Journal
WATER
Volume 13, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/w13223268
Keywords
Atlantic cod (Gadus morhua); Baltic Sea; biogenic reef; eelgrass; fish abundance; fish assemblage; fisheries management; flow velocity; restoration
Categories
Funding
- National Institute of Aquatic Resources (DTU Aqua) through a grant from the Danish Rod
- Net Fish License Funds
Ask authors/readers for more resources
Seagrass meadows and mussel reefs provide habitats for diverse fish species with similar species richness, but differences in fish assemblage structure and abundance exist between the two habitats, notably with higher abundance of Atlantic cod in low water current mussel reefs. This study highlights the importance of understanding fish assemblages in different habitats for conservation and restoration efforts in coastal fisheries and marine spatial planning.
Seagrass meadows and mussel reefs provide favorable habitats for many fish species, but few studies have compared the associated fish assemblages directly and examined the influence of environmental variables. Knowledge of fish assemblages associated with disparate habitats is needed for the conservation of coastal fisheries and marine spatial planning. Catch per unit effort data derived from fyke nets showed similar species richness and diversity in seagrass meadows and mussel reefs, suggesting that both habitats support elevated marine biodiversity of mobile fauna. However, it was shown that fish assemblage structure differed between those habitats, and also fish abundance in seagrass meadows was significantly higher than in mussel reefs by comparing the data with a multivariate extension of Generalized Linear Models (GLM). Furthermore, employing underwater video recordings to compare fish abundances in high and low water current speed mussel reefs with a Generalized Linear Mixed Model with negative binomial distribution, data revealed similar fish abundances (in terms of the MaxN metric) despite the variation in current speed, probably because the mussel formations provide sufficient shelter, even from high water currents. The commercially important species Atlantic cod (G. morhua), however, was significantly more abundant in the low water current mussel reef. Therefore, restoration efforts targeting G. morhua could benefit from restoring low current mussel reefs. Our study provides input for the conservation of coastal recreational and commercial fisheries, habitat restoration and marine spatial planning where certain habitats may be prioritized.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available