scholarly journals Catch per Unit Effort and Mortality Rates of Two Sparid Species, Pagellus acarne and Pagellus erythrinus from Bottom Trawl Fishery in Izmir Bay, Aegean Sea

2012 ◽  
Vol 11 (5) ◽  
pp. 681-686 ◽  
Author(s):  
Rasit Gurbet ◽  
Okan Akyol ◽  
Esin Yalcin
Keyword(s):  
Aegean Sea ◽  
Mortality Rates ◽  
Bottom Trawl ◽  
Catch Per Unit Effort ◽  
Izmir Bay ◽  
Trawl Fishery ◽  
Pagellus Erythrinus ◽  
Unit Effort

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 Catch per unit effort of coastal prawn trammel net fishery in Izmir Bay, Aegean Sea

2009 ◽  
Vol 10 (1) ◽  
pp. 19 ◽  
Author(s):  
O. AKYOL ◽  
T. CEYHAN
Keyword(s):  
Aegean Sea ◽  
Catch Per Unit Effort ◽  
Izmir Bay ◽  
Fishing Season ◽  
Unit Effort ◽  
The Mean ◽  
Second Period

Catch per unit effort (CPUE) data from the coastal trammel prawn net fishery was estimated from fishery-dependent surveys in Izmir Bay (Aegean Sea) during the 2004-2005 fishing season. Catches were sampled from 18 boats for a total of 170 landings, 60 landings from April to July (first period) and 110 landings from August to November (second period). The mean CPUEs were 2.56 ± 0.39 kg. 10 net unit-1 in the first period and 2.29 ± 0.20 kg. 10 net unit-1 in the second period, and not significantly different between periods (P>0.05).

scholarly journals The demersal fish composition and catch per unit effort of mini bottom trawl at the coast of Demak Regency Central Java

2021 ◽  
Vol 322 ◽  
pp. 03006
Author(s):  
Naliyana Fitriya ◽  
Nahlah Alfiatuunisa ◽  
Suwarman Partsuwiryo ◽  
Eko Setyobudi
Keyword(s):  
Demersal Fish ◽  
Bottom Trawl ◽  
North Coast ◽  
Catch Per Unit Effort ◽  
The North ◽  
Central Java ◽  
Unit Effort ◽  
Trichiurus Lepturus ◽  
Trawl Fishing ◽  
Trawl Catches

Demak is a coastal area on the North Coast of Java with a large enough potential for demersal fish resources. This research aimed to determine the composition, the length and weight distribution, and catch per unit effort (CPUE) of demersal fish caught using mini bottom trawl at the north coast of Demak Regency. The research was carried out in October-December 2020 by observation of ten trips of mini bottom trawl fishing. Each fish captured was then grouped by type, identified, and measured its length and weight. The result showed that 38 species consist of 31 fishes, four mollusks, and three crustaceans. The fish captured dominated by pony fish (Leiognathus equulus) as much as 31.23% and largehead hairtail (Trichiurus lepturus) of 23.52%. The catch per unit effort (CPUE) average of mini bottom trawl was 44.77 kg/trip. Mainly fish (more than 95%) caught in small size compared it’s the maximum attainable length (L-max), with all the weight ranges from 0.3 to 520 g and more than 98% sized 0.3-80 g. Mini bottom trawl catches many types of fish and small size; therefore, mini bottom trawl is classified as a type of fishing gear with a very low selectivity level.

scholarly journals Effect of hook and bait type on catch per unit effort in the Aegean Sea demersal longline fishery

2021 ◽  
Vol 38 (2) ◽  
pp. 181-188
Author(s):  
Ozan Soykan ◽  
Cemil Sağlam ◽  
İlker Aydın ◽  
Hasan Tuncay Kınacıgil
Keyword(s):  
Sparus Aurata ◽  
Length Distribution ◽  
Aegean Sea ◽  
Fishing Effort ◽  
Longline Fishery ◽  
Total Catch ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Catch Composition ◽  
The Impact

This study aimed to determine the impact of hook and bait type on the catch composition and catch per unit effort. Effects of hook and bait types on catch composition, catch per unit effort (CPUE), length and weight distributions in demersal longline fishery were determined by experimental surveys on demersal longline sets in the Aegean Sea. A total of 12 samplings corresponding to 4800 hook fishing effort were performed between April 2014 and September 2014. Two bait types; sardine (Sardina pilchardus) and grooved razor shell (Solen marginatus) and two hook types; J-hook and C-hook were tested. CPUE values were calculated for each species and assessed between different hook-bait combinations. A total of 623 individuals were captured belonging to 3 families and 9 species. It was found that more than 60% of total catch was captured by grooved razor shell and more than 50% of the total catch was caught with J type hook. J hook was found to be close to significant (p=0.06) and grooved razor shell was found significant (p=0.02) for CPUE. The effect of bait type was found to be more significant than that of hook type for CPUE and length distribution. Hook-bait combination differed according to species and C hook baited with sardine was determined to be the best combination for Sparus aurata as the most targeted fish in the study area. Discard ratio was calculated to be 34% in terms of weight and 42.5% in terms of total number of individuals for pooled data. The condition value (K) of the species ranged from 1.05 to 1.68 and differed according to bait type. Most of the high commercial value species caught with any hook-bait combination experimented within this study are larger than minimum fishing length according to minimum landing size regulations of Turkish fishery and maturity studies.

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.

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