Spatial and temporal differences in assemblages of demersal fishes on the inner continental shelf off Sydney, south-eastern Australia

Variations in assemblages of demersal fishes occurring in different depths of water (30, 60 and 100 m) on the inner continental shelf off Sydney are described. Assemblages comprised a diverse and abundant ichthyofauna; many species were of economic importance. Classification analyses showed that assemblages of demersal fishes at 30 and 60 m depth were most similar to each other and that they consistently differed from those at 100 m depth. This difference may reflect a change in the demersal ichthyofauna from a nearshore to an offshore assemblage. The depth-delineated differences between assemblages agree with those found in similar studies on demersal fishes in coastal waters elsewhere. The distributions and relative abundances of many species differed markedly among depths, but such differences were not always consistent between localities or throughout time. Despite this, some species showed some temporal affinity with a particular site and/or depth. The study confirmed spatial and temporal variabilities in the demersal fish fauna in coastal waters off Sydney; such heterogeneity must be considered when future studies are designed.

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Distribution patterns of the demersal fish fauna on the inner continental shelf of Suriname

Regional Studies in Marine Science ◽

10.1016/j.rsma.2015.10.008 ◽

2015 ◽

Vol 2 ◽

pp. 177-188 ◽

Cited By ~ 5

Author(s):

Tomas Willems ◽

Annelies De Backer ◽

Jan H. Mol ◽

Magda Vincx ◽

Kris Hostens

Keyword(s):

Continental Shelf ◽

Fish Fauna ◽

Distribution Patterns ◽

Demersal Fish ◽

Inner Continental Shelf

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ICHTHYOFAUNA IN THE INNER CONTINENTAL SHELF NEXT TO THE PARANAGUÁ ESTUARINE COMPLEX, SOUTHERN BRAZIL

Boletim do Instituto de Pesca ◽

10.20950/1678-2305.2020.46.4.603 ◽

2021 ◽

Vol 46 (4) ◽

pp. 1-13

Author(s):

Cesar SANTOS ◽

Roberto SCHWARZ JUNIOR ◽

Helen Audrey PICHLER ◽

Olímpio Rafael CARDOSO ◽

Marcelo Renato LAMOUR ◽

...

Keyword(s):

Continental Shelf ◽

Fish Assemblages ◽

Fish Fauna ◽

Temporal Variations ◽

Otter Trawl ◽

Rainfall Regime ◽

Wet Season ◽

Environmental Characteristics ◽

The North ◽

Inner Continental Shelf

The composition and structure of fish assemblages in the inner continental shelf of the Paraná State are affected by cold fronts and the rainfall regime. Data from fishing activities in this region, as well as the analysis of environmental characteristics, are the main tools available for understanding fish dynamics, under influence of increasing human activities. In order to better understand patterns and temporal variations in fish assemblages in the inner continental shelf of the Paraná State, a total of 24 double trawls were performed with an otter trawl between August 2000 and July 2001, in two sampling areas, the North area in front of the northern mouth of the Paranaguá Estuary Complex, and the South area, in front of the Leste beach. A total of 45,277 fish specimens belonging to 35 families and 97 species were caught. Sciaenidae was the most abundant family, with 37.1% of the total number of individuals caught, and with the highest richness (18 species). Statistical analyses evidenced significant differences in environmental characteristics and in fish fauna, and that both areas disturbances were observed in the fish assemblages during the dry and wet season, being more intense in the Southern area, disturbances that would be related to the shrimp fishing present in the two areas sampled in this study.

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Demersal fish community on the inner shelf of Ubatuba, southeastern Brazil

Revista Brasileira de Oceanografia ◽

10.1590/s1413-77391998000200001 ◽

1998 ◽

Vol 46 (2) ◽

pp. 93-109 ◽

Cited By ~ 24

Author(s):

Gecely R. A. Rocha ◽

Carmen L. D. B. Rossi-Wongtschowski

Keyword(s):

Continental Shelf ◽

Coastal Water ◽

Fish Community ◽

Species Abundance ◽

Fish Fauna ◽

Sampling Period ◽

Demersal Fish ◽

Southeastern Brazil ◽

Otter Trawl ◽

South Atlantic Central Water

Fluctuations in the distribution and abundance of demersal fishes collected by otter trawl on the continental shelf of Ubatuba were examined over a two-year sampling period, in an area up to 50 m depth. A total of 111 species were collected. Seasonal and annual fluctuations in species abundance were related to differences in the distribution of Coastal Water and South Atlantic Central Water masses. The demersal fish fauna in the area was divided into three ecologically distinct communities: Tropical Sciaenid, Subtropical Sciaenid, and Gerreid-Haemulid. The most important one is the Tropical Sciaenid Community, characterized by Ctenosciaena gracilicirrhus, Paralonchurus brasiliensis, and Cynoscion jamaicensis.

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Hydrography of the Inner Continental Shelf along the Southwest Buenos Aires Province, Argentina: Influence of an Estuarine Plume on Coastal Waters

Journal of Coastal Research ◽

10.2112/jcoastres-d-16-00064.1 ◽

2017 ◽

Vol 33 (4) ◽

pp. 907-916 ◽

Cited By ~ 8

Author(s):

Ana Laura Delgado ◽

María Clara Menéndez ◽

María Cintia Piccolo ◽

Gerardo Miguel Eduardo Perillo

Keyword(s):

Continental Shelf ◽

Coastal Waters ◽

Buenos Aires ◽

Buenos Aires Province ◽

Inner Continental Shelf

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Demersal ichthyofauna of the inner continental shelf off Ilhéus, Bahia, Brazil

Biota Neotropica ◽

10.1590/s1676-06032009000400016 ◽

2009 ◽

Vol 9 (4) ◽

pp. 163-168 ◽

Cited By ~ 3

Author(s):

Leonardo Evangelista Moraes ◽

Renato de Mei Romero ◽

Gecely Rodrigues Alves Rocha ◽

Rodrigo Leão de Moura

Keyword(s):

Continental Shelf ◽

Fish Assemblage ◽

General Structure ◽

First Record ◽

Demersal Fish ◽

South Atlantic ◽

Range Extension ◽

The South ◽

The Caribbean ◽

Inner Continental Shelf

We present an inventory of demersal fishes from the inner continental shelf off Ilhéus, Bahia, Brazil. Three sites were sampled monthly, between March 2003 and February 2005, with standardized bottom trawls (30 minutes, 16 m depth, 22/16 mm mesh). A total of 7.857 specimens were captured, belonging to three species of Chondrichthyes and 95 species of Actinopterygii (77 genera and 40 families). The occurrence of Ampharius phrygiatus represents a southern range extension for this species, which was previously known only from the narrow coastal stretch between Guyana and Maranhão State (Brazil). The record of Synodus poeyi represents the first record of this species in Brazil and in the South Atlantic, as it was previously recorded only in the Caribbean. The general structure of the demersal fish assemblage is described and commented upon.

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Ichthyofauna of the inner shelf of Paraná, Brazil: checklist, geographic distribution, economic importance and conservation status

Biota Neotropica ◽

10.1590/1676-0611-bn-2017-0385 ◽

2018 ◽

Vol 18 (2) ◽

Cited By ~ 6

Author(s):

Daphne Spier ◽

Humberto Luiz Nadolny Gerum ◽

Hugo Bornatowski ◽

Riguel Contente ◽

Natalia A S Mattos ◽

...

Keyword(s):

Continental Shelf ◽

Geographic Distribution ◽

Fish Species ◽

Conservation Status ◽

Economic Importance ◽

The West ◽

Species Vulnerability ◽

Anthropogenic Threats ◽

Inner Continental Shelf ◽

Very High

Abstract Comprehensive species checklists are essential to effectively implementing preservation and recovery measures, and should assess conservation status, vulnerability degree and anthropogenic threats. This checklist was compiled from fish species recorded in surveys conducted over the last 30 years in the shallow inner continental shelf in the State of Paraná, Brazil. Information on biogeography, conservation status, economic importance and degree of species’ vulnerability are provided. A total of 272 fish species were recorded, spanning 25 orders and 88 families. The most speciose family was Sciaenidae (25 species), followed by Carangidae (23), Engraulidae (10), Carcharhinidae (9), Epinephelidae (9) and Paralichthyidae (9). Most species occurring in Paraná’s shallow inner continental shelf are restricted to the West Atlantic. In terms of economic importance, 93% (253) of the species recorded were of fishery, aquaculture or aquaria interest. A notable fraction (39%) of the recorded species was classified as having moderate to very high vulnerability to extinction. In particular, 28 species (10%) were listed as globally endangered, and 34 species (12%) were listed as endangered in the Brazilian territory.

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Long term fish assemblages as units of management in a temperate estuary (Rio de La Plata - SW Atlantic Ocean)

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592011000100004 ◽

2011 ◽

Vol 59 (1) ◽

pp. 43-59 ◽

Cited By ~ 8

Author(s):

María Inés Lorenzo ◽

Juan M. Díaz de Astarloa ◽

Walter Norbis ◽

María B Cousseau

Keyword(s):

Continental Shelf ◽

Fish Assemblages ◽

Open Systems ◽

Principal Component ◽

Demersal Fish ◽

Rio De La Plata ◽

Environmental Characteristics ◽

Río De La Plata ◽

La Plata ◽

Inner Continental Shelf

Demersal fish assemblages from trawl surveys in the Rio de la Plata estuary and its inner continental shelf were analyzed from 1975 to 1995. The first two factors of Principal Component Analysis explained 48% of the variance in species distribution, and they are consistent with the results of a cluster analysis. The analysis indicated the existence of three spatially and temporally distinct fish assemblages: internal and external estuarine and inner continental shelf (Uruguayan coastal assemblages). These assemblages were persistent considering the environmental characteristics and their species composition. Despite the changes registered in the species density during the period surveyed, the fish assemblages tend to persist over time. It was demonstrated that the assemblages can be considered as open systems and that there exists a reciprocal flow of organisms between adjacent associations. However, each assemblage showed high spatial and temporal persistence in accordance with the environmental characteristics of the system analyzed. Therefore, and according to the multispecies fisheries operating in the system, each assemblage defined could be considered a unit of management.

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