Realm: Marine
Climate: Temperate
Biome: Temperate shelf and seas ecoregions
Central latitude: 32.132920
Central longitude: 34.668008
Duration: 11 years, from 1990 to 2012

13941 records

268 distinct species

Across the time series Pagellus erythrinus is the most frequently occurring species

Methods

Data were collected from 324 commercial trawl hauls carried out between April 1990 and Decembern1994 by the Israel Fishery Department. These surveys took place onboard trawlers fishing the Israeli continental shelf, between latitudes 31º20’ N and 33º05’ N. Depths ranged between 15 and 300 m. The gross, discarded and landed catch weights were estimated for 173 out of the 324 hauls in which two or more of these variables were recorded, and therefore total catch analysis was possible. A sample of ca. 5% of the biomass (2.7-12.5 kg with a mean of 5.5±2.4 kg per haul) was extracted from each haul. While this partial-sampling method may miss rare species, it allows nearly all the fauna in the nets to be properly sampled and the time-consuming length measurements to be carried out onboard. Fish were taxonomically identified to species level, except for several cases in which only the genus was noted. Fish Total Length (TL), cephalopod Mantle Length (ML) and crustacean Carapace Length (CL for crabs, eye to telson length for shrimps) were measured to the closest 0.5 cm interval. The discard lengths defined in the present study are described in Table 1 and were subsequently used to differentiate between the two discarded fractions: non-commercial species and juveniles of commercial species. These lengths were determined empirically, i.e. they were estimated based on observations of onboard sorting practices, fishermen’s experience and minimum landing size (MLS),rather than on the actual onboard sorting of specimens, which may vary considerably due to factors such asseason, abundance, and market considerations (Machiaset al., 2001, Demestre et al., 2008). The catch sampling protocol from 1990 to 1994 was repeated in 2008–2011. A representative sub-sample from the total catch was obtained from the fish pile onboard with no specific preference given to any direction on deck to assure randomness. All fishes in samples were taxonomically identified to the species level and measured to the nearest 0.5 cm. 1990–1994 data were collected by several surveyors, and hauls with a clear lower taxonomic resolution were subsequently omitted from the database. Historical and modern catch data of Israeli trawlers were used to evaluate trends in abundance, biomass, diversity and TrL of Levantine fishes, and assess potential interactions between invasive and indigenous species. Historical data were collected from 267 trawl hauls from April 1990 to December 1994 at depths of 15–300 m. Current data were collected in 183 hauls conducted between October 2008 and March 2011, covering the same fishing fields and depth range (15–300 m) on the continental shelf and upper slope.

Citation(s)

@Article{BioTIME_cit301, Study_id = {505}, Citation_id = {301}, Author = {Edelist, Dor and Rilov, Gil and Golani, Daniel and Carlton, James T and Spanier, Ehud}, Journal = {Diversity and Distributions}, Number = {1}, Pages = {69-77}, Title = {Restructuring the Sea: profound shifts in the world's most invaded marine ecosystem}, Volume = {19}, Year = {2013}, Doi = {10.1111/ddi.12002}, Issn = {1472-4642}, Url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/ddi.12002}, Urldate = {2017-01-01} }