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V. Maccarrone et al. / Turk. J. Fish. Aquat. Sci. 14: 173-181 (2014) 175
with extensive oceanic Posidonia meadow (Posidonia PPUE = Fishing prize x Kg species catch
oceanica) and host a wide variety of flora and fauna. 50 m net . hour
Artisanal fisheries are an important sector of the local
economy, and artisanal fishing has been practiced Advantage of Production (AP)
throughout the years in the waters surrounding the
islands. The AP was assessed by the Production Trend
(PT) attained after 29 hauls with each net (Figure 2).
Fishing Activity The PT was calculated by the sum of the incomes
from the sales of the products landed and sold (PPUE)
The data analysed in this study are part of a each day of fishing using the following equation:
study conducted in the island of Favignana with an
artisanal fishing vessel (overall length of 9 m, n
equipped with an inboard 130 kw Fiat Aifo engine),
which made daily fishing trips along the coast of the PTx PPUEi ,
island (Figure 1) (Buscaino et al, 2009). Two identical 1i
monofilament bottom gill nets were used during 29
fishing days. The nets, which were 900-m long and where the subscript n corresponds to the total
2.2-m high whit mesh size 11 (11 knot in 25 cm of number of hauls used to calculate the PT. Subtracting
stretched net, equivalent to 3.6 cm for each side of the PT of the control from that of the pinger net, it
mash), were denoted “pinger net” and “control net”. was possible to assess the Advantage of Production
The pinger net was equipped with 4 pingers (model (AP) of the pinger net with respect to the control net
DDD02; STM Ltd. Verona, Italy) positioned at a during the fishing days using the following equation:
regular distance of 300 meters. Each pinger had a cost
of 200 Euro. APi PTPi PTCTRLi ,
To conduct an economic analysis of the where the subscript P refer to the pingers net, the
effectiveness of pingers, the base data of the previous subscript CTRL refers to the control net, and the
study (Buscaino et al., 2009) , which is summarised in subscript i is the total number of hauls made up to the
Table 1, was used. ith fishing day.
Economic Evaluation of the Method used for
Catching
To examine the economic effect of using pingers Return on Investments
on the catch value, we considered the following
parameters: The difference of ROI of the "pingers"
technology for a fishing company was determined by
Gross Profit Per Unit Effort (PPUE) the AP values. The pinger net was equipped with four
pingers, which exhibited a total cost of 800 Euro. The
First, we assessed the economic value of each of cost to equip a net with pingers has been standardised
the 26 species caught based on the value of the fish and expressed in the number of Euros per 50 m of net.
landed and sold (Euro/kg) during the study performed The point of intersection between the costs of the
by Buscaino et al. (2009) (taking the local market pingers and the trendline of the AP allowed us to
price in 2006) (Table 2). estimate the number of fishing days required to reach
the break-even point between the technology
Based on the weight and species of fish caught, investment and the AP.
the gross Profit per Unit Effort (PPUE), expressed as
amount of Euros per the haul from 50 meters of each Moreover, we evaluated the difference of ROI
net (Brotons, 2008), was measured as the following considering the economic incentive of the European
equation (Figure 2): Fisheries Fund (EFF) provided by the European
Table 1. Base data used in this study
Equipment and Data Specification
2 Gill Nets
Each net was 900-m long and 2.2-m high with mesh size of 11 mm
Pinger Cost for each net = 900 € (unpublished data)
4 pinger = 800 Euro (only the pinger net)
Fishing Data
Holes and Tears (model DDD02; STM Ltd., Verona, Italy)
Dolphin Interactions Amount of fish captured (kg/h × 900 m set net) per species with the control and pinger nets (see
Table 1)
Amount and size of the holes and tears in the control and pinger nets (see Fig. 4)
Dolphin presence around the fishing nets in each haul (see Fig. 3)
