Population structure of the brown-banded bamboo shark, Chiloscyllium punctatum and its relation to fisheries management in the Indo-Malay region

Understanding the factors generating patterns of genetic diversity is critical to implementing robust conservation and management strategies for exploited marine species. Yet, often too little is known about population structure to properly tailor management schemes. Here we report evidence of substantial population structure in white hake ( Urophycis tenuis ) in the Northwest Atlantic, perhaps among the highest levels of population structure exhibited by a highly exploited, widely dispersed, long-lived marine fish. We show that depth plays a role in this extensive and temporally stable structure, which does not conform to previously established fisheries management units. Three genetically distinguishable populations were identified, where all straddle several management divisions and two (Southern Gulf of St. Lawrence and Scotian Shelf) overlap in their range, coexisting within a single division. The most highly exploited population in the Southern Gulf of St. Lawrence was also the most isolated and likely the smallest (genetically effective). This work shows that conservation and management priorities must include population structure and stability in establishing effective species recovery strategies.

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Reproductive biology of a bamboo shark as a framework for better fisheries management

Marine and Freshwater Research ◽

10.1071/mf20189 ◽

2021 ◽

Author(s):

Fahmi ◽

Selvia Oktaviyani ◽

Michael B. Bennett ◽

Christine L. Dudgeon ◽

Ian R. Tibbetts

Keyword(s):

Reproductive Biology ◽

Fisheries Management ◽

Bamboo Shark

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Brown banded bamboo shark (Chiloscyllium punctatum) shows high genetic diversity and differentiation in Malaysian waters

Scientific Reports ◽

10.1038/s41598-021-94257-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Kean Chong Lim ◽

Amy Yee-Hui Then ◽

Alison Kim Shan Wee ◽

Ahemad Sade ◽

Richard Rumpet ◽

...

Keyword(s):

Genetic Diversity ◽

Mitochondrial Dna ◽

Population Structure ◽

Genetic Structure ◽

Genetic Differentiation ◽

Fishery Management ◽

Peninsular Malaysia ◽

Fine Scale ◽

Nadh Dehydrogenase Subunit 2 ◽

Bamboo Shark

AbstractThe demersal brown banded bamboo shark Chiloscyllium punctatum is a major component of sharks landed in Malaysia. However, little is known about their population structure and the effect of high fishing pressure on these weak swimming sharks. Both mitochondrial DNA control region (1072 bp) and NADH dehydrogenase subunit 2 (1044 bp) were used to elucidate the genetic structure and connectivity of C. punctatum among five major areas within the Sundaland region. Our findings revealed (i) strong genetic structure with little present day mixing between the major areas, (ii) high intra-population genetic diversity with unique haplotypes, (iii) significant correlation between genetic differentiation and geographical distance coupled with detectable presence of fine scale geographical barriers (i.e. the South China Sea), (iv) historical directional gene flow from the east coast of Peninsular Malaysia towards the west coast and Borneo, and (v) no detectable genetic differentiation along the coastline of east Peninsular Malaysia. Genetic patterns inferred from the mitochondrial DNA loci were consistent with the strong coastal shelf association in this species, the presence of contemporary barriers shaped by benthic features, and limited current-driven egg dispersal. Fine scale population structure of C. punctatum highlights the need to improve genetic understanding for fishery management and conservation of other small-sized sharks.

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Genetic population structure of the Blackspot seabream (Pagellus bogaraveo): contribution of mtDNA control region to fisheries management

Mitochondrial DNA Part A ◽

10.1080/24701394.2021.1882445 ◽

2021 ◽

pp. 1-5

Author(s):

Joana I. Robalo ◽

Inês Farias ◽

Sara M. Francisco ◽

Karen Avellaneda ◽

Rita Castilho ◽

...

Keyword(s):

Population Structure ◽

Control Region ◽

Fisheries Management ◽

Mtdna Control Region ◽

Genetic Population Structure ◽

Genetic Population ◽

Pagellus Bogaraveo

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Lessons learned from practical approaches to reconcile mismatches between biological population structure and stock units of marine fish

ICES Journal of Marine Science ◽

10.1093/icesjms/fsw188 ◽

2016 ◽

Vol 74 (6) ◽

pp. 1708-1722 ◽

Cited By ~ 57

Author(s):

Lisa A. Kerr ◽

Niels T. Hintzen ◽

Steven X. Cadrin ◽

Lotte Worsøe Clausen ◽

Mark Dickey-Collas ◽

...

Keyword(s):

Population Structure ◽

Spatial Structure ◽

Fisheries Management ◽

Marine Fish ◽

Stock Assessment ◽

Lessons Learned ◽

Composition Analysis ◽

Stock Identification ◽

Vital Rates ◽

Identification Methods

Abstract Recent advances in the application of stock identification methods have revealed inconsistencies between the spatial structure of biological populations and the definition of stock units used in assessment and management. From a fisheries management perspective, stocks are typically assumed to be discrete units with homogeneous vital rates that can be exploited independently of each other. However, the unit stock assumption is often violated leading to spatial mismatches that can bias stock assessment and impede sustainable fisheries management. The primary ecological concern is the potential for overexploitation of unique spawning components, which can lead to loss of productivity and reduced biodiversity along with destabilization of local and regional stock dynamics. Furthermore, ignoring complex population structure and stock connectivity can lead to misperception of the magnitude of fish productivity, which can translate to suboptimal utilization of the resource. We describe approaches that are currently being applied to improve the assessment and management process for marine fish in situations where complex spatial structure has led to an observed mismatch between the scale of biological populations and spatially-defined stock units. The approaches include: (i) status quo management, (ii) “weakest link” management, (iii) spatial and temporal closures, (iv) stock composition analysis, and (v) alteration of stock boundaries. We highlight case studies in the North Atlantic that illustrate each approach and synthesize the lessons learned from these real-world applications. Alignment of biological and management units requires continual monitoring through the application of stock identification methods in conjunction with responsive management to preserve biocomplexity and the natural stability and resilience of fish species.

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Global population structure and life history traits in the Galapagos Marine Reserve of wahoo (Acanthocybium solandri): Implications for fisheries management

10.14264/uql.2019.519 ◽

2019 ◽

Author(s):

Maria Haro

Keyword(s):

Population Structure ◽

Life History ◽

Fisheries Management ◽

Life History Traits ◽

Marine Reserve ◽

Galapagos Marine Reserve ◽

Global Population

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Fine-scale population structure and evidence for local adaptation in Australian giant black tiger shrimp (Penaeus monodon) using SNP analysis

BMC Genomics ◽

10.1186/s12864-020-07084-x ◽

2020 ◽

Vol 21 (1) ◽

Author(s):

Nga T. T. Vu ◽

Kyall R. Zenger ◽

Jarrod L. Guppy ◽

Melony J. Sellars ◽

Catarina N. S. Silva ◽

...

Keyword(s):

Population Structure ◽

Environmental Factors ◽

Fisheries Management ◽

Penaeus Monodon ◽

Genetic Connectivity ◽

Snp Analysis ◽

Sustainable Fisheries ◽

Black Tiger Shrimp ◽

Tiger Shrimp ◽

Improvement Programs

Abstract Background Restrictions to gene flow, genetic drift, and divergent selection associated with different environments are significant drivers of genetic differentiation. The black tiger shrimp (Penaeus monodon), is widely distributed throughout the Indian and Pacific Oceans including along the western, northern and eastern coastline of Australia, where it is an important aquaculture and fishery species. Understanding the genetic structure and the influence of environmental factors leading to adaptive differences among populations of this species is important for farm genetic improvement programs and sustainable fisheries management. Results Based on 278 individuals obtained from seven geographically disparate Australian locations, 10,624 high-quality SNP loci were used to characterize genetic diversity, population structure, genetic connectivity, and adaptive divergence. Significant population structure and differentiation were revealed among wild populations (average FST = 0.001–0.107; p < 0.05). Eighty-nine putatively outlier SNPs were identified to be potentially associated with environmental variables by using both population differentiation (BayeScan and PCAdapt) and environmental association (redundancy analysis and latent factor mixed model) analysis methods. Clear population structure with similar spatial patterns were observed in both neutral and outlier markers with three genetically distinct groups identified (north Queensland, Northern Territory, and Western Australia). Redundancy, partial redundancy, and multiple regression on distance matrices analyses revealed that both geographical distance and environmental factors interact to generate the structure observed across Australian P. monodon populations. Conclusion This study provides new insights on genetic population structure of Australian P. monodon in the face of environmental changes, which can be used to advance sustainable fisheries management and aquaculture breeding programs.

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