Determiation of potential favorable zones for pelasic fish aggregation (anchovy) in the Balack Sea using rs and gis

Download
2005
Çiftçi, Nilhan
Fishing is a significant source of food, and constitutes an important source of income in Turkey. Due to the large extent required to analyse the distribution of fish stocks, information derived from satellites play an important role in fisheries applications. Chlorophyll concentration and sea surface temperature (SST) are the most significant parameters which define the fish habitat. The accuracy of these parameters in the Black Sea taken from two different satellites, namely Sea-viewing Wide Field-of-views Sensor (SeaWIFS) and Moderate Resolution Imaging Spectroradiometer (MODIS) are evaluated. Results indicate that both satellites give good estimates of SST but the algorithms overestimate the chlorophyll concentration values. MODIS products are used in the subsequent analyses due to their high correlation with in-situ measurements relative to SeaWIFS products. The cause of the overestimation of chlorophyll concentration is further examined and a general description of environmental variability in Black Sea is done using MODIS products. Anchovy, the most important commercial fish in Turkey, has been selected as the target specie of the study. Level 3 weekly average MODIS chlorophyll and SST products are processed using remote sensing (RS) and geographic information systems (GIS) integration to estimate potential favorable zones for pelagic fish aggregations. Two different decision rules are employed to generate fish stock maps, simple additive weigthing (SAW) and fuzzy additive weigthing (FSAW). The resultant maps are used to visualize the general distribution of Anchovy in Turkish Seas from May 2000 to May 2001. The resultant thematic fish stock maps generated by FSAW analysis represents the uncertainity in the environment better than the ones generated by SAW analysis.

Suggestions

Stock assessment of the Black Sea anchovy
Tutar, Özge; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
The Black Sea anchovy (Engraulis encrasicolus) is economically the most important fish species in Turkey since it provides 60% of the total fish catch. The Turkish fleet catches 90% of the anchovy stock in the Black Sea due to the anchovy winter migration to the Turkish coast. Over the last 50 years, the Black Sea basin has been subjected to pollution due to human sourced nutrient accumulation in the NW basin via the rivers Danube, Dniester and Dnieper and transportation. The ecosystem has been destroyed by...
Current distribution of the small pelagic fish populations in the North Eastern Levantine Sea in relation to environmental conditions and predicting the impacts of temperature rise on their future distributions
Sakınan, Serdar; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
Stocks of traditionally targeted fish species are in decline in the north eastern Levant Sea due to overfishing during recent decades, while catch statistics show a simultaneous increase in landings of commercially less valuable small pelagic species. Moreover, the number of species in the eastern Mediterranean is increasing due to Lessepsian migration and the response of native species to the continuous migration of lessepsian species is in question. Additionally, warming associated with climate change is ...
A Study on possible variant forms of anchovy in the black sea
Şahin, Ezgi; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
The anchovy in the Black Sea is a commercially important fish source for Turkey, which is represented by two different subspecies in the basin. Spawning and feeding occurs in northern coasts where food supplies are more abundant. When the water temperature starts to decrease, the anchovy migrate toward the warmer waters of the southern coasts. The schools formed during this migration make them a primary target for fishing fleets. Due to morphological similarities, it is not possible to report the catches by...
A box model for the basic elements of the northeastern Mediterranean Sea trawl fisheries
Gücü, Ali Cemal (1995-01-01)
A box model has been constructed for the northeastern Mediterranean Sea, where there is no reliable information on the total removal of fish by fisheries. The model utilizes survey data of biomass and these initial values are improved by a series of population dynamics methods. Once absolute values for the system components (length-weight relational growth parameters, mortality estimates, selection ogives, stomach content analysis) are established, biomass transfer within the ecosystem compartments is estim...
Optimization of growth characteristics for the potential probiotics to be used in fish aquaculturing
Aytekin, Nihal Destan; Hamamcı, Haluk; Büyükkileci, Ali Oğuz; Department of Food Engineering (2013)
The aquaculturing of marine and fresh water fish is continually increasing in the world and in Turkey. Of the three fish species; sea bass (Dicentrarchus labrax), seabream (Sparus aurata) and trout (Oncorhynchus mykiss), the latter has the highest share in Turkey, with a current production rate of 170000 tons per annum. The use of antibiotics in true feed is being phased out in the world. Probiotics have emerged one way of making up for the lack of antibiotics in the feed. In order to increase the probiotic...
Citation Formats
N. Çiftçi, “Determiation of potential favorable zones for pelasic fish aggregation (anchovy) in the Balack Sea using rs and gis,” M.S. - Master of Science, Middle East Technical University, 2005.