Interacción entre la pesquería del bacalao de profundidad, Dissostichus eleginoides (Nototheniidae), con el cachalote y la orca en el sur de Chile: revisión del estado de conocimiento

Cáceres, Benjamín; Aguayo‐Lobo, Anelio; Acevedo, Jorge

doi:10.4067/s0718-686x2016000300003

Cited by 4 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the highest capture in fishing gear during the fishing operation offshore delivered a quite different outcome compared with strandings on shore, with the common dolphin with 56 individuals and the dusky dolphin with 19 being the species with the highest entanglement rates [54] (IFOP, 2020). Because cetacean populations and fishing activities coincide in the same geographic areas, interactions between the two are inevitable; the removal of fish from the gear during the fishing activity by marine mammals increases the chances of being injured or even killed due to bycatch [55] (Cáceres, 2016).…”

Section: Discussionmentioning

confidence: 99%

Contribution to the Knowledge of Cetacean Strandings in Chile between 2015 and 2020

Ulloa,

Rivero,

Fernández

2024

Oceans

View full text Add to dashboard Cite

Strandings caused by anthropogenic factors are one of the most worrying threats in relation to the conservation of cetacean species, and in the case of Chile, due to its geography and large extension of the coastline, monitoring and access to these events is difficult, making their study more complex. Chile has a shortage of specialized scientific forensic research facilities for cetaceans; however, for this study, it was able to collect data recorded from official institutions and sporadic scientific biological sampling oriented to investigate the causes of death or stranding. According to the Chilean government official database, we described that the main causes of unusual mortality events (UME) and mass strandings from 2015 and 2016 were acute poisoning by biotoxins and strandings by multiple possible causes, respectively, while individual strandings would have their causes in anthropogenic activities, such as entanglements in fishing and aquaculture gears and collisions with vessels. The predominant species in mass strandings was the sei whale (Balaenoptera borealis). The geographical area of greatest prominence in mass strandings was the Aysén Region in the Central Patagonia of Chile, while the species mostly involved in individual strandings along the south-central, central, and northern coasts of Chile was the small porpoise (Phocoena spinipinnis). The most common gross pathological findings were advance decay of the carcasses and non-specific wounds of different natures.

show abstract

Section: Discussionmentioning

confidence: 99%

Contribution to the Knowledge of Cetacean Strandings in Chile between 2015 and 2020

Ulloa,

Rivero,

Fernández

2024

Oceans

View full text Add to dashboard Cite

show abstract

“…With respect to entanglements, the data obtained showed that the species found entangled range from small, toothed cetaceans (14/33) to large, toothed whales and mysticetes (19/33), which makes both figures quite similar, nevertheless most of the entangled animals die in the open sea and no more than 10% beaches ashore so this proportion may have an important bias. It remains to be analyzed what is the risks involved in certain types of nets, such as snook nets or lines for cod capture (Cáceres, 2016), for mysticetes and large toothed whales such as sperm whales.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, indirect interactions (also known as biological or ecological) are those in which both marine mammals and the fishing industry compete for fish species (Obusan et al, 2016). Because cetacean populations and fishing activities coincide in the same geographic areas, interactions between the two are inevitable; removal of fish from the gear during the fishing activity by marine mammals increases the chances of being injured or even killed due to bycatch (Cáceres, 2016) ʺGhost fishing,ʺ referrin g to g ill nets or traps th at h av e been lo st or abandoned, represents an ongoing problem due to the continuous entanglement of marine animals that get stuck in them and die. In recent years, this has worsened due to the introduction of highly durable synthetic equipment.…”

Section: Probable Causes Of Strandings In Chilementioning

confidence: 99%

Contribution to the Knowledge of Cetacean Strandings in Chile Between Years 2015 and 2020

Ulloa

2023

Preprint

View full text Add to dashboard Cite

Strandings are one of the most worrying issues in relation to the conservation of cetacean species, and in the case of Chile, due to its geography and large extension of the coastline, monitoring and access to these events is difficult, making their study more complex. Chile has a shortage of specialized scientific forensic research facilities for cetacean; however, for this study it was able to collect data recorded from official institutions and sporadic scientific biological sampling oriented to investigate the causes of death or stranding. According to the Chilean government official database, we described that the main causes of unusual mortality events (UME) and mass strandings from year 2015 and 2016 were acute poisoning by biotoxin and trauma to the auditory complex, respectively, while individual strandings would have their causes in anthropogenic activities such as entanglements in fishing an aquaculture gear and collisions with vessels. The predominant species in mass strandings was the sei whale (Balaenoptera borealis). The geographical area of greatest prominence in mass strandings was the Aysén Region in the Central Patagonia of Chile, while the species mostly involved in individual strandings along the south-central, central, and northern coast of Chile was the small porpoise (Phocoena spinipinnis). The most common gross pathological findings were advance decay of the carcasses and nonspecific wounds of different nature, difficult to associate with possible causes of death without further histopathological studies.

show abstract

“…The Patagonian toothfish Dissostichus eleginoides Smitt, 1898 is an abysso-benthic species whose bathymetric distribution fluctuates between 80 and 2500 m in depth (Collins et al, 2010;Cáceres et al, 2016) with broad circumpolar biogeography, spreading to the southeastern Pacific (Arana et al, 1994;Murillo et al, 2008;Collins et al, 2010;Aramayo, 2016), and Occidental and southwestern Atlantic (Miller, 1993;Nelson et al, 2016). Collins et al (2010) suggested that species distribution is conditioned by age, and adult and juvenile populations appear to be separated.…”

Section: Introductionmentioning

confidence: 99%

Gross morphology of the cephalic sensory canal pores in Patagonian toothfish Dissostichus eleginoides Smitt, 1898 from southern Chile (Perciformes: Nototheniidae)

Sáez¹,

Jaramillo²,

Vargas‐Chacoff

2020

Lat. Am. J. Aquat. Res.

View full text Add to dashboard Cite

This study describes the cephalic sensory canal pores of the Patagonian toothfish's juvenile and adult specimens (Dissostichus eleginoides) from southern Chile. Specimens exhibited four supraorbital, eight infraorbital, and five mandibular pores, followed by six preoperculars, one coronal pore, one supratemporal pore, and four temporal pores. Juveniles exhibited circular pores in the mandibular, infraorbital, and preopercular region. The first two supraorbital pores are circular, the third is rectangular, and the fourth triangular. The coronal pore is circular with a bifurcation; the supratemporal pore is rectangular. In adults, the first mandibular canal pore is circular, and the last four are elongated. The preopercular canal pores are elongated. The two first supraorbital canal pores are circular, unlike the third and fourth, which are rectangular. The coronal pore is rectangular without bifurcation, and the supratemporal pore has a T-shape. The jaw of juveniles does not present all mandibular canal pores; in the infraorbital region, the first five pores extend as a thin canaliculus, while the adjacent pores appear as longer canaliculi in adults. The differences could be related to changes in spatial distribution during larval, juvenile, and adult stages. Adult cephalic sensory canal pores may have an important role in detecting vibratory waves allowing them to capture their prey and perceive potential predators. Our results provide information regarding the cephalic sensory canal pores of the Patagonian toothfish that may stimulate future studies of this species' mechanosensory system.

show abstract

Interacción entre la pesquería del bacalao de profundidad, Dissostichus eleginoides (Nototheniidae), con el cachalote y la orca en el sur de Chile: revisión del estado de conocimiento

Cited by 4 publications

References 21 publications

Contribution to the Knowledge of Cetacean Strandings in Chile between 2015 and 2020

Contribution to the Knowledge of Cetacean Strandings in Chile between 2015 and 2020

Contribution to the Knowledge of Cetacean Strandings in Chile Between Years 2015 and 2020

Gross morphology of the cephalic sensory canal pores in Patagonian toothfish Dissostichus eleginoides Smitt, 1898 from southern Chile (Perciformes: Nototheniidae)

Contact Info

Product

Resources

About