Browsing by Author "Cengiz, Ozgur"

Now showing 1 - 17 of 17

Age and Growth of Gilthead Sea Bream (Sparus Aurata Linnaeus, 1758) From Northern Aegean Sea (Turkey)
(Mekelle Univ, Coll Natural & Computational Sciences, 2022) Cengiz, Ozgur
The age and growth of gilthead sea bream (Sparus aurata Linnaeus, 1758) were studied in the present study. A total of 126 specimens were collected from commercial fishmongers during the period between January 2015 and December 2015 from the northern Aegean coasts of Turkey. Fork length and the total weight of aged specimens ranged from 29.5 to 48.0 cm and from 425.00 to 2100.00 g, with a mean of 38.5 cm and 101.23 g, respectively. The length-weight relationship was estimated as W = 0.0053FL(3.03) (R-2 = 0.95). The von Bertalanffy growth equations were computed as L-infinity= 52.8 cm, k = 0.29 year(-1),t(0) = -1.25 year for all samples. The growth performance index (phi') was found as 2.91. There is no study on the biology of the species for the northern Aegean Sea. Therefore, this study provides valuable information for the species in this area.
Defining the Reproductive Period of the European Pilchard ( Sardina Pilchardus Walbaum, 1792) in Saros Bay (North Aegean Sea, Turkey)
(Mekelle Univ, Coll Natural & Computational Sciences, 2024) Cengiz, Ozgur; Ozekinci, Ugur; Oztakin, Alkan
The European pilchard ( Sardina pilchardus Walbaum, 1792) is one of the main target species of commercial fishery along the Aegean coasts. This work was carried out between July 2014 and June 2015 off Saros Bay (North Aegean Sea, Turkey). The study focuses on determining the reproductive period of the species. The elevated GSI values suggested the spawning period occurred mainly between September and May with a peak in February.
Estimation of Growth Parameters of the Atlantic Chub Mackerel (Scomber Colias Gmelin, 1789) Off Gallipoli Peninsula (Northern Aegean Sea, Turkey)
(Mekelle Univ, Coll Natural & Computational Sciences, 2022) Cengiz, Ozgur
This study was carried out to reveal the age and growth of the atlantic chub mackerel (Scomber colias Gmelin, 1789) in Gallipoli Peninsula (northern Aegean Sea, Turkey). The individuals of sampled S. colias from commercial fishmongers randomly each month were taken during the period January 2016-December 2016. A total of 348 otoliths were aged successfully. The total length and weight of aged specimens ranged from 16.0 to 28.0 cm and from 31.72 to 222.68 g, with a mean of 22.0 cm and 101.23 g, respectively. The length-weight relationship was estimated as W = 0.0060TL(3.20) (R-2 = 0.97). The von Bertalanffy growth equations were computed to be L-proportional to = 32.0 cm, k = 0.30 year(-1), t(0) = -1.72 year for all samples. The growth performance index (Phi') was found as 2.49. The present study provides the first information on the growth parameters of the species so as to define the current state Scomber colias population for Gallipoli Peninsula (northern Aegean Sea, Turkey).
Growth Characteristics of Annular Seabream (Diplodus Annularis Linnaeus, 1758) for Turkish Waters
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Cengiz, Ozgur; Kizilkaya, Bayram; Parug, Sukru Senol
This study was conducted between January 2016 and December 2016 in Saros Bay. The weight-length relationship was calculated as W = 0.0331TL(2.77) for all samples. A single specimen of D. annularis with the maximum size (23.2 cm in total length and 180.00 g in total weight) was caught off ibrice Bight (Saros Bay) with han (Hine by fisherman on 25 August 2016. The aim of this study was to present the maximum size record of the related species for the Turkish Waters.
Length-Girth Relations of Five Sparid Fishes Off Gokceada Island, Northern Aegean Sea, Turkey
(Springer int Publ Ag, 2023) Cengiz, Ozgur
This study was carried out in order to explore the relations between opercular girth (G(ope)), maximum girth (G(max)) and total length (TL) for five sparid fishes [Pagellus acarne Risso, 1827, Pagellus bogaraveo Brunnich, 1768, Pagellus erythrinus Linnaeus, 1758, Sarpa salpa Linnaeus, 1758, and Spondyliosoma cantharus Linnaeus, 1758] in family sparidae. The samples were obtained during January 2014 to December 2016 with the aid of commercial fishermen off Gokceada Island (Northern Aegean Sea, Turkey). The linear regression of opercular girth and maximum girth with the total length were calculated for each species. G(ope) and G(max) were found to increase linearly with total length for all sparids. The mean +/- standard error (and range) of total length were 16.5 +/- 0.24 (15.0-23.8) cm, 15.0 +/- 0.15 (14.0-17.7) cm, 18.1 +/- 0.38 (15.0-21.5) cm, 28.1 +/- 0.51 (20.3-32.0) cm and 24.9 +/- 0.79 (19.7-31.7) cm for Pagellus acarne, Pagellus bogaraveo, Pagellus erythrinus, Sarpa salpa and Spondyliosoma cantharus, respectively. However, the opercular girth-length relations were calculated as G(ope) = 0.6190TL-1.0964 (r(2)=0.95), G(ope) = 0.9499TL-4.8657 (r(2)=0.85), G(ope) = 0.8453TL-3.7876 (r(2)=0.89), G(ope) = 0.4286TL + 3.0323 (r(2)=0.87), G(ope) = 0.8329TL-1.5604 (r(2)=0.96), whereas the maximum girth-length relations were determined as G(max) = 0.6643TL-0.9501 (r(2)=0.93), G(max) = 1.0017TL-4.6680 (r(2)=0.90), G(max) = 0.8714TL-2.9893 (r(2)=0.88), G(max) = 0.4463TL + 5.2661 (r(2)=0.80), G(max) = 0.8088TL + 1.3091 (r(2)=0.91) for Pagellus acarne, Pagellus bogaraveo, Pagellus erythrinus, Sarpa salpa and Spondyliosoma cantharus, respectively. The present research comprises the first findings about length-girth relations (LGRs) of Spondyliosoma cantharus for the northern Aegean Sea, whereas, no LGRs estimates of Sarpa salpa have beforehand been reported worldwide. Because these findings are important for the selectivity of fishing gear so as to prevent the capture of younger and/or undersized individuals, it will contribute to the development of ecosystem-based fisheries management.
Length-Weight Relationships of Eight Discarded Flatfish Species From Gallipoli Peninsula (Northern Aegean Sea, Turkiye): an Evaluation for Ecosystem-Based Fisheries Management
(Western Philippines Univ, 2022) Cengiz, Ozgur
The fishing management authorities are in need of some biometric throughput and analysis with a view to the administration and protection of fishery stocks. The inputs regarding the lengths and weights of fish species have frequently been taken into account in order to divulge biological information. In the present research, length-weight relationships were extrapolated for discarded eight flatfishes off Gallipoli Peninsula (Northern Aegean Sea, Turkiye). From January 2017 to December 2017, a total of 142 individuals of eight species (Arnoglossus imperialis, Arnoglossus laterna, Arnoglossus rueppelii, Arnoglossus thori, Symphurus nigrescens, Microchirus ocellatus, Microchirus varieagatus, Monochirus hispidus) belonging to three families (Bothidae, Cynoglossidae, Soleidae) were collected from commercial fishermen's catches. The length-weight relationships' slopes (b) varied from 2.64 to 3.41. Every length-weight relationships was statistically significant (P < 0.0001). This paper embodies preliminary data on the LWRs of discarded eight flatfishes for the Gallipoli Peninsula (Northern Aegean Sea, Turkiye). Hence, data on the discarded fish species is of importance when keeping in view sustainable ecosystem-based fisheries management and, in the continuation of the long-dated investigations of the length-weight relationships of the fish species in question. This must be performed on an ongoing basis so as to monitor the current state of fish stocks. The stakeholders could utilize the results of the present research in the coming times.
Maximum Girth, Opercular Girth and Total Length Relationships of Blotched Picarel (Spicara Maena (Linnaeus, 1758)), Picarel (Spicara Smaris (Linnaeus, 1758)) and Mediterranean Rainbow Wrasse (Coris Julis (Linnaeus, 1758)) in the North Aegean Sea
(Springer int Publ Ag, 2024) Cengiz, Ozgur
The paper mentioned was applied using the fish samples obtained by commercial fishermen using gillnets through the stationary set and drive in fishing methods in order to search out length-girth relationships (LGRs) of blotched picarel (Spicara maena (Linnaeus, 1758)), picarel (Spicara smaris (Linnaeus, 1758)) and mediterranean rainbow wrasse (Coris julis (Linnaeus, 1758)) between January 2021 and December 2021 in the Saros Bay (northern Aegean Sea, T & uuml;rkiye). The opercular girth-length relationships were calculated as G(ope) = 0.7176TL - 3.4105 (r(2) = 0.89), G(ope) = 0.5579TL - 2.4407 (r(2) = 0.89) and G(ope) = 0.9118TL - 7.3585 (r(2) = 0.93), whilst the maximum girth-length relationships were estimated as G(max) = 0.9124TL - 4.7124 (r(2) = 0.82), G(max) = 0.5874TL - 1.2491 (r(2) = 0.80) and G(max) = 1.0227TL - 8.6218 (r(2) = 0.95) for Spicara maena, Spicara smaris and Coris julis, respectively. All linear regressions of this research were statistically notable (p < 0.001). The existing research involves the first findings of LGRs of Spicara smaris for the North Aegean Sea, whilst any LGRs values of Coris julis have in days of yore been not reported worldwide, but the paper mentioned. Since the relevant valuates are remarkable for development the selectivity of fishing equipments in order to forestall the seize of immature, undersized, younger fish, it will bolster the advancement of the ecosystem-based fisheries management.
Maximum Length Record of Common Two-Banded Seabream (Diplodus Vulgaris Geoffroy Saint-Hilaire, 1817) for Aegean Sea With Turkish Waters
(Adem Yavuz Sonmez, 2019) Cengiz, Ozgur; Parug, Sukru Senol; Kizilayka, Bayram
The maximum length, weight, and age information of living things in an ecosystem are necessary for population dynamics and stock assessment studies. Hence, the recording of such data may be beneficial for scientific databases for life history and fisheries science. The common two-banded seabream (Diplodus vulgaris Geoffroy Saint-Hilaire, 1817) is a widespread demersal marine fish, which belongs to the Sparidae family and inhabits down to 90 m depth. Because it is a demanded seafood, it has commercial importance and usually available in the fish market almost every month of the year in Turkey. A single specimen of common two-banded seabream with 31.9 cm in total length and 467.00 g in total weight, which was caught off Ibrice Bight (Saroz Bay) with handline by a professional fisherman on 12 June 2015, was obtained from a fishmonger. This study aims to present the maximum size record of this species for the Aegean Sea with Turkish waters.
Maximum Size Record of Brown Meagre (Sciaena Umbra Linnaeus, 1758) for Aegean Sea
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Cengiz, Ozgur; Kizilkaya, Bayram; Parug, Sukru Senol
This study was conducted between January 2013 and December 2013 in Saros Bay. A single specimen of S umbra with the maximum size (41.7 cm in total length and 180.00 g in total length) was caught from Ibrice Bight (Sams Bay) with hand line by fisherman on 20 April 2013. The weight-length relationship was calculated as W = 0.0268TL(2.79) for all samples. The aim of this study is to present the maximum size record of the species for the Aegean Sea.
Opercular Girth, Maximum Girth and Total Length Relationships for Eight Fish Species From the Saros Bay (Northern Aegean Sea, Turkey)
(Western Philippines Univ, 2021) Cengiz, Ozgur
This study was carried out to uncover the relationship between opercular girth (G(ope)), maximum girth (G(max)) and total length (TL) for eight fish species [(Sardina pilchardus (Walbaum, 1792), Sardinella aurita (Valenciennes, 1847), Serranus cabrilla (Linnaeus, 1758), Serranus scriba (Linnaeus, 1758), Symphodus mediterraneus (Linnaeus, 1758), Symphodus tinca (Linnaeus, 1758), Trachurus mediterraneus (Steindachner, 1868), and Trachurus trachurus (Linnaeus, 1758)] from four families (Carangidae, Clupeidae, Labridae, and Serranidae) sampled between August 2016 and December 2017 in Saros Bay (Northern Aegean Sea, Turkey). G(ope) and G(max) were found to increase linearly with the total length for all the species. All r(2) values were statistically significant (r(2) > 0.83, P < 0.001). The values about length-girth relationships (LGRs) of S. mediterraneus were estimated for the first time worldwide. This information will contribute to the development of ecosystem-based fisheries management.
Relationships Between Opercular Girth and Maximum Girth, Total Weight, Total Length of Atlantic Bonito (Sarda Sarda Bloch, 1793), Atlantic Mackerel (Scomber Scombrus Linnaeus, 1758) and Atlantic Chub Mackerel (Scomber Colias Gmelin, 1789) From Gallipoli Peninsula (Northern Aegean Sea, Turkey)
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2022) Cengiz, Ozgur; Parug, Senol
This study was carried out using dead fishes caught by commercial fishermen of Gallipoli Peninsula (northern Aegean Sea, Turkey)to find out length-girth and length-weight relationships of atlantic bonito (Sarda sarda Bloch, 1793), atlantic mackerel (Scomber scombrus Linnaeus, 1758) and atlantic chub mackerel (Scomber colias Gmelin, 1789) between January 2017 and December 2017. The length-weight relationships were estimated as W=0.0143TL2.84 (R2=0.89), W=0.0059TL3.11 (R2=0.92) and W=0.0059TL3.11 (R2=0.92) for Sarda sarda, Scomber scombrus and Scomber colias, respectively. The length-opercular girth relationships were calculated as Gope=0.3988TL+0.2512 (R2=0.78), Gope=0.3528TL+0.8122 (R2=0.84) and Gope=0.4295TL-0.5991 (R2=0.94), whereas the length-maximum girth relationships were determined to be Gmax=0.5993TL-4.1237 (R2=0.79), Gmax=0.4206TL+0.2732 (R2=0.83) and Gmax=0.4676TL-0.168 for Sarda sarda, Scomber scombrus and Scomber colias, respectively. The present study includes preliminary information on length-opercular girth and length-maximum girth relationships of these fish species for the Mediterranean Basin including Black Sea.
Relationships Between Opercular Girth, Maximum Girth, and Total Length of Six Sparid Fishes From Saros Bay (Northern Aegean Sea, Turkey): an Assessment for Ecosystem-Based Fisheries Management
(Univ Philippines Los Banos, 2022) Cengiz, Ozgur
This study was conducted so as to unearth the relationships between opercular girth (Gope), maximum girth (Gmax), and total length (TL) for six sparid fishes (Boops boops, Diplodus annularis, Diplodus puntazzo, Diplodus vulgaris, Lithognathus mormyrus, Oblada melanura) belonging to family Sparidae sampled between April 2015 and July 2016 in Saros Bay (Northern Aegean Sea, Turkey). Gope and Gmax were found to increase linearly with total length for all the species. All r(2) values were statistically significant (> 0.82, P < 0.001). This study reports the first information about length-girth relationships (LGRs) of Diplodus puntazzo for the Aegean sea. However, no LGRs estimates existed for Oblada melanura worldwide. These values are important for the selectivity of fishing gear so as to prevent the capture of younger, undersized, and immature individuals, it will assist the development of the ecosystem-based fisheries management.
A Risk Assessment on Occupational Health and Safety in Fishing Activities in Gevas District (Van, Turkiye) for Healthcare Management
(Arman Darya inc, 2023) Cengiz, Ozgur; Demir, Muhammet; Sepil, Ahmet; Seremet, Mehmet
In this study, the commercial fishing activities, which is one of the oldest professions, is categorized as the most dangerous profession both in the world and in Turkey due to the workplace and working conditions. Diseases and accident rates are high in the aforementioned occupational group. The current study was carried out by face-to-face survey method with fishermen from April 2022 to September 2022 and the "L type matrix" method to evaluate possible risk factors in fishing activities in Gevas district in terms of occupational health and safety. The important risk factors; "Having no training in occupational health and safety (OHS)", and "Fatigue from irregular and long working hours" affect on the working conditions of the fishermen. This research is the first for Gevas region and is expected to be a reference for future studies.
Some Biological Aspects of Bogue Boops Boops (Linnaeus, 1758) From Saros Bay (Northern Aegean Sea, Turkey)
(Western Philippines Univ, 2022) Cengiz, Ozgur
This study was conducted to determine the growth parameters, mortality and length at first maturity of bogue Boops boops (Linneaus, 1758) in Saros Bay (Northern Aegean Sea). A total of 363 specimens were obtained, monthly, from commercial fishermen between February 2016 and January 2017. The total length and weight of sampled fish ranged from 11.3 to 24.1 cm and from 16.61 to 165.32 g, with a mean of 16.9 cm and 60.40 g, respectively. The length-weight relationship was calculated as W = 0.0080TL(3,13). The von Bertalanffy growth equations were computed to be L-infinity = 27.9 cm, k = 0.21 year(-1), t(0) = -1.57 year. The growth performance index (Phi') was found as 2.21. The length at first maturity was estimated as 16.6 cm. Total mortality rate (Z), natural mortality rate (M), fishing mortality rate (F) and exploitation rate (E) of the bouge were 0.44 year(-1), 0.38 year(-1), 0.06 year(-1) and 0.13 year(-1), respectively. The present study provides preliminary information on the growth parameters, mortality and length at first maturity of B. boops for the Saros Bay (Northern Aegean Sea, Turkey).
Some Reproductive Characteristics of the Blotched Picarel Spicara Maena (Perciformes: Centracanthidae) From Saros Bay, Northern Aegean Sea, Turkey
(Univ Valparaiso, 2019) Cengiz, Ozgur
This study was carried out, monthly, in the Saros Bay (Northern Aegean Sea, Turkey) between January 2015 and December 2015. The gonadosomatic index (GSI) and absolute fecundity (F-a) of the blotched picarel (Spicara maena) were analyzed . The present study contributes to the reproductive biology of S. maena by reporting the first data about the fecundity of the species for the Aegean Sea.
Weight-Length Relationship and Maximum Length Record of Black Seabream (Spondyliosoma Cantharus Linnaeus, 1758) for Entire Aegean Sea and Turkish Waters
(Arman Darya inc, 2021) Cengiz, Ozgur
The present study was conducted between January 2020 and December 2020 off Saros Bay (Northern Aegean Sea, Turkey). A single specimen of Spondyliosoma cantharus with maximum length (41.0 cm in total length) and weight (1050.00 g in total weight) was caught by a commercial fisherman on 10 June 2020. Total length has been defined as the measurement taken from the anterior-most part of the fish to the end of the caudal fin rays when compressed dorso-ventrally. Total length of the fish sample was measured using the ruler on the measuring board. Photograph of the fish were taken with the ruler and the distance of 1 cm was taken as a scale in order to measure the total length precisely. The scientific name of the species was checked according to FishBase. The weight-length relationship was calculated as W = 0.0263TL(2.82) (R-2 = 0.95) for all samples. This study presents the maximum length and weight values of black seabream (Spondyliosoma cantharus Linnaeus, 1758) for entire Aegean Sea and Turkish Waters, up to the time.
Weight-Length Relationship and Reproduction of Bogue (Boops Boops Linnaeus, 1758) in Saros Bay (Northern Aegean Sea, Turkey)
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Cengiz, Ozgur; Parug, Sukru Senol; Kizilkaya, Bayram
This study was conducted between January 2014 and December 2015 in Saros Bay. The spawning period was estimated by monthly analyses. the changes of the gonad somatic index (GSI) using the equation: GSI = (Gonad Weight / Total Weight - Gonad Weight) x 100. The weight - length relationship was calculated using the equation W = aL(b). It was observed that spawning period occurred between March and May. The weight-length relationship was calculated as W = 0.008511(3.11) for females. W = 0.0095TL(3.07) for males.