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24 results for “cuttlefish”
Figure 3 in Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)
Figure 3. Monthly average length and standard deviation distribution of S. orbignyana in the Aegean Sea.
Cuttlefish retrieve whether they smelt or saw a previously encountered item
<p><span>According to the Source Monitoring Framework, the origin of a memory is remembered through the retrieval of specific features (<i>e.g.</i> perceptive, sensitive, affective signals). In two source discrimination tasks, we studied the ability of cuttlefish to remember the modality in which an item had been presented several hours ago. In experiment 1, cuttlefish were able to retrieve the modality of presentation of a crab (visual vs olfactory) sensed before 1h and 3hrs delays. In experiment 2, cuttlefish were trained to retrieve the modality of presentation of fish, shrimp, and crabs. After training, cuttlefish performed the task with another item never encountered before (e.g. mussel). Cuttlefish successfully passed transfer tests without and with delay (3hrs). This study is the first to show the ability to discriminate between two sensory modalities (<i>i.e. </i>see vs smell) in an animal. Taken together, these results suggest that cuttlefish can retrieve perceptual features of a previous event, namely whether they had seen or smelled an item. </span></p>
Figure 8. S in Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)
Figure 8. S. orbignyana egg diameter distribution percentages for different gonad stages.
Figure 4 in Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)
Figure 4. Bathymetric distribution of the different-sized S. orbignyana in the Aegean Sea.
Does the egg capsule protect against chronic UV-B radiation? A study based on encapsulated and decapsulated embryos of cuttlefish Sepia officinalis
<p>Although the egg capsule plays a crucial role in the embryonic development of cephalopods, its ability to protect embryos from Ultraviolet (UV) radiation is unknown. Our study evaluated the photoprotection mechanisms of <em>Sepia officinalis</em> to UV-B radiation and estimated the ability of the black capsule to act as a physical shield against it. Embryos with (BC) and without capsule (WC) and juveniles were exposed to four experimental UVB conditions for 55 days. The effects of different UVB doses were evaluated in terms of morphological abnormalities and differences in gene expression between each group. We observed that the development might be severely impaired in embryos exposed to UVB without capsule protection and these effects were time- and UVB-dose-dependent. In addition, we found variations in gene expression levels (light-sensitive, stress response, and DNA repair) in different tissues as a function of UVB doses. We suggest a relationship between morphological abnormalities and the limit of molecular regulation. These results suggest that the quantitative differences in expression are essential for defining the survivability of the embryo face to UVB. Thus, we demonstrated that the egg capsule could ensure successful embryonic development of the cuttlefish <em>S. officinalis</em> even at high doses of UVB.</p>
Does the egg capsule protect against chronic UV-B radiation? A study based on encapsulated and decapsulated embryos of cuttlefish Sepia officinalis
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Cuttlefish retrieve whether they smelt or saw a previously encountered item
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Stealth and deception: adaptive motion camouflage in hunting broadclub cuttlefish
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Assessing the effectiveness of cuttlefish traps based on lure prevalence, survival and maturity status
<p>Trap fishing is viewed as a low impact and fuel-efficient capture technique that is drawing increasing attention. However, due to their low capture efficiency fisheries sustainability may only be attained through improving profitability of these gears. The present study attempted to provide the necessary background for the establishment of a cuttlefish trap fishery in Thermaikos gulf (E. Mediterranean), a heavily fished area by gears of questionable sustainability such as the trammel nets. This task required the implementation of gear types and fishing operation techniques from other fishing areas. However, the use of empty traps or traps equipped with an artificial spawning substrate like branches of shrubs proved ineffective. Cuttlefish catches were only successful by baiting the cuttlefish trap with a female lure which entices males to enter the trap. We hereby propose that the method of choice is determined by the physical characteristics of the fishing-ground area. Other important factors including the shape and size of trap entrances and soak time are also investigated in an attempt to address crucial knowledge gaps and identify what the optimum fishing protocol and trap technical characteristics are for this potentially new métier for the Greek small-scale fisheries.</p>
Cuttlefish show flexible and future-dependent foraging cognition
<p>Some animals optimise their foraging activity by learning and memorising food availability, in terms of quantity and quality, and adapt their feeding behaviour accordingly. Here we investigated whether cuttlefish flexibly adapt their foraging behaviour according to the availability of their preferred prey. In Experiment 1, cuttlefish switched from a selective to an opportunistic foraging strategy (or <i>vice versa</i>) when the availability of their preferred prey at night was predictable versus unpredictable. In Experiment 2, cuttlefish exhibited day-to-day foraging flexibility, in response to what will happen in the proximate future (i.e. preferred prey available on alternate nights). In Experiment 1, the number of crabs eaten during the day decreased when shrimp (i.e. preferred food) were predictably available at night, while the consumption of crabs during the day was maintained when shrimp availability was unpredictable. Cuttlefish quickly shifted from one strategy to the other, when experimental conditions were reversed. In Experiment 2, cuttlefish only reduced their consumption of crabs during the daytime when shrimps were predictably available the following night. Their daytime foraging behaviour appeared dependent on shrimps' future availability. Overall, cuttlefish can adopt dynamic and flexible foraging behaviours including selective, opportunistic and future-dependent strategies, in response to changing foraging conditions.</p>
Pangenome_benchmark_cuttlefish_length
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Cuttlefish show flexible and future-dependent foraging cognition
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Data from: To be seen or to hide: visual characteristics of body patterns for camouflage and communication in the Australian giant cuttlefish, Sepia apama.
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Data from: Fighting and mating success in giant Australian cuttlefish is influenced by behavioural lateralization
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Assessing the effectiveness of cuttlefish traps based on lure prevalence, survival and maturity status
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Data from: Number sense and state-dependent valuation in cuttlefish
Identifying the amount of prey available is an important part of an animal's foraging behaviour. The risk-sensitive foraging theory predicts that an organism's foraging decisions with regard to food rewards depending upon its satiation level. However, the precise interaction between optimal risk-tolerance and satiation level remains unclear. In this study, we examined, firstly, whether cuttlefish, with one of the most highly evolved nervous system among the invertebrates, have number sense, and secondly, whether their valuation of food reward is satiation state dependent. When food such as live shrimps is present, without training, cuttlefish turn toward the prey and initiate seizure behaviour. Using this visual attack behaviour as a measure, cuttlefish showed a preference for a larger quantity when faced with two-alternative forced choice tasks (1 versus 2, 2 versus 3, 3 versus 4 and 4 versus 5). However, cuttlefish preferred the small quantity when the choice was between one live and two dead shrimps. More importantly, when the choice was between one large live shrimp and two small live shrimps (a prey size and quantity trade-off), the cuttlefish chose the large single shrimp when they felt hunger, but chose the two smaller prey when they were satiated. These results demonstrate that cuttlefish are capable of number discrimination and that their choice of prey number depends on the quality of the prey and on their appetite state. The findings also suggest that cuttlefish integrate both internal and external information when making a foraging decision and that the cost of obtaining food is inversely correlated with their satiation level, a phenomenon similar to the observation that metabolic state alters economic decision making under risk among humans.
Figure 5 in Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)
Figure 5. Male and female distribution of 50% of the population (ML 50) at the size of maturity of S. orbignyana obtained from the Aegean Sea.
Data from: Number sense and state-dependent valuation in cuttlefish
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Figure 1 from: Liu L, Zhang Y, Hu X, Lü Z, Liu B, Jiang LH, Gong L (2019) Multiple paternity assessed in the cuttlefish Sepiella japonica (Mollusca, Cephalopoda) using microsatellite markers. ZooKeys 880: 33-42. https://doi.org/10.3897/zookeys.880.33569
Figure 1 S. japonica mating in the head-to-head position.
Figure 9 in Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)
Figure 9. Average spermatophore length–mantle length relationship.
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Allen Brain Atlas
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