Dip Solungaç Ağlarında Afalina (Tursiops truncatus) Yunuslar İçin Kullanılan Yunus Kovucu Cihazların İncelenmesi ve Ekonomik Performansı

Year 2019, Volume: 50 Issue: 1, 84 - 91, 30.01.2019

Sedat Gönener , Uğur Özsandıkçı

https://doi.org/10.17097/ataunizfd.433660

Cited By: 1

Abstract

Bu çalışma Sinop liman bölgesinde Eylül 2015 ve
Ocak 2017 periyodu içerisinde her ay cihaz kullanan ve kullanmayan
balıkçılardan veriler alınarak, dip uzatma ağlarına yunus kovucu cihazlar
(pinger) takılmasının akılcı bir uygulama olup olmadığını belirlemek amacıyla
yapılmıştır. Balıkçıların kullandıkları fanyasız dip uzatma ağlarının göz
açıklığı 34 mm, uzunlukları 1,1 km’dir. Cihazlı ağlarda kullanılan yunus kovucu
cihazların frekansı 1-500 kHz olup, etkili mesafeleri 200m’dir. Cihazların şarj
edilebilir ve total ömrünün 2-2,5 ay olması ayırt edilebilir özelliğidir.
Cihazlı ağlarda (Eylül-Aralık 2015) ilk dört aylık dönemde ortalama 15,34±1,22
kg olan av miktarının ikinci (Ocak 2016-2017) dönem de yaklaşık %56 oranda
azalarak 6,83±0,31 kg a düşmesi çalışmanın önemli bulguları arasında yer
almaktadır. Her iki ağ grubuna ait diğer bulgulara göre birim çabada av miktarı
cihazlı ağlarda 0,67±0,02 kgkms-1, kontrol ağlarda ise 0,63±0,02 kgkms-1 olarak
gerçekleşmiştir. Avlanan balıklardan elde edilen toplam gelir cihazlı ağlarda
22.259,65 TL, kontrol ağlarda ise 20.880,90 TL olarak hesaplanmıştır. Ağlardaki
hasar-donatım durumuna ve özellikle (2 adetx1500 TL) yunus kovucu cihaz alımına
bağlı olarak değişiklik gösteren giderler; cihazlı ağlar için 6400 TL’na
ulaşırken, kontrol ağlar için 4000 TL olarak hesaplanmıştır. Buna göre avlama
yapılan periyodda cihazlı ağlardan elde edilen net gelirin 15.859,65 TL olduğu
hesaplanırken, kontrol ağlardan elde edilen net gelirin bundan %6 daha fazla
gerçekleşerek 16.879,90 TL olduğu belirlenmiştir. Sonuç olarak çalışmada
kullanılan yunus kovucu cihazların bölgedeki balıkçı tarafından kullanılmasının
önerilmesi mümkün görünmemektedir.

Keywords

Karadeniz, Dip solungaç ağı, Yunus kovucu cihaz, Etkileşim, Ekonomik performans

Investigation and Economic Performance of Acoustic Detterent Devices Used in Bottom Gillnets (Pingers) for Bottlenose Dolphin (Tursiops truncatus)

Abstract

The study was performed in Sinop between
September 2015-January 2017 to investigate whether it is a profitable
application to attach pinger devices to bottom-gillnets used in coastal
fisheries. Gear specifications of both fishermen group were same as follows;
mesh size: 34 mm, length: app. 1,1km. The frequency range of the pinger device
is 1–500 kHz and effective up to 200m. The most important distinctive feature
of those devices is having a built-in rechargeable 1,6 Ah NiMH battery pack but
limited up to 2-2,5 months (1000-1500h) total lifetime. In experimental group; average
fish catch in the first periods (September-December 2015) was 15,34±1,22 kg and
it decreased by 56% to 6,83±0,31 kg between January 2016–2017. According to
results obtained from both control and experimental group, Catch Per Unit
Effort (CPUE) was calculated as 0,63±0,02 kgkms-1 and 0,67±0,02 kgkms-1,
respectively. Total incomes from the sale of fish were 20880,90 TL and 22259,65
TL for control and experimental groups. The fishermen in control group spent
4000 TL to repair nets damaged due to dolphin presence while other fishermen
spent 3400 TL to repair nets. Considering the device expenses for the
experimental group (2x1500 TL), total cost was calculated as 6400 TL for
experimental group and 4000 TL for control group. Therefore, net income was calculated
as 16879,90 TL in control group while it decreased to 15859,65 TL in
experimental group, representing 6% decline.

Keywords

Black Sea, Bottom gillnet, Pinger, Interaction, Economic performance

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