Species composition and temporal variation of prawn trawl bycatch in the Joseph Bonaparte Gulf, northwestern Australia

Tonks, Mark; Griffiths, Shane P.; Heales, D.S.; Brewer, D.T.; Dell, Q.

doi:10.1016/j.fishres.2007.09.007

Cited by 39 publications

(25 citation statements)

References 31 publications

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“…Both the two previous studies used year-round data from a research vessel, however, Ye et al (2000) excluded Kuwait Bay, a no-fishing area with very high bycatch-to-shrimp ratio, and the high ratio summer season, gave a more realistic ratio for the shrimp fishery. Our estimated bycatch-to-shrimp ratio is also close to that (13:1) of the prawn fishery in northwestern Australia (Tonks et al, 2008).…”

Section: Estimates Of Annual Retained and Discarded Bycatches For Thesupporting

confidence: 81%

“…Although the resulting total bycatch species (112) is comparatively lower than that reported in a tropical Australian penaeid fishery (350 species of teleosts and elasmobranchs) (Stobutzki et al, 2001) and that (195 taxa from 85 families) of prawn trawl bycatch in northwestern Australia (Tonks et al, 2008), it is similar or higher than the total species reported in this area from both bycatch of the shrimp trawling (95 species) (Al-Ayoub et al, 2005) and catches from other surveys. For example, the total reported species was 92 for hadrah (intertidal stake) (unpublished data), 70 for gargoor (cage type fish trap) (Chen et al, 2012).…”

Section: Estimates Of Annual Retained and Discarded Bycatches For Thementioning

confidence: 48%

“…Kuwait's shrimp fishery targets three species: Penaeus semisulcatus, Metapenaeus affinis, Parapenaeopsis stylifera, and usually, more than 50% of catch is P. semisulcatus. Similar to other tropical and sub-tropical shrimp trawl fisheries (Stobutzki et al, 2001;Tonks, et al, 2008;Davies, et al, 2009), Kuwait's shrimp fishery also captures large quantities of bycatch (as high as 35,000-55,500 t) every year. These bycatches were mostly dumped at the sea with little (<2%) retained (Ye et al, 2000), resulting in a huge quantity of wasted food resources and killing large number juveniles of commercial species.…”

Section: Introductionmentioning

confidence: 99%

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Retained and Discarded Bycatch from Kuwait’s Shrimp Fishery

Chen

Almatar²,

Al-Saffar³

et al. 2012

AST

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The quantity and species compositions of both retained and discarded bycatch of the Kuwait's shrimp fishery was investigated for the first time directly through onboard observation and sampling of a fishing vessel. The observations were conducted on a 131 tonne double-rigged shrimp trawler twice a month during the shrimp season from September 2010 through January 2011. The shrimp catch rate declined sharply from 19.6 to 1.1 kg/h as the season progressing, while bycatch rate remained in a high and relatively stable between Aquatic Science and Technology ISSN 2168-9148 2013 www.macrothink.org/ast 87 106 and 81.5 kg/h, and resulted in a large variation (5.4-73.6) of byatch-to-shrimp ratio from the season's start to the season end. The retained bycatch was always low (11.6-15.9% of the total bycatch) throughout the season. The total species recorded in the bycatch was 112, with 55 retained and 93 discarded at sea. Thirty-nine species occurred both in retained and discarded bycatches. Saurida tumbil, Nematalosa nasus, Sphyraena flavicauda, Acanthopagrus latus and Otolithes ruber were the most dominant fish species in the retained bycatch. Discards dominated both by undersized commercially valuable species including Ilisha melastoma, Pomadasys stridens, Nematalosa nasus, Saurida tumbil and Upeneus doriae, and by non-commercial species such as catfishes, sharks and rays. Based on monthly bycatch-to-shrimp ratio, the percentage of the retained bycatch and the recorded shrimp landings, the total bycatch of Kuwait's shrimp fishery was estimated to be 15,704 t for the 2010/11 season. Of the total bycatch, only 2192 t (14%) was retained, while the majority 13, 512 t (86%) was discarded at sea. Of the 93 discarded species, 55 are commercially valuable species, representing 61% (8242 t) of the total discarded bycatch.

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Section: Estimates Of Annual Retained and Discarded Bycatches For Thesupporting

confidence: 81%

Section: Estimates Of Annual Retained and Discarded Bycatches For Thementioning

confidence: 48%

Section: Introductionmentioning

confidence: 99%

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Retained and Discarded Bycatch from Kuwait’s Shrimp Fishery

Chen

Almatar²,

Al-Saffar³

et al. 2012

AST

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“…Batrachomoeus trispinosus is a tropical euryhaline species, ranging from 0 to 36 m in depth in fresh and saltwater habitats throughout the tropical western Pacific (Greenfield, 1999). Based on specimens collected in trawls, individuals appear to occur in low densities within estuarine environments (Hajisamae et al, 2006;Tonks et al, 2008). Despite this lack of knowledge of B. trispinosus in the wild, they have become popular in the aquarium trade, appearing under a variety of (often misleading) names such as frogfish, lionfish or Halophryne trispinosus (Norman, 1976).…”

Section: Introductionmentioning

confidence: 99%

Novel vocal repertoire and paired swimbladders of the three-spined toadfish,Batrachomoeus trispinosus: insights into the diversity of the Batrachoididae

Rice

Bass

2009

Journal of Experimental Biology

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SUMMARYToadfishes (Teleostei: Batrachoididae) are one of the best-studied groups for understanding vocal communication in fishes. However, sounds have only been recorded from a low proportion of taxa within the family. Here, we used quantitative bioacoustic, morphological and phylogenetic methods to characterize vocal behavior and mechanisms in the three-spined toadfish, Batrachomoeus trispinosus. B. trispinosus produced two types of sound: long-duration 'hoots' and short-duration 'grunts' that were multiharmonic, amplitude and frequency modulated, with a dominant frequency below 1 kHz. Grunts and hoots formed four major classes of calls. Hoots were typically produced in succession as trains, while grunts occurred either singly or as grunt trains. Aside from hoot trains, grunts and grunt trains, a fourth class of calls consisted of single grunts with acoustic beats, apparently not previously reported for individuals from any teleost taxon. Beats typically had a predominant frequency around 2 kHz with a beat frequency around 300 Hz. Vocalizations also exhibited diel and lunar periodicities. Spectrographic crosscorrelation and principal coordinates analysis of hoots from five other toadfish species revealed that B. trispinosus hoots were distinct. Unlike any other reported fish, B. trispinosus had a bilaterally divided swimbladder, forming two separate swimbladders. Phylogenetic analysis suggested B. trispinosus was a relatively basal batrachoidid, and the swimbladder and acoustic beats were independently derived. The swimbladder in B. trispinosus demonstrates that toadfishes have undergone a diversification of peripheral sonic mechanisms, which may be responsible for the concomitant innovations in vocal communication, namely the individual production of acoustic beats as reported in some tetrapods. Supplementary material available online at

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“…Although these species may not occur commonly, it may be difficult to take mitigating measures (Hall, 1996;Hall et al, 2000). In many cases, especially in crustacean trawl fisheries, the problem is that the bycatch represents the highest proportion of the catch (Saila, 1983;Andrew and Pepperell, 1992;Stobutzki et al, 2001;Manjarrés et al, 2008;Tonks et al, 2008;Góngora et al, 2009).…”

Section: Introductionmentioning

confidence: 99%