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Table 2. Results of ti trials in Halmahera walking shark (H. halmahera). The results of Halmahera walking shark’s TI induction and duration time can be seen in table 2. The result showed that average duration of TI (17 s) can be used as the windows opportunity to assess the morphometric of the halmahera walking shark, without causing fatality. The morphometric measurement result on table 1 shows that all parameter of morphometric can be completely measured within the TI phase of Halmahera walking shark (which in average three measurement in each TI).

Table 2 Results of ti trials in Halmahera walking shark (H. halmahera). The results of Halmahera walking shark’s TI induction and duration time can be seen in table 2. The result showed that average duration of TI (17 s) can be used as the windows opportunity to assess the morphometric of the halmahera walking shark, without causing fatality. The morphometric measurement result on table 1 shows that all parameter of morphometric can be completely measured within the TI phase of Halmahera walking shark (which in average three measurement in each TI).

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Figure 1. Inverting the walking shark (H. halmahera) for tonic immobility. This study was conducted between June, 8" to 10", 2019 at the Tidore Island, North Maluku Province, Indonesia. The specimen was caught using small nets (40 cm height, 40 cm width, and 100 cm length) from the coastal area of the island. In this study, we used only one specimen to test the TI approach, herefore we cannot compare the TI response between male and female individual, although it was hypothesized that female is more susceptible and induction time will increase in size and age in sandbar shark and smooth dogfish (Whitman 1984, Whitman ef al 1986). Each TI trial was conducted by restraining the subject as quickly and as gently as possible. The investigator gently rubbed and massaged both side of the snout, where Lorenzini Ampullae pores of the H. halmahera were densely ocated. In the specimen where TI was induced, a deep rhythmic respiration was observed, as a deeper and more constant ventilation of the gills and decreased respiration rate (figure 1).
Figure 1. Inverting the walking shark (H. halmahera) for tonic immobility. This study was conducted between June, 8" to 10", 2019 at the Tidore Island, North Maluku Province, Indonesia. The specimen was caught using small nets (40 cm height, 40 cm width, and 100 cm length) from the coastal area of the island. In this study, we used only one specimen to test the TI approach, herefore we cannot compare the TI response between male and female individual, although it was hypothesized that female is more susceptible and induction time will increase in size and age in sandbar shark and smooth dogfish (Whitman 1984, Whitman ef al 1986). Each TI trial was conducted by restraining the subject as quickly and as gently as possible. The investigator gently rubbed and massaged both side of the snout, where Lorenzini Ampullae pores of the H. halmahera were densely ocated. In the specimen where TI was induced, a deep rhythmic respiration was observed, as a deeper and more constant ventilation of the gills and decreased respiration rate (figure 1).
This shark was identified as a young female with 495 mm length (maximum total length 790 mm, Jutan 2018) and 290 g weight. Complete result of morphometric measurement was shown in table 1.
This shark was identified as a young female with 495 mm length (maximum total length 790 mm, Jutan 2018) and 290 g weight. Complete result of morphometric measurement was shown in table 1.
The results showed that induction time of the Halmahera walking shark (28.3 s) was relatively faster than swellshark (36 s), Carribean reef shark (30 s), but longer than blacktip reef shark (25 s), whitetip reef shark (21 s), and almost as long as leopard shark (28 s) (Henningsen 1994). For the duration of TI, Halmahera walking shark (17 s) was faster than leopard shark (37 s, Henningsen 1994), swellshark (85 s, Henningsen 1994), blacktip reef shark (92 s, Davie 1993), whitetip reef shark (177 s, Henningsen 1994), and Carribean reef shark (274 s, Henningsen 1994) (figure 2).
The results showed that induction time of the Halmahera walking shark (28.3 s) was relatively faster than swellshark (36 s), Carribean reef shark (30 s), but longer than blacktip reef shark (25 s), whitetip reef shark (21 s), and almost as long as leopard shark (28 s) (Henningsen 1994). For the duration of TI, Halmahera walking shark (17 s) was faster than leopard shark (37 s, Henningsen 1994), swellshark (85 s, Henningsen 1994), blacktip reef shark (92 s, Davie 1993), whitetip reef shark (177 s, Henningsen 1994), and Carribean reef shark (274 s, Henningsen 1994) (figure 2).
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