Juvenile fish habitat across the inner Danish waters: Using otolith chemistry to discriminate between hybridising con-familials and contiguous, coastal habitat

2019 ◽  
Vol 220 ◽  
pp. 111-119 ◽  
Author(s):  
Elliot J. Brown ◽  
Patrick Reis-Santos ◽  
Bronwyn M. Gillanders ◽  
Josianne G. Støttrup
Keyword(s):  
Fish Habitat ◽  
Juvenile Fish ◽  
Otolith Chemistry ◽  
Coastal Habitat

Consistency of patterns between laboratory experiments and field collected fish in otolith chemistry: an example and applications for salinity reconstructions

2005 ◽  
Vol 56 (5) ◽  
pp. 609 ◽  
Author(s):  
T. S. Elsdon ◽  
B. M. Gillanders
Keyword(s):  
Environmental Variables ◽  
Laboratory Experiments ◽  
Juvenile Fish ◽  
Otolith Chemistry ◽  
Ambient Water ◽  
Elemental Concentrations ◽  
Adequate Knowledge ◽  
Black Bream ◽  
Environmental Histories ◽  
The Relationship

Elemental concentrations within fish otoliths can track movements and migrations of fish through gradients of environmental variables. Tracking the movements of fish relies on establishing links between environmental variables and otolith chemistry, with links commonly made using laboratory experiments that rear juvenile fish. However, laboratory experiments done on juvenile fish may not accurately reflect changes in wild fish, particularly adults. We tested the hypotheses that: (1) the relationship between ambient (water) and otolith chemistry is similar between laboratory-reared black bream (Acanthopagrus butcheri) and wild black bream; and (2) ontogeny does not influence otolith chemistry. Field-collected and laboratory-reared fish showed similar effects of ambient strontium : calcium (Sr : Ca) on otolith Sr : Ca concentrations. However, ambient and otolith barium : calcium concentrations (Ba : Ca) differed slightly between laboratory-reared and field-collected fish. Importantly, fish reared in stable environmental variables showed no influence of ontogeny on Sr : Ca or Ba : Ca concentrations. Natural distributions of ambient Sr : Ca showed no clear relationship to salinity, yet, ambient Ba : Ca was inversely related to salinity. The distribution of ambient Sr : Ca and Ba : Ca in estuaries inhabited by black bream, suggest that these elements can answer different questions regarding environmental histories of fish. Reconstructing salinity histories of black bream using otolith Ba : Ca concentrations seems plausible, if adequate knowledge of Ba : Ca gradients within estuaries is obtained.

Can otolith chemistry be used for identifying essential seagrass habitats for juvenile spotted seatrout, Cynoscion nebulosus, in Chesapeake Bay?

2005 ◽  
Vol 56 (5) ◽  
pp. 645 ◽  
Author(s):  
Emmanis Dorval ◽  
Cynthia M. Jones ◽  
Robyn Hannigan ◽  
Jacques van Montfrans
Keyword(s):  
Trace Elements ◽  
Chesapeake Bay ◽  
Classification Accuracy ◽  
Spatial Scales ◽  
Juvenile Fish ◽  
Spotted Seatrout ◽  
Otolith Chemistry ◽  
Seagrass Beds ◽  
Cynoscion Nebulosus ◽  
High Classification Accuracy

We investigated the variability of otolith chemistry in juvenile spotted seatrout from Chesapeake Bay seagrass habitats in 1998 and 2001, to assess whether otolith elemental and isotopic composition could be used to identify the most essential seagrass habitats for those juvenile fish. Otolith chemistry (Ca, Mn, Sr, Ba, and La; δ13C, δ18O) of juvenile fish collected in the five major seagrass habitats (Potomac, Rappahannock, York, Island, and Pocomoke Sound) showed significant variability within and between years. Although the ability of trace elements to allocate individual fish may vary between years, in combination with stable isotopes, they achieve high classification accuracy averaging 80–82% in the Pocomoke Sound and the Island, and 95–100% in the York and the Potomac habitats. The trace elements (Mn, Ba, and La) provided the best discrimination in 2001, a year of lower freshwater discharge than 1998. This is the first application of a rare earth element measured in otoliths (La) to discriminate habitats, and identify seagrass habitats for juvenile spotted seatrout at spatial scales of 15 km. Such fine spatial scale discrimination of habitats has not been previously achieved in estuaries and will distinguish fish born in individual seagrass beds in the Bay.

scholarly journals Using Movements and Habitat Utilization as a Functional Metric of Restoration for Estuarine Juvenile Fish Habitat

2016 ◽  
Vol 8 (1) ◽  
pp. 361-373 ◽  
Author(s):  
Ryan M. Freedman ◽  
Carrie Espasandin ◽  
Erika F. Holcombe ◽  
Christine R. Whitcraft ◽  
Bengt J. Allen ◽  
...  
Keyword(s):  
Fish Habitat ◽  
Juvenile Fish ◽  
Habitat Utilization

Artificial Reefs as Juvenile Fish Habitat in a Marina

2017 ◽  
Vol 336 ◽  
pp. 1341-1351 ◽  
Author(s):  
Allison Patranella ◽  
Kirk Kilfoyle ◽  
Sylvain Pioch ◽  
Richard E. Spieler
Keyword(s):  
Fish Habitat ◽  
Juvenile Fish ◽  
Artificial Reefs

scholarly journals The role of closed areas in rebuilding monkfish populations in the Gulf of Maine

2008 ◽  
Vol 65 (7) ◽  
pp. 1326-1333 ◽  
Author(s):  
Melissa D. Smith ◽  
Jonathan H. Grabowski ◽  
Philip O. Yund
Keyword(s):  
New England ◽  
Diet Composition ◽  
Gulf Of Maine ◽  
Fish Habitat ◽  
Juvenile Fish ◽  
Habitat Type ◽  
Management Tool ◽  
Feeding Intensity ◽  
Groundfish Fishery

Abstract Smith, M. D., Grabowski, J. H., and Yund, P. O. 2008. The role of closed areas in rebuilding monkfish populations in the Gulf of Maine. – ICES Journal of Marine Science, 65: 1326–1333. The use of fish closures as a management tool to protect juvenile fish habitat and adult spawning grounds has become increasingly popular, although knowledge of the direct effects of marine closures on juvenile fish populations is limited. Given that monkfish landings account for a considerable percentage of the monetary value derived from the groundfish fishery in new England, investigating the factors that influence monkfish population dynamics will assist managers in sustaining this important natural resource. We conducted bottom-trawl surveys to determine the effects of closure status [inside vs. outside the Western Gulf of Maine Closure Area (WGMCA)] and habitat type (mud bottom in isolation from gravel or cobble bottom vs. mud that is next to these more complex habitats) on the distribution, abundance, and diet composition of monkfish (Lophius americanus) in the Gulf of Maine. Surprisingly, the abundance of adult monkfish did not differ in vs. out of the closure, and juvenile monkfish were more abundant outside of the WGMCA, where they also exhibited higher feeding intensity and consumed more prey biomass. Monkfish diet and condition results implied that the boulder and ledge bottom is essential monkfish habitat and that these effects were independent of the WGMCA.

Tropical seaweed beds as important habitats for juvenile fish

2017 ◽  
Vol 68 (10) ◽  
pp. 1921 ◽  
Author(s):  
S. A. Tano ◽  
M. Eggertsen ◽  
S. A. Wikström ◽  
C. Berkström ◽  
A. S. Buriyo ◽  
...  
Keyword(s):  
Fish Species ◽  
Fish Assemblages ◽  
Fish Habitat ◽  
Juvenile Fish ◽  
Visual Census ◽  
Seagrass Meadows ◽  
Commercially Important ◽  
Fish Habitats ◽  
Habitat Variables

Seaweed beds within tropical seascapes have received little attention as potential fish habitat, despite other vegetated habitats, such as seagrass meadows and mangroves, commonly being recognised as important nurseries for numerous fish species. In addition, studies of vegetated habitats rarely investigate fish assemblages across different macrophyte communities. Therefore, the aim of the present study was to investigate the role of tropical seaweed beds as fish habitat, particularly for juvenile fish, by comparing their fish assemblages with those of closely situated seagrass beds. Fish assemblages were assessed by visual census in belt transects, where fish were identified and their length estimated, and habitat variables were estimated for each transect. The abundance of juvenile fish in seaweed beds was twice as high as that in seagrass meadows, whereas there was no difference in total, subadult or adult fish abundance. In addition, the abundance of commercially important and coral reef-associated juveniles was higher in seaweed beds, as was fish species richness. Fish assemblages differed between habitats, with siganids being more common in seagrass meadows and juvenile Labridae and Serranidae more common in seaweed beds. These results highlight that tropical seaweed beds are important juvenile fish habitats and underscore the need to widen the view of the shallow tropical seascape.

Relating otolith chemistry to surface water chemistry in a coastal plain estuary

2007 ◽  
Vol 64 (3) ◽  
pp. 411-424 ◽  
Author(s):  
Emmanis Dorval ◽  
Cynthia M Jones ◽  
Robyn Hannigan ◽  
Jacques van Montfrans
Keyword(s):  
Water Chemistry ◽  
Juvenile Fish ◽  
Spotted Seatrout ◽  
Otolith Chemistry ◽  
Cynoscion Nebulosus ◽  
Environmental Tracers ◽  
Surface Water Chemistry ◽  
Water Composition ◽  
Temperature Exposure ◽  
The Relationship

Although laboratory studies confirm that otoliths incorporate trace elements and stable isotopes from surrounding waters, few studies explore the relationship of otolith chemistry to water chemistry in the field and none include a larger suite of environmental tracers, such as rare earth elements. Using spotted seatrout (Cynoscion nebulosus) as model species, we tested the hypothesis that otoliths record the water chemistry of seagrass habitats in Chesapeake Bay. In summer 2001, we sampled water and juvenile fish in seagrass beds of the bay. Weighted linear regressions showed that [Ba/Ca]otolith and [La/Ca]otolith were best predicted by salinity and were modeled as [Ba/Ca]otolith (µmol·mol–1) = –2.25 ± 0.35 × salinity + 59.47 ± 7.01) and [La/Ca]otolith (pmol·mol–1) = –8.71 ± 0.65 × salinity + 243.87 ± 12.52. [Ba/Ca]otolith increased with [Ba/Ca]water, but the relationship was nonlinear. Salinity did not influence [Mn/Ca]otolith, but this ratio was positively correlated with [Mn/Ca]water. Although the partition coefficient of Sr (DSr = 0.23 ± 0.019) was similar to that in laboratory experiments, [Sr/Ca] in waters and otoliths was decoupled despite equal temperature exposure, suggesting that [Sr/Ca]otolith concentration may not be a simple function of water composition. However, there was a predictive relationship between [δ18O]otolith and [Sr/Ca]water ([δ18O]otolith = 1.18 ± 0.09 × [Sr/Ca]water (mmol·mol–1) – 14.286 ± 0.78) resulting from mixing between fluvial and oceanic waters. Water chemistry showed mixed values as a proxy for otolith chemistry and may not be a surrogate for otolith chemistry in wide estuaries.

scholarly journals DAMPAK PEMASANGAN HUNIAN IKAN BUATAN SEBAGAI UPAYA PEMULIHAN HABITAT SUMBERDAYA IKAN DEMERSAL DI PERAIRAN PANTAI BREBES, JAWA TENGAH

2017 ◽  
Vol 9 (1) ◽  
pp. 31 ◽  
Author(s):  
R Thomas Mahulette ◽  
Duto Nugroho
Keyword(s):  
Coastal Waters ◽  
Fish Habitat ◽  
Well Being ◽  
Demersal Fish ◽  
Coastal Communities ◽  
Anthropogenic Factors ◽  
Recreational Fishing ◽  
Artificial Habitat ◽  
Coastal Habitat

Teknologi hunian ikan buatan (Fish shelter) telah banyak digunakan di berbagai perairan dan telah berkontribusi pada perbaikan kualitas habitat pada kawasan yang telah terdegradasi akibat faktor-faktor antropogenik. Perairan pantai Brebes merupakan kawasan dengan aktivitas perikanan padat tangkap yang telah beroperasi sejak lama. Tujuan utama penerapan teknologi tersebut untuk memperbaiki habitat ikan demersal yang terdegradasi oleh aktivitas perikanan tangkap yang telah berjalan. Pada tahun 2013–2014 telah dilakukan upaya penerapan teknologi hunian ikan buatan melalui penenggelaman sejumlah modul bangunan bawah air di kawasan tersebut. Desain dan konstruksi hunian ikan buatan mengikuti bentuk kubus terbuat dari beton berongga dan disusun bertingkat dalam air berbentuk piramida. Diharapkan bangunan yang dibentuk akan menjadi habitat buatan untuk memperbaiki ketersediaan dan kelimpahan ikan di sekitar kawasan tersebut. Hasil pengamatan secara kualitatif selama 1 tahun penenggelaman memberikan informasi bahwa terjadi peningkatan kelimpahan ikan demersal (kakap dan kerapu) yang dibuktikan dengan data hasil tangkapan nelayan yang beroperasi disekitar kawasan tersebut. Manfaat lain adalah mulai berkembangnya perikanan rekreasi dengan alat tangkap pancing. Tulisan ini disusun sebagai bagian dari awal keberhasilan penenggelaman bangunan bawah air sebagai salah satu upaya untuk memperbaiki habitat di kawasan padat tangkap. Upaya mengubah pola pemanfaatan sumberdaya menjadi lebih bertanggung jawab telah disosialisasikan. Kesejahteraan masyarakat pesisir dalam jangka panjang sangat perlu didukung oleh pengelolaan dan kebijakan pemanfaatan ekosistem dalam jangka panjang.  The fish shelter has been widely used and contributed on restoring the healthiness level of demersal coastal habitat in degraded areas due to anthropogenic factors. Brebes coastal waters is an area with dense capture fisheries activities that have been operating since decades. The research aims to apply this technology for recovering the fish habitat that has been degraded by demersal fishing activities. In 2013 – 2014, the fish shelters have been deployed to address those issues. The design and construction of fish shelters following the a cubical shapes made by concrete and placed in an underwater pyramid-shaped. It is expected that the underwater construction will become artificial habitat to improve the availability and abundance of fishes in the surrounding area. The observations were carried out to monitor the fish shelters within 1 year. The result indicates that the large demersal fish (snapper and grouper) found in relatively high around the shelter. It also proved by landing data fishers that operated around the fish shelters. Moreover, the recreational fishing with line have been developed after the deployments. This paper deal with the initial success of the installment underwater building as part of the efforts for restoring the habitat in the area. The campaign on sustainable fishing technique also have been disseminate to the fishers community. This is important  since long-term well-being of coastal communities in the region should be supported by a better fisheries system including healthy ecosystem. 

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