvast shoals of small pelagic fishes thriving in the nutrient-rich upwelled waters. The pelagicfishes play a crucial role in the marine ecosystem, functioning as both prey and predator.Furthermore, the small pelagic fishes serve as sources of protein-rich food for coastalpopulations, and the large pelagic species command lucrative market prices both in thedomestic and export markets. Continuous monitoring of the landings of pelagic fishes isessential for recommending suitable management plans for the optimal and sustainableexploitation of the available pelagic resources in Indian waters. This paper attempts toprovide an overview of the marine pelagic fisheries of India, based on analysis of the fishlandings data across various sectors spanning the period from 1985 to 2021. Keywords:Marine fish landings, Pelagic fishes, Sustainableexploitation, State-wise contribution, Trends

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“…Understanding sh reproductive characteristics is important for assessing their commercial potential and determining the abundance of spawning stock (Kjesbu et al 2009). Fisheries management faces localised variation in the shing intensity of R. kanagurta in different coastal areas (Ghosh et al 2016;Hussain et al 2021). A holistic knowledge based on biology, life history, and species behaviour is crucial in overcoming the population decline.…”

Section: Introductionmentioning

confidence: 99%

Assessment of temporal variations in growth and reproductive dynamics of Rastrelliger kanagurta (Cuvier, 1816), in Gawadar, Balochistan

Siddique,

Saddozai,

Khanoranga

et al. 2024

Preprint

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The study examined the growth and reproductive characteristics of Rastrelliger kanagurta, a commercially sold fish in Gawadar, Balochistan. A total of 600 samples were collected from 2017 to 2019. The growth, reproductive characteristics, and wellbeing were assessed using length-weight relationship, fecundity, gonadosomatic index (GSI), and condition factors. Water quality parameters were assessed to estimate temporal variations in the quality of water inhabiting R. kanagurta. The results of LWR indicated that fish showed positive allometric growth (b<3) in both years of study. The mean Fulton’s condition factor (kc) ranged from 1 to 1.33 (2017–2018) and from 1 to 1.34 (2018–2019), while the relative condition factor (kn) was equal to 1 during the study period. The mean fecundity was 51450.4 eggs (2017–2018) and 46671.1 eggs (2018–2019). The highest fecundity was seen in June and July, while the lowest fecundity was observed in February. The GSI values ranged from 2-31 to 12.87 (2017-2018) and from 1.03 to 9.47 (2018-2019), with two spawning seasons: the first occurs from March to August, and the second takes place from August to October, respectively. The analyzed water quality parameters expect DO were in the range acquired for the better growth of fish. A positive correlation was observed between fecundity, body length, weight, ovary weight, and water quality parameters. Temporal variations in the studied parameters were statistically non-significant (p<0.05) except temperature and DO. The conditional factors were greater than the well-being value of one. The results concluded that R. kanagurta had good habitat adaptation.

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Impact of climate change on the fishery of Indian mackerel (Rastrelliger kanagurta) along the Kerala coast off the southeastern Arabian Sea

Cited by 3 publications

References 41 publications

Welfare impact of climate change on capture fisheries in Vietnam

Welfare impact of climate change on capture fisheries in Vietnam

Pelagic Fisheries of India – An overview

Assessment of temporal variations in growth and reproductive dynamics of Rastrelliger kanagurta (Cuvier, 1816), in Gawadar, Balochistan

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