Lagocephalus sceleratus Impact on Fisheries

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Questions and Answers

What percentage of the fish had their stomachs less than half full?

45% (correct)

30%

24%

What was the most common taxon found among crustaceans in the examined stomachs?

Shrimp

Lobsters

Small crabs (correct)

Krill

Which species was found most frequently as prey among the Tetraodontidae species?

L. sceleratus (correct)

T. flavimaculosus

Pterois miles

Siganus spp.

What percentage of L. sceleratus had consumed non-indigenous species?

6% Signup and view all the answers

What was the primary type of remains found in the stomachs classified as cephalopods?

Squid Signup and view all the answers

In the analysis, what was the vacuity coefficient for additional L. sceleratus stomachs examined?

23.5 Signup and view all the answers

Which of the following was NOT identified as a food item in the fish stomachs analyzed?

Sea turtles Signup and view all the answers

What was an indicator that some individuals were digging into the seafloor for food?

Presence of sand in the stomach Signup and view all the answers

What environmental condition does Lagocephalus sceleratus show high adaptability to?

Varied salinity levels Signup and view all the answers

Which of the following is a unique feature of Lagocephalus sceleratus that aids in its defense against predators?

Ability to puff up Signup and view all the answers

What primary predator has been documented preying on adult Lagocephalus sceleratus?

Loggerhead turtle Signup and view all the answers

What is a significant characteristic of the stomach of pufferfish, including Lagocephalus sceleratus?

It can increase its size significantly. Signup and view all the answers

What type of toxin is primarily found in the tissues of Lagocephalus sceleratus?

Tetrodotoxin Signup and view all the answers

Which bodily feature of Lagocephalus sceleratus contributes to its ability to puff up?

Flexible skin and distensible stomach Signup and view all the answers

What happens to some predators that ingest pufferfish like Lagocephalus sceleratus?

They can perish from asphyxiation. Signup and view all the answers

Where is the northernmost occurrence of Lagocephalus sceleratus found?

Black Sea Signup and view all the answers

What is Lagocephalus sceleratus commonly known as?

Silver-cheeked pufferfish Signup and view all the answers

Which of the following publications discusses the genetics of Lessepsian bioinvasions?

The genetics of Lessepsian bioinvasions Signup and view all the answers

What is the potential impact of Lagocephalus sceleratus on marine biodiversity?

Decreasing biodiversity through competition Signup and view all the answers

Where was the first large-scale stock assessment of Lagocephalus sceleratus conducted?

Eastern Mediterranean and Black Sea Signup and view all the answers

Which researchers studied the length-weight relationships of four Lessepsian puffer fish species?

Bilge G, Filiz H, Yapıcı S Signup and view all the answers

What characteristics of Lagocephalus sceleratus were investigated off the coast of Lebanon?

Biological characteristics Signup and view all the answers

What is one of the main concerns about the expansion of Lagocephalus sceleratus in marine ecosystems?

It can produce toxic effects to humans. Signup and view all the answers

In which journal was the study on the possible intrusion of Lagocephalus sceleratus to the Turkish Black Sea coast published?

Journal Black Sea/Mediterranean Environment Signup and view all the answers

What is the primary focus of the EU Risk Assessment of Lagocephalus sceleratus?

Evaluation of data needs and criteria for non-indigenous species Signup and view all the answers

Which publication specifically addresses the effects of the Suez Canal expansion on marine bioinvasions?

Biological Invasions Signup and view all the answers

Which species is studied in Géffeney and Ruben’s research on tetrodotoxin?

Voltage-gated sodium channels Signup and view all the answers

What management aspect is highlighted in the study by Giakoumi et al. regarding marine invasive species?

Prioritization of management actions Signup and view all the answers

In which year was Linnaeus’ Systema Naturae published?

1789 Signup and view all the answers

What type of model is used to explain the fecundity dichotomy in fish populations according to Ganias et al.?

Temperature-dependent oocyte growth model Signup and view all the answers

What is the primary goal of the FAO-ICLARM Stock Assessment Tools II (FiSAT II)?

To provide tools for fish stock assessment Signup and view all the answers

Which scientific discipline primarily pertains to the research of the authors mentioned in the content?

Marine Biology Signup and view all the answers

What is the primary economic impact of the silver-cheeked toadfish on small-scale fisheries?

Damage to fishing equipment Signup and view all the answers

What was the mean annual economic cost of L. sceleratus depredation per vessel in Crete?

EUR 6315 ± 2620 Signup and view all the answers

Which factors significantly influenced the probability of depredation by L. sceleratus?

Fishing depth and sea surface temperature Signup and view all the answers

Where was L. sceleratus caught more frequently and in higher numbers?

Libyan Sea Signup and view all the answers

What change did fishers in Crete make in response to the depredation by L. sceleratus?

Altered fishing tactics Signup and view all the answers

What was the mean annual economic cost due to L. sceleratus depredation in the Ionian Sea?

EUR 258 ± 120 Signup and view all the answers

What is the scientific name of the silver-cheeked toadfish?

Lagocephalus sceleratus Signup and view all the answers

What specific regions were fishers interviewed from to assess the impact of L. sceleratus?

Cretan and Libyan Sea Signup and view all the answers

Study Notes

Lagocephalus sceleratus Impact on Mediterranean Fisheries

Lagocephalus sceleratus or the silver-cheeked toadfish is a toxic pufferfish that has caused significant disruptions to small-scale fisheries in the eastern Mediterranean.
This fish species has damaged fishing gear, including nets and longlines, causing economic losses for fishermen.
A study involving 141 fishermen from Crete and the Ionian Sea in Greece revealed the average annual economic loss due to L. sceleratus depredation to be €6315 ± €2620 per vessel in Crete and €258 ± €120 in the Ionian Sea.
Observer surveys on fishing vessels in Crete indicate that the probability of depredation is influenced by factors such as fishing depth, sea surface temperature, gear type, and geographical region.
L. sceleratus was caught more often and in larger numbers in the Libyan Sea compared to other parts of Crete.
To mitigate L. sceleratus's impact, fishermen in Crete have adapted their fishing strategies by fishing in deeper waters, reducing fishing time, and modifying their fishing gear.
The study emphasizes the urgent need for region-specific management plans to address the establishment of large populations of L. sceleratus.

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Description

This quiz explores the ecological and economic impacts of Lagocephalus sceleratus, the silver-cheeked toadfish, on Mediterranean fisheries. Delve into its effects on fishing gear and the consequent financial losses faced by fishermen in regions like Crete and the Ionian Sea. Understand how this species is influencing fishing strategies and practices.