Declining grouper spawning aggregations in Western Province, Solomon Islands, signal the need for a modified management approach

Autor: Kevin L. Rhodes, Alec Hughes, John Howard Choat, Richard J. Hamilton
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Male
Sexual Reproduction
0106 biological sciences
Topography
Marine and Aquatic Sciences
01 natural sciences
Geographical locations
Medicine and Health Sciences
Marine Fish
Grouper
Islands
Multidisciplinary
geography.geographical_feature_category
biology
Coral Reefs
Reproduction
Eukaryota
Agriculture
Effective management
Coral reef
Geography
Vertebrates
Medicine
Female
Seasons
Approaches of management
Anatomy
Genital Anatomy
Research Article
Conservation of Natural Resources
Spawning
Science
Oceania
Fishing
Fisheries
Modes of Reproduction
Marine Biology
010603 evolutionary biology
Solomon Islands
medicine
Animals
Gonads
Landforms
Overfishing
010604 marine biology & hydrobiology
Reproductive System
Organisms
Biology and Life Sciences
Geomorphology
Seasonality
biology.organism_classification
medicine.disease
Perciformes
Fishery
Fish
Epinephelus polyphekadion
Earth Sciences
Reefs
Melanesia
People and places
Developmental Biology
Zdroj: PLoS ONE, Vol 15, Iss 3, p e0230485 (2020)
PLoS ONE
ISSN: 1932-6203
Popis: Globally, groupers (Epinephelidae) that form fish spawning aggregations (FSAs) are highly vulnerable to overfishing and often require site-specific approaches to management. Over 5-years (2009–2013), we conducted underwater visual censuses (UVC) at a well-known spawning site at Njari Island, Gizo, Western Province, Solomon Islands, that supports aggregations of squaretail coralgrouper (Plectropomus areolatus), camouflage grouper (Epinephelus polyphekadion) and brown-marbled grouper (E. fuscoguttatus). Findings show that while there were species-specific variations in the duration and timing of the spawning season, aggregation densities peaked from March to June, representing the main spawning season for all three species. For P. areolatus, gonad analysis from samples taken from 2008 to 2011 confirmed reproductive activity in support of density trends observed through UVC. Over the 5-year UVC monitoring period, FSA densities declined for P. areolatus and E. polyphekadion. Conversely, following the first year of monitoring, E. fuscoguttatus densities increased. These inter-specific differences may reflect variable responses to fishing as shown elsewhere, or for example, differences in recruitment success. In response to known declines in FSAs of these species, in 2018 the Solomon Islands government placed a nationwide ban on these species’ harvest and sale between October and January. As this study shows, this ban does not encompass the peak aggregation period at Njari and will offer limited protection to other FSAs of these species that are known to vary in reproductive seasonality across the Solomon Islands. A more biologically meaningful and practical management strategy would be to implement a nationwide ban on the harvest and sale of these groupers each month between full and new moons when these FSAs form consistently throughout the country. Since effective management of FSAs typically requires a combined approach, spatial management that protects both spawning sites and reproductive migratory corridors is warranted.
Databáze: OpenAIRE
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