scholarly journals Common Dolphin (Delphinus delphis) Bycatch in New Zealand Commercial Trawl Fisheries

PLoS ONE ◽  
2013 ◽  
Vol 8 (5) ◽  
pp. e64438 ◽  
Author(s):  
Finlay N. Thompson ◽  
Edward R. Abraham ◽  
Katrin Berkenbusch
Keyword(s):  
New Zealand ◽  
Common Dolphin ◽  
Delphinus Delphis ◽  
Trawl Fisheries

scholarly journals Prey preferences of adult sea bass Dicentrarchus labrax in the northeastern Atlantic: implications for bycatch of common dolphin Delphinus delphis

2013 ◽  
Vol 70 (2) ◽  
pp. 452-461 ◽  
Author(s):  
J. Spitz ◽  
T. Chouvelon ◽  
M. Cardinaud ◽  
C. Kostecki ◽  
P. Lorance
Keyword(s):  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Common Dolphin ◽  
Bay Of Biscay ◽  
Predator Species ◽  
Delphinus Delphis ◽  
Prey Preferences ◽  
Common Dolphins ◽  
Trawl Fisheries ◽  
Northeastern Atlantic

Abstract Spitz, J., Chouvelon, T., Cardinaud, M., Kostecki, C., and Lorance, P. 2013. Prey preferences of adult sea bass Dicentrarchus labrax in the northeastern Atlantic: implications for bycatch of common dolphin Delphinus delphis – ICES Journal of Marine Science, 70: 452–461. In the northeastern Atlantic, adult sea bass (Dicentrarchus labrax) is one of largest fish living on the shelf, and this species has important commercial value. However, pelagic trawl fisheries that target sea bass have negative operational interactions with common dolphins (Delphinus delphis). Our goal was to determine the diet of adult sea bass in the Bay of Biscay from stomach-content and stable-isotope analyses, and explore the dietary overlap between sea bass and common dolphins. We found that sea bass primarily target small pelagic fish, most notably mackerel (Scomber scombrus), scads (Trachurus spp.), anchovy (Engraulis encrasicolus), and sardine (Sardina pilchardus). These four species also dominated the diets of common dolphins. This overlap in feeding preferences could increase the risk of dolphins being caught by trawl fisheries while feeding among sea bass, and may be an underlying mechanism to explain the high rate of common dolphin bycatch observed in the pelagic trawl fishery for sea bass in the Bay of Biscay. Understanding the foraging ecology and trophic interactions of predator species is an essential step for identifying and resolving management issues in the northeastern Atlantic and other marine ecosystems.

Foraging ecology of the common dolphin Delphinus delphis revealed by stable isotope analysis

2020 ◽  
Vol 652 ◽  
pp. 173-186
Author(s):  
KJ Peters ◽  
SJ Bury ◽  
EL Betty ◽  
GJ Parra ◽  
G Tezanos-Pinto ◽  
...  
Keyword(s):  
New Zealand ◽  
Stable Isotope ◽  
Body Length ◽  
Stable Isotope Analysis ◽  
Foraging Ecology ◽  
Isotope Analysis ◽  
Minor Effect ◽  
Common Dolphin ◽  
Delphinus Delphis ◽  
Common Dolphins

Dolphins are among the largest and most diverse predators in marine ecosystems, but our understanding of their foraging ecology, which is crucial for ecosystem management, is poor. Delphinus delphis (common dolphins) are found in tropical and temperate waters globally. Stomach content studies indicate they are opportunistic predators that feed locally on abundant small pelagic schooling fish, but information is lacking on how their diet may vary seasonally and with ontogeny. We investigated effects of body length, sex, season, and year on D. delphis diet in the Hauraki Gulf, New Zealand, using carbon (δ13C) and nitrogen (δ15N) stable isotope analysis of 56 skin samples collected during 13 years (2004-2016). Dolphin δ15N values changed with body length, suggesting ontogenetic dietary variation. Nitrogen isotope values were higher in austral autumn/winter compared to spring/summer, whilst δ13C values decreased throughout the study period, suggesting temporal changes in primary productivity likely affecting the dolphins’ diet. Sex had a minor effect on dolphin δ13C values, with male and female isotopic niches overlapping by 62.6% and 45.2% (respectively). Our results provide a baseline for detecting future changes in the trophic ecology of D. delphis in a key habitat in New Zealand and highlight their role as a sentinel species in this coastal ecosystem.

Coinfection by Streptococcus phocae and cetacean morbillivirus in a short-beaked common dolphin Delphinus delphis

2017 ◽  
Vol 124 (3) ◽  
pp. 247-252 ◽  
Author(s):  
J Díaz-Delgado ◽  
E Sierra ◽  
AI Vela ◽  
M Arbelo ◽  
D Zucca ◽  
...  
Keyword(s):  
Common Dolphin ◽  
Delphinus Delphis ◽  
Cetacean Morbillivirus

scholarly journals Tourism affects the behavioural budget of the common dolphin Delphinus sp. in the Hauraki Gulf, New Zealand

2008 ◽  
Vol 355 ◽  
pp. 287-295 ◽  
Author(s):  
KA Stockin ◽  
D Lusseau ◽  
V Binedell ◽  
N Wiseman ◽  
MB Orams
Keyword(s):  
New Zealand ◽  
Common Dolphin ◽  
The Common

scholarly journals Microplastics in the stomach contents of common dolphin (Delphinus delphis) stranded on the Galician coasts (NW Spain, 2005–2010)

2018 ◽  
Vol 137 ◽  
pp. 526-532 ◽  
Author(s):  
Alberto Hernandez-Gonzalez ◽  
Camilo Saavedra ◽  
Jesús Gago ◽  
Pablo Covelo ◽  
M. Begoña Santos ◽  
...  
Keyword(s):  
Stomach Contents ◽  
Common Dolphin ◽  
Nw Spain ◽  
Delphinus Delphis

Endocarditis Associated with Wohlfahrtiimonas chitiniclastica in a Short-beaked Common Dolphin (Delphinus delphis)

2015 ◽  
Vol 51 (1) ◽  
pp. 283-286 ◽  
Author(s):  
Diaz-Delgado Josue ◽  
Sierra Eva ◽  
Vela Ana Isabel ◽  
Dominguez Lucas ◽  
Andrada Marisa ◽  
...  
Keyword(s):  
Common Dolphin ◽  
Delphinus Delphis

scholarly journals Fatal Streptococcus iniae Infection in a Juvenile Free-Ranging Short-Beaked Common Dolphin (Delphinus delphis)

Animals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3123
Author(s):  
Rebecca Souter ◽  
Anne-Lise Chaber ◽  
Ken Lee ◽  
Aaron Machado ◽  
Jia Lam ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Skin Lesions ◽  
Streptococcus Iniae ◽  
Common Dolphin ◽  
Farmed Fish ◽  
Fish Stocks ◽  
Zoonotic Pathogen ◽  
Delphinus Delphis ◽  
Source Of Infection ◽  
Free Ranging

Streptococcus iniae (S. iniae) is a significant aquatic pathogen of farmed fish species, important zoonotic pathogen, and reported cause of disease in captive Amazon River dolphins (Inia geoffrensis) and a bottlenose dolphin (Tursiops truncatus). Here we report S. iniae as the cause of subcutaneous abscesses, sepsis and mortality in a juvenile free-ranging short-beaked common dolphin (Delphinus delphis) found deceased on a metropolitan Australian beach. Body surfaces were covered by multifocal, depressed, deep, irregular cutaneous ulcerations, which microscopically were characterised by ruptured subcutaneous abscesses with intralesional cocci. Routine microbiological investigations revealed a heavy growth of beta-haemolytic Streptococcus sp. identified as Streptococcus iniae in skin lesions as well as from heart blood, the latter supportive of sepsis. Tissues were negative for cetacean morbillivirus and no other disease processes were identified. S. iniae has not been reported in free-ranging marine mammals, nor in Australian delphinids, previously. More notably a pathogen of captive animals, this case report identifies S. iniae as a pathogen of wild dolphins also. In addition to expanding the host reservoir of a significant zoonotic pathogen, determining the source of infection as well as possible consequences for other marine mammals and wild and intensive fish stocks warrants further investigations.

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