Climate change is expected to have many impacts on the oceans; one of them is where fish are located in the ocean. Ocean warming is expected to cause fish to shift to different locations that are cooler — generally toward the poles and into deeper waters. But not all fish are moving in the same directions and at the same speeds. This is changing what fish are eating and who are eating them.
Developing countries face decreases in both fisheries and agriculture production under climate change
The authors looked at how food production on land and in the sea will be threatened by climate change and what the future effects on biodiversity, livelihoods and food security will be. They adopted the human development index (HDI) — a global index of life expectancy, education and per capita income. They found that all of the low human development index countries will face declines in both agriculture and fisheries production by 2050.
The rapid development of fisheries in the 1950’s facilitated declines in predator biomass, overexploitation, collapse of fish stocks, and degradation of marine habitats. A new PLOS ONE paper investigates past changes in trophic functioning of marine ecosystems cause by human-induced changes in species assemblages by applying an ecosystem approach to fisheries.
Fish are expected to shrink in size by 20 to 30 per cent if ocean temperatures continue to climb due to climate change. A new study by researchers at the Nippon Foundation-UBC Nereus Program provides a deeper explanation of why fish are expected to decline in size.
The mesopelagic zone of the ocean, which includes the 200 to 1000 m below the ocean surface, is poorly understood. Our limited scope of understanding for these areas may become increasingly problematic, as they may be vulnerable to global issues such as climate warming, deoxygenation, acidification, commercial fishing, and seabed mining.
Pacific bluefin tuna are in trouble — they’re at just 2.6% of historic, pre-fishing levels. They have been overfished and this overfishing is still continuing. Due to this dire situation, proper management of the stocks is increasingly important, yet information of the fish’s life history and migration patterns is limited.
A new paper, ‘A rapid assessment of co-benefits and trade-offs among Sustainable Development Goals‘, has been published in Marine Policy and includes contributions from various Nereus affiliates. This study highlights how achieving SDG 14: Life Below Water targets contributes to the accomplishment of other SDGs
Coastal ecosystems are undergoing complex changes caused by both social and ecological drivers occurring at varying scales and speeds, which ultimately act as either risks or opportunities to coastal social-ecological systems. The assessment of adaptive capacity of coastal ecosystems is crucial in understanding the extent to which they will be able to accept and adapt to these social and biophysical drivers.
Developing nations, which have contributed little to the issue of climate change, are likely to experience reduced livelihood opportunities and emerging dietary nutrient deficiencies as a result of climate change impacts on fisheries.
Due to the expansion of fishing practices, fish catches have become stagnant at best while global fishing efforts continue to grow, ultimately creating major stresses on marine resources. Fisheries impacts on both coastal and deep-sea ecosystems are well understood and documented; however, the biological and ecological impacts of fishing on open-ocean systems are not well studied or documented.