Habitat utilization by fishes in a shallow, semi-enclosed estuarine bay in southern Gulf of Thailand

Hajısamae, Sukree; Yeesin, Pun; Chaimongkol, Saweit

doi:10.1016/j.ecss.2006.03.020

Cited by 40 publications

(29 citation statements)

References 35 publications

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“…Zooplanktivorous fish and sergestid shrimps appear to be the major route of transfer of energy from detritus to spadenose sharks (this study), while bamboo sharks assimilated detrital carbon via consumption of benthic polychaetes and small crustaceans (Wai et al 2011a). Similar prey taxa are abundant in estuaries over the world (Wantiez et al 1996, Rhodes 1998, Hajisamae et al 2006, and may represent an important medium for transfer of allochthonous detrital carbon from the land to marine predators in other estuarine ecosystems. Notes: For (1), degrees of freedom (df ) for size and residual are 4 and 109, respectively (except the LSI residual which is 90); LSI of pups was not available.…”

Section: Resultsmentioning

confidence: 75%

Monsoons and habitat influence trophic pathways and the importance of terrestrial‐marine linkages for estuary sharks

Wai¹,

Yeung²,

Lam³

et al. 2012

Ecosphere

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Abstract. Tropical estuaries often receive enhanced fluxes of terrestrial derived organic matter and phytoplankton during the wet season, and such monsoonal events may significantly influence the trophic dynamics of these systems. This study examined spatio-temporal terrestrial-marine linkages in a tropical estuary, the Pearl River Estuary (PRE), southern China, by investigating trophic pathways leading to estuary sharks. We investigated spatial (inshore vs. offshore) and seasonal (wet vs. dry season) variation in the relative importance of terrestrial-and marine-derived carbon, so as to assess the contribution of detrital pathways to the pelagic spadenose shark, Scoliodon laticaudus; ontogentic changes in shark diets were also documented. Stable isotope analyses (SIA) and fatty acid (FA) profiling indicated that spadenose sharks assimilated both marine and terrestrial carbon via consumption of zooplantivorous fish and shrimps. Detrital carbon sources were more important to juvenile and pre-mature sharks at inshore locations, especially during the wet season when river discharge increased and terrestrial detritus was more abundant. Ontogenetic dietary shifts were evident: juvenile and pre-mature sharks had significantly higher levels of bacterial (detrital) FA than adults which contained more animal-derived FA. Inshore sharks, with more depleted d 13 C signatures, relied more on terrestrial carbon than sharks offshore. Comparison of spadenose shark FA profiles with those of the sympatric, white-spotted bamboo shark (Chiloscyllium plagiosum)-a benthic predator that acquires detrital carbon via consumption of polychaetes and crustaceans-revealed that they made greater use of detrital carbon sources. However, spadenose sharks in the inner estuary assimilated higher proportions of terrestrial detritus (44-56%) than bamboo sharks (31-45%). The importance of terrestrial detritus for both shark species demonstrated the important contribution of terrestrial detritus to both pelagic and benthic food webs in the PRE. Terrestrial-marine linkages are therefore of great significance, particularly during the wet season, in this estuarine system, which serves as feeding and nursery grounds for both shark species, and trophic subsidies from land are likely to be important for marine predators in other tropical estuaries.

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Section: Resultsmentioning

confidence: 75%

Monsoons and habitat influence trophic pathways and the importance of terrestrial‐marine linkages for estuary sharks

Wai¹,

Yeung²,

Lam³

et al. 2012

Ecosphere

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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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“…The water regime is complex, with tidal influences from the Gulf of Thailand, run-off from the landward side and water drains from the two major rivers, Pattani and Yamu Rivers. Average water depth is between 0.2-1.5m with the maximum of 5m at the bay mouth and deeper gradually outside the bay (Hajisamae et al, 2006). There have both natural and replanted (estimated at 900ha), are found in the east of the area.…”

Section: Study Area Descriptionmentioning

confidence: 99%

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Fazrul¹,

Hajısamae²,

Ikhwanuddin³

et al. 2015

Turk. J. Fish. Aquat. Sci.

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This study assessed bycatch composition and some factors affected assemblage from blue swimming crab fisheries in semi-enclosed Pattani Bay and offshore area, the Gulf of Thailand. Samples were collected from May 2013 to September 2014 by using crab gill net. One hundred seventy four of bycatches were found within proportion of 52.2% in the bay and 49.5% from offshore. Moreover, discarded species from the bay and offshore were 26.3% and 47.1%, respectively. The most dominant species in the bay was horse shoe crab (Carcinoscorpius rotundicauda) while offshore was scaly whipray (Himantura imbricate). Abundance of bycatch in the bay was affected both by habitat (P<0.005) and season (P<0.001) while abundance from offshore was affected only by season (P<0.05). Species richness of bycatch both in the bay and offshore were influenced significantly by season (P<0.001 and P<0.005, respectively). The most abundance bycatch in the bay was found in the inner bay while at 15m depth for offshore. The result of nMDS ordination indicated a separation of three major groups of assemblage in the bay; inner, middle and outer bay but there was no obvious segregation from offshore.

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Habitat utilization by fishes in a shallow, semi-enclosed estuarine bay in southern Gulf of Thailand

Cited by 40 publications

References 35 publications

Monsoons and habitat influence trophic pathways and the importance of terrestrial‐marine linkages for estuary sharks

Monsoons and habitat influence trophic pathways and the importance of terrestrial‐marine linkages for estuary sharks

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

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