Hematozoa of deep-sea demersal fish of the Northwest Atlantic Ocean

1992 ◽  
Vol 70 (10) ◽  
pp. 1926-1933 ◽  
Author(s):  
R. A. Khan ◽  
W. Threlfall ◽  
W. S. Whitty
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
Fish Species ◽  
Deep Sea ◽  
Demersal Fish ◽  
Northwest Atlantic ◽  
Physico Chemical ◽  
Chemical Factors ◽  
Total Fish

A total of 410 deep-sea demersal fish comprising 54 species was taken at depths of 1000–3200 m from two locations in the Northwest Atlantic Ocean and examined for hematozoans. Prevalences of 29% of the total fish and 61% of the species examined were observed. Piroplasms (Haemohormidium spp.) were the most common parasites (26% infection), with hemogregarine, trypanosome, and cryptobia infections being considerably lower. Haemogregarina marshalllairdi sp.nov. is described from Nezumia bairdi and Macrourus berglax. An enigmatic intraerythrocytic parasite was observed in one fish. A comparison of prevalences of the infections in fish living in the deep sea, on the continental shelf, and in inshore areas indicates that the percentages of fish species infected are comparable in the three areas and that the prevalence of piroplasm infections is greater in the deep-sea locations. It is likely that transmission of hematozoans, probably by hematophagous leeches, in the deep-sea demersal zone is similar to that on the continental shelf, despite the dramatic changes in biological and physico-chemical factors with increasing depth.

Deep-sea demersal fish species richness in the Porcupine Seabight, NE Atlantic Ocean: global and regional patterns

2009 ◽  
Vol 31 (1) ◽  
pp. 247-260 ◽  
Author(s):  
Imants G. Priede ◽  
Jasmin A. Godbold ◽  
Nicola J. King ◽  
Martin A. Collins ◽  
David M. Bailey ◽  
...  
Keyword(s):  
Species Richness ◽  
Atlantic Ocean ◽  
Fish Species ◽  
Deep Sea ◽  
Demersal Fish ◽  
Ne Atlantic ◽  
Regional Patterns ◽  
Porcupine Seabight ◽  
Ne Atlantic Ocean

scholarly journals Demersal fish assemblages and habitat characteristics on the continental shelf and upper slope of the north-western Mediterranean

2000 ◽  
Vol 80 (6) ◽  
pp. 981-988 ◽  
Author(s):  
Montserrat Demestre ◽  
Pilar Sánchez ◽  
Pere Abelló
Keyword(s):  
Continental Shelf ◽  
Fish Species ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Western Mediterranean ◽  
Habitat Characteristics ◽  
Species Assemblages ◽  
The North ◽  
Benthic Sediments ◽  
Upper Slope

Continental shelf and upper slope fish communities were studied along the Catalan coast based on 66 experimental bottom otter trawls. A total of 79 demersal fish species were studied by means of cluster analysis and multi-dimensional scaling (MDS) ordination for community structure. Analysis revealed the existence of five major location clusters. Similarity percentage analysis (SIMPER) was determined by comparing the dissimilarity between two groups of samples using the discriminating species. Geomorphological characteristics, bottom substratum and depth showed direct influences on species assemblages. High correlation between the biotic data samples and depth was observed. The fish species assemblages identified five main demersal fish associations which corresponded with the five location clusters and with five benthic sediments (mud of the upper slope, sand and gravel, mud of the shelf, muddy-sand and sand with rocky outcrops).

Fish parasites in the Arctic deep-sea: Poor diversity in pelagic fish species vs. heavy parasite load in a demersal fish

2006 ◽  
Vol 53 (7) ◽  
pp. 1167-1181 ◽  
Author(s):  
Sven Klimpel ◽  
Harry Wilhelm Palm ◽  
Markus Wilhelm Busch ◽  
Esra Kellermanns ◽  
Sonja Rückert
Keyword(s):  
Fish Species ◽  
Deep Sea ◽  
Parasite Load ◽  
Demersal Fish ◽  
Pelagic Fish ◽  
Fish Parasites ◽  
The Arctic

scholarly journals Systematic Conservation Planning at an Ocean Basin Scale: Identifying a Viable Network of Deep-Sea Protected Areas in the North Atlantic and the Mediterranean

2021 ◽  
Vol 8 ◽  
Author(s):  
Magali Combes ◽  
Sandrine Vaz ◽  
Anthony Grehan ◽  
Telmo Morato ◽  
Sophie Arnaud-Haond ◽  
...  
Keyword(s):  
Fish Species ◽  
North Atlantic ◽  
Conservation Planning ◽  
Deep Sea ◽  
Demersal Fish ◽  
Systematic Conservation Planning ◽  
The North ◽  
Basin Scale ◽  
The North Atlantic ◽  
Conservation Network

Designing conservation networks requires a well-structured framework for achieving essential objectives such as connectivity, replication or viability, and for considering local management and socioeconomic stakes. Although systematic conservation planning (SCP) approaches are increasingly used to inform such networks, their application remains challenging in large and poorly researched areas. This is especially the case in the deep sea, where SCP has rarely been applied, although growing awareness of the vulnerability of deep-sea ecosystems urges the implementation of conservation measures from local to international levels. This study aims to structure and evaluate a framework for SCP applicable to the deep sea, focusing on the identification of conservation priority networks for vulnerable marine ecosystems (VMEs), such as cold-water coral reefs, sponge grounds, or hydrothermal vents, and for key demersal fish species. Based on multi-objective prioritization, different conservation scenarios were investigated, allowing the impact of key elements such as connectivity and conservation cost to be evaluated. Our results show that continental margin slopes, the Mid-Atlantic Ridge, and deeper areas of large and productive shelves housing fishing grounds appeared as crucial zones for preserving the deep-sea biodiversity of the North Atlantic, and within the limitations imposed by the data available, of the Mediterranean. Using biologically-informed connectivity led to a more continuous and denser conservation network, without increasing the network size. Even when minimizing the overlap with socioeconomic activities, the inclusion of exploited areas was necessary to fulfil conservation objectives. Such areas included continental shelf fishing grounds for demersal fish species, and areas covered by deep-sea mining exploration contracts for hydrothermal vent communities. Covering 17% of the study area and protecting 55% of each feature on average, the identified priority network held a high conservation potential. However, these areas still suffer from poor protection, with 30% of them benefiting from some form of recognition and 11% only from protection against trawling. Integrating them into current marine spatial planning (MSP) discussions could foster the implementation of a basin-scale conservation network for the deep sea. Overall, this work established a framework for developing large-scale systematic planning, useful for managing Areas Beyond National Jurisdiction (ABNJ).

scholarly journals Ichthyofaunal Diversity and Physico-Chemical Factors of Melamchi River, Sindhupalchok, Nepal

2016 ◽  
Vol 21 (1) ◽  
pp. 10-18
Author(s):  
Abha R. Mishra ◽  
Chitra Bahadur Baniya
Keyword(s):  
Fish Species ◽  
Fish Community ◽  
Diversity Index ◽  
Chemical Properties ◽  
Habitat Characteristics ◽  
Fish Diversity ◽  
Physico Chemical ◽  
Chemical Factors ◽  
High Level

The fish community and physico-chemical properties at five sites of Melamchi River were studied monthly from January 2011 to December 2013.    Melamchi River is one of tributaries larger Indrawati River basin, originates from the high snowy Jugal Mountain (5,875 m asl). Eleven fish species within two orders and five families were recorded.   Cypriniformes  was  found  to  be  the  most  dominant  order  with  ten  fish  species. Schizothorax plagiostomus  was the most common fish species followed by  Neolissochilus hexagonolepis, and  Psilorhynchus pseudecheneis.  Shannon Wiener fish diversity index and species richness recorded were highest at site 2 and lowest at site 5, whereas, evenness index was highest at site 3. The cluster analysis revealed  that  similarity  between  fish  species  decreased  as  the  distance  between  the  sites  increased.  Fish species were found distributed among four groups with respect to the significant habitat characteristics in the redundancy analysis (RDA). River water was found well-oxygenated and alkaline at all sites. However, high level for turbidity (43.25/ NTU) was observed at site 5, which exceeded compliance levels of WHO indicating the influence of intensive agriculture and deforestation along river area. To improve fish diversity and water quality of this river proper monitoring and management are an urgent need.Journal of Institute of Science and TechnologyVolume 21, Issue 1, August 2016, Page: 10-18

Deep-sea scavenging demersal fish fauna of the Nazaré Canyon system, Iberian coast, north-east Atlantic Ocean

2008 ◽  
Vol 72 (7) ◽  
pp. 1804-1814 ◽  
Author(s):  
N. J. King ◽  
A. J. Jamieson ◽  
P. M. Bagley ◽  
I. G. Priede
Keyword(s):  
Atlantic Ocean ◽  
Deep Sea ◽  
Fish Fauna ◽  
Demersal Fish ◽  
East Atlantic ◽  
North East
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