Effects of mesh size and towing speed on the multispecies catch rates of historical swept area surveys

Manjarrés-Martínez, Luis M.; Gutiérrez‐Estrada, Juan Carlos; Hernando, J. A.

doi:10.1016/j.fishres.2014.11.006

Cited by 5 publications

(4 citation statements)

References 44 publications

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“…Results from a Danish trawl study even indicated that old, small vessels are more efficient than new, large ones [26], which may also be affected by e.g., skippers' experience [28]. Contradictory results indicate that the experiences of other fisheries are not simply transferrable, and specific problems require special studies [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Trawler Engine Size Had No Effect on Baltic Herring Size/Age Structure: An Experimental Study in the Gulf of Riga, Baltic Sea

Sepp

Vetemaa

Raid

et al. 2022

Fishes

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The Gulf of Riga stock of Baltic herring (Clupea harengus membras L.) has been maintained through several management tools. One such tool is the restriction of vessels’ main engine power (<221 kW). This restriction was implemented in the early 1990s and is based on the vessel types available in the area and on the assumption that the gear size used in trawl fishery depends on the vessel size (power). In the current study, we compared vessels with different engine powers using the same gears currently allowed in the gulf, to identify whether vessel power had any relation to catch structure. The results showed that engine power did not explain the differences in catch structure, which were more dependent on season and depth of water. Easing the power restriction of the trawl vessels in the Gulf of Riga will most likely not have a major negative impact on the sustainable management of the herring population. However, vessels with higher engine power should not use larger trawl gear than is currently used in the gulf.

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Section: Introductionmentioning

confidence: 99%

Trawler Engine Size Had No Effect on Baltic Herring Size/Age Structure: An Experimental Study in the Gulf of Riga, Baltic Sea

Sepp

Vetemaa

Raid

et al. 2022

Fishes

View full text Add to dashboard Cite

show abstract

“…By considering the negative impact of by-catch, people started to develop techniques that possibly reduce amount of by-catch significantly, such as selecting a fishing gear based on selectivity (Cooke and Wilde, 2007), modification (He, 2007), operation (Crawford et al, 2011;Gaspar and Chícharo, 2007;Manjarrés-Martínez et al, 2015) and community engagement (Hall et al, 2007). Various fishing gear-based methods have been developed to reduce unintended catch, such as longline (Løkkeborg, 1992), gillnet (Baremore et al, 2012) and traps (Stewart, 2007).…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of the Jones/Davis Type By-Catch Reduction Device (BRD) to Reduce Unintended Catch of Trawl Fisheries

Prasetyo¹,

Purwoko²,

Antoro³

2017

ACEH J ANIM SCI

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Reduction by-catch of commercial fishing is become a major concern, especially prawn trawl fisheries. By-catch reduction device developed to address that issue. However, there were trade-off problems regarding the implementation the BRD in trawl fisheries that is the effectiveness of the BRD. The performance of BRD was questionable on the effectiveness in term of reduction the by-catch and maintenance amount of target catch. This essay examines the performance of Jones-Davis type BRD to reduce by-catch and its impact on prawn catch in Cleveland Bay. An experimental fishing has been conducted (control-net and BRD-net; Pair-trawl method) to assess the effectiveness of by-catch reduction which examined with Wilcoxon Rank Test. The result shows that trawl equipped by BRD significantly reduce by-catch by 22.2% (Z =-4.6406, p-value = 0.0001) and retained prawn catch which was no significant difference in prawn catch between BRD and control nets (Z =-1.9218, p-value = 0.0546). Therefore, that evidence could be argued to convince about the BRD benefits to commercial prawn trawl fisheries.

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“…It is heavily used in biometry (Silvrio et al . ; Rivera‐Parra, Levin & Parker ; Manjarrs‐Martnez, Gutirrez‐Estrada & Hernando ), biostatistics (Silva et al . ) and medicine (Fagherazzi et al .…”

Section: Introductionmentioning

confidence: 99%

“…The generalisation of Klotz's test was considered by Karaman (2009 Mood's test is widely used in different areas for determining heterogeneity of variance. It is heavily used in biometry (Silvrio et al 2013;Rivera-Parra, Levin & Parker 2014; Manjarrs-Martnez, Gutirrez-Estrada & Hernando 2015), biostatistics (Silva et al 2012) and medicine (Fagherazzi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Generalisation of Mood's Test to Factorial Designs to Detect Heterogeneity of Variances

Karaman

Çene

2015

Aus NZ J of Statistics

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Mood's test, which is a relatively old test (and the oldest non-parametric test among those tests in its class) for determining heterogeneity of variance, is still being widely used in different areas such as biometry, biostatistics and medicine. Although it is a popular test, it is not suitable for use on a two-way factorial design. In this paper, Mood's test is generalised to the 2 × 2 factorial design setting and its performance is compared with that of Klotz's test. The power and robustness of these tests are examined in detail by means of a simulation study with 10,000 replications. Based on the simulation results, the generalised Mood's and Klotz's tests can especially be recommended in settings in which the parent distribution is symmetric. As an example application we analyse data from a multi-factor agricultural system that involves chilli peppers, nematodes and yellow nutsedge. This example dataset suggests that the performance of the generalised Mood test is in agreement with that of the generalised Klotz's test.

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Effects of mesh size and towing speed on the multispecies catch rates of historical swept area surveys

Cited by 5 publications

References 44 publications

Trawler Engine Size Had No Effect on Baltic Herring Size/Age Structure: An Experimental Study in the Gulf of Riga, Baltic Sea

Trawler Engine Size Had No Effect on Baltic Herring Size/Age Structure: An Experimental Study in the Gulf of Riga, Baltic Sea

The Effectiveness of the Jones/Davis Type By-Catch Reduction Device (BRD) to Reduce Unintended Catch of Trawl Fisheries

Generalisation of Mood's Test to Factorial Designs to Detect Heterogeneity of Variances

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