Discards in bottom trawl fishery in the Aegean Sea (Izmir Bay, Turkey)

2013 ◽  
Vol 29 (6) ◽  
pp. 1269-1274 ◽  
Author(s):  
R. Gurbet ◽  
O. Akyol ◽  
E. Yalçın ◽  
O. Özaydın
Keyword(s):  
Aegean Sea ◽  
Bottom Trawl ◽  
Izmir Bay ◽  
Trawl Fishery

scholarly journals Using guarding net to reduce regularly discarded invertebrates in trammel net fisheries operating on seagrass meadows (Posidonia oceanica) in Izmir Bay (Eastern Aegean Sea)

2013 ◽  
Vol 14 (2) ◽  
pp. 282 ◽  
Author(s):  
I. AYDIN ◽  
G. GOKCE ◽  
C. METIN
Keyword(s):  
Aegean Sea ◽  
Posidonia Oceanica ◽  
Control Group ◽  
Izmir Bay ◽  
Trawl Fishery ◽  
Seagrass Meadows ◽  
Hexaplex Trunculus ◽  
Eastern Aegean ◽  
Sea Grass ◽  
Lead Line

Prohibition of both beach and boat seines and trawl fishery along the İzmir Bay coasts in the Aegean Sea signifies intensive usage of gillnets and trammel nets, for catching red mullet (Mullus spp.) species in particular. Trials were realized between March 2009 and February 2010 with trammel nets in the areas on the boundaries of the sea grass (Posidonia oceanica) meadows in the Bay. Guarding net (selvedge) was attached to the lead line of experimental nets (Exp1-Exp2) - 36 and 40 mm inner panel. Differences for discard amounts between control group nets (C1-C2) (having the same inner panel as the experimental nets), used by commercial fishermen, and experimental nets are 54.7% for C1-Exp1 and 62.8% for C2-Exp2 (p<0.05). Use of nets with selvedge not only reduced regularly discarded invertebrates (Hexaplex trunculus, Bolinus brandaris, Maja spp.) in the region, but also avoided net damage caused by these species.

scholarly journals Age and growth of four-spotted megrim (Lepidorhombus boscii Risso, 1810) from Saros Bay (Northern Aegean Sea, Turkey)

2013 ◽  
Vol 14 (1) ◽  
pp. 36 ◽  
Author(s):  
O. CENGIZ ◽  
U. OZEKINCI ◽  
A. ISMEN ◽  
A. OZTEKIN
Keyword(s):  
Sex Ratio ◽  
Growth Performance ◽  
Performance Index ◽  
Growth Parameters ◽  
Aegean Sea ◽  
Bottom Trawl ◽  
Age And Growth ◽  
Trawl Fishery ◽  
Northern Aegean Sea

In this study, the growth parameters of the four-spotted megrim, (Lepidorhombus boscii Risso, 1810), were studied in Saros Bay, which had been closed to bottom trawl fishery since 2000. The sex ratio of females to males was 1:0.42. Length-weight relationships were W=0.0032L3.31 and W=0.0069L3.04 for females and males, respectively. Growth parameters of the populations were L∞=49.8 cm, k=0.09 year-1, t0=-2.15 year for females; L∞=39.1 cm, k=0.11 year-1, t0=-2.59 year for males. The growth performance index (Φ’) was found to be 2.35 and 2.23 for females and males, respectively.

scholarly journals Assessment of goatfish fisheries in Turkey based on the microdata set of official landing statistics

2021 ◽  
Vol 38 (3) ◽  
pp. 303-309
Author(s):  
Nuray Çelik Mavruk ◽  
Sinan Mavruk ◽  
Dursun Avşar
Keyword(s):  
Mediterranean Sea ◽  
Black Sea ◽  
Large Scale ◽  
Aegean Sea ◽  
Bottom Trawl ◽  
The Black Sea ◽  
Marmara Sea ◽  
Trawl Fishery ◽  
Red Mullet ◽  
The Mediterranean

Although goatfishes (Mullidae Rafinesque, 1815) are among the most important commercial fishes in Turkey, no research has been found investigating the characteristics and spatial patterns of goatfish fishery. Here, we assessed the goatfish fishery of Turkey based on the microdata set of Turkish National Fishery Statistics gathered by Turkish Statistical Institute (TÜİK) between 2014 and 2017. In this context, we investigated the variation of total goatfish catch by cities. In addition, we compared the contribution of small (boat <10m) and large scale (boat >10m) fishers as well as different fishing techniques to the total goatfish catch in Turkey. Finally, an evaluation was made on the discard rates recorded in the official landing statistics. The results showed that higher red mullet (Mullus barbatus Linnaeus, 1758) catch was reported in the eastern Mediterranean, whereas surmullet (Mullus surmuletus Linnaeus, 1758) catch was significantly higher in the western Black Sea. On the other hand, fishery-independent investigations revealed that the Turkish fishery fleet mostly catches red mullet throughout the coasts of Turkey. Therefore, the separate records of red mullet and surmullet in the landing statistics likely represent the local names of red mullet rather than two different species. Large scale fishers were the main source of fishery pressure in the Mediterranean Sea, the Aegean Sea and the Black Sea. However, the majority of the catch was landed by small scale fishers in the Marmara Sea. The bottom trawl fishery landed 88, 92 and 87% of total goatfish catch in the Black Sea, the Aegean Sea and the Mediterranean Sea, respectively. Purse seiners provided the largest part of total goatfish catch (40%) in the Marmara Sea, where the bottom trawl fishery is prohibited. The overall average for the discard rate was found to be 0.47%. There were no statistically significant differences among the discard rates of two species, marine regions or fishing methods.

scholarly journals Preliminary evaluation of landings and discards of the Turkish bottom trawl fishery in the northeastern Aegean Sea (eastern Mediterranean)

2014 ◽  
Vol 78 (2) ◽  
pp. 213-225 ◽  
Author(s):  
Çetin Keskin ◽  
Francesc Ordines ◽  
Celal Ates ◽  
Joan Moranta ◽  
Enric Massutí
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Bottom Trawl ◽  
Preliminary Evaluation ◽  
Trawl Fishery
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