Global conservation body urges expanded species listings and stronger international cooperation ahead of CMS COP15 in Brazil. Declining fish populations, dams, pollution and climate change threaten river ecosystems and livelihoods worldwide.
By Salam Rajesh
Migratory freshwater fishes remain vastly under-represented in the CMS appendices despite facing severe declines and high extinction risk across the globe.
This critical assessment is the hard statement of the IUCN position paper of the fifteenth meeting of the Conference of the Parties (COP15) to the Convention on the Conservation of Migratory Species of Wild Animals (CMS) to be held from the 23rd to the 29th later this month at Campo Grande in Brazil.
The document (Doc.25.6.1) to be presented at COP15 and the Global Assessment of Migratory Freshwater Fishes underscores the urgent need to strengthen international cooperation and protection for migratory freshwater fish species globally.
Only a small fraction of known migratory freshwater fish species is currently covered by CMS listings, even as fish species worldwide face acute challenges with their habitats threatened by dams, pollution, water abstraction, climate change, overfishing and other undesired human interventions.
Highlighting this critical conservation gap, IUCN stresses that the CMS can help address these issues by expanding species listings and coordinated actions at basin scale across the seven continents.
On the basis of this urgency, IUCN called on all Parties to the Convention to support improved data, baselines and specified proposals targeted at enhancing freshwater fish inclusion and conservation under the Convention, thereto recognizing their essential roles for river ecosystem health, food security and livelihoods worldwide.
Stating its stand on the matter, IUCN committed to supporting CMS Parties with scientific data and advice on migratory freshwater fish species and their conservation.
Making its position clear on communities and livelihoods, IUCN said it strongly supported the proposal from the eighth meeting of the Sessional Committee of the Scientific Council (ScC-SC8) in establishing a dedicated working group that would deal with the strategic issues related to interactions between communities and the CMS listed species (in reference to: UNEP/CMS/COP15/Doc.28.4/Add.1).
IUCN suggested that COP15 needs to amend the text to specifically focus on issues related to ‘human–wildlife conflict and coexistence’ which are addressed by various CMS frameworks, where a multi-stakeholder working group is crucial in promoting alignment and coordination across these initiatives.
The suggestion further stressed that by leveraging the impartial support of the IUCN SSC (Species Survival Commission) Human–Wildlife Conflict & Coexistence Specialist Group, the proposed working group would help Parties prevent and mitigate the impacts of human–wildlife conflict on CMS-listed species while promoting coexistence.
On Transfrontier Conservation Areas, IUCN said it supported the adoption of the draft decisions on Transfrontier Conservation Areas for Migratory Species (COP15/Doc.28.3) and that it stood ready to assist Parties through its technical expertise and global experience in transboundary conservation.
This support is reflected in outcomes of the Forum event held at the 8th IUCN World Conservation Congress (October 2025) which produced the report “Transboundary Conservation Around the World: Ecologically and Culturally Well-connected Landscapes and Seascapes”.
The report highlighted two key priorities directly relevant to CMS implementation. These are: (1) Emphasize moving from planning to action, harmonizing laws and management across borders, integrating connectivity for all species and ecosystems, and applying conflict-sensitive strategies, and (2) Long-term funding and multi-sector collaboration critical for sustained success.
IUCN therefore encouraged Parties to advance practical, cooperative measures that would strengthen connectivity for migratory species across national boundaries.
Touching on the subject of light pollution, IUCN welcomed the CMS draft decision on light pollution (COP15/Doc.28.7) and said it supported its emphasis on consolidating and disseminating the CMS International Light Pollution Guidelines for Migratory Species.
The draft decision recognized light pollution as a growing, cross-sectoral threat to migratory species and ecosystems, reflecting a mature phase of CMS work in which the priority shifts from developing new guidance to scaling up implementation, outreach and uptake by Parties and stakeholders.
Welcoming the conclusion of the Scientific Council that no immediate amendments to the guidelines are required, IUCN suggested that efforts should focus on awareness-raising, capacity building, and integration into policy and planning processes.
An interesting aspect of its position paper is with reference to the conservation implications of animal culture and social complexity.
IUCN welcomed the document COP15/Doc.28.13 on Conservation Implication of Animal Culture and Social Complexity which recognized its alignment with IUCN Resolution 8.112 (2025) in planning for strengthening the preservation of biodiversity through the use of Longevity Conservation approaches to ensure naturally age-structured populations of species.
Scientific evidence demonstrates that older individuals in animal populations often perform disproportionately important ecological, demographic, and social roles, serving as repositories of ecological knowledge, behavioural traditions, and socially learned strategies that enhance survival, reproduction, and population resilience – concepts that closely linked to emerging global work on animal culture and social learning under CMS.
IUCN appreciated the positive dialogue with the CMS Secretariat on the topic of animal culture and social complexity.
In collaboration with the CMS Secretariat and the Chair of the CMS Expert Group on Animal Culture, and through the IUCN CEESP-SSC Conservation of Animal Culture Task Force, IUCN sought in advancing the integration of animal culture into conservation policy and practice.
Complementing CMS’s focus on migratory species, IUCN promoted a holistic approach across migratory and non-migratory species, inclusive of traditional knowledge and Indigenous perspectives.
IUCN’s push for protection of migratory freshwater fish species is viewed in perspective of the concerns on rapid depletion of wetlands due to the primary reason of human interference in many aspects including infrastructure developments and reclamation of wetlands for different activities, thereby threatening fish populations and their habitats.
Dams across rivers have long been one of the contentious reasons for depleting migratory freshwater fish fishes like salmon and trout, triggering extensive tension between developmental agencies and the IPLCs (Indigenous Peoples and Local Communities), primarily over resources and livelihoods.
In this scenario, an isolated State like Manipur in India’s far northeast is no exception with the contentious Ithai Barrage for the 105 megawatt Loktak hydroelectric power project disrupting migratory freshwater fish routes and causing species loss upstream of the barrage, a reason that is cited as inducing economic loss and threats to livelihoods for thousands of fishing families within the Manipur River basin.