A Report on the Recruitments of Alopias Pelagicus and Alopias Superciliosus in the Andaman Sea

Das, Prasanta Kumar; Sinha, Manas Kumar; Bhargava, Ajay; Singh, Puran; Sahu, Kanhu Charan; Mali, Kiran S.

doi:10.15406/jamb.2016.04.00099

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…In contrast, Alopiids such as the common thresher Alopias vulpinus have small litters of typically 2-4 pups per reproductive cycle but may have gestation periods as short as 9-12 months (e.g., Gubanov 1972; Natanson and Gervelis 2013) with a one-year rest. Other threshers, such as A. superciliosus and A. pelagicus, forgo reproductive seasonality entirely, with females possibly becoming pregnant again immediately after parturition (Chen et al 1997;Liu et al 1999;Das (Bansemer and Bennett 2009), suggesting that variability in reproductive periodicity may be influenced by regional adaptation.…”

Section: Discussionmentioning

confidence: 99%

It’s a shark-eat-shark world, but does that make for bigger pups? A comparison between oophagous and non-oophagous viviparous sharks

Miller

Wails

Sulikowski

2022

Rev Fish Biol Fisheries

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Oophagous reproduction (i.e., consumption of unfertilized ova in utero) in sharks has been hypothesized to result in fewer but larger pups relative to those produced by viviparous sharks with different modes of maternal nutrient transfer. We compared pup and litter sizes reported in the literature for 106 shark species with lecithotrophic viviparity, oophagy, and placental viviparity as methods of maternal nutrient transfer during pregnancy. Using a suite of permutational tests, we accounted for the effect of maternal size to test whether oophagous strategies do indeed result in larger pups and smaller litters relative to sharks with lecithotrophic and placental viviparous reproduction. Our results demonstrated that litter size was significantly reduced in species with oophagous reproduction relative to sharks with lecithotrophic and placentally viviparous reproduction. Further, the influence of oophagous reproduction on pup length was more variable, and generally pup length of oophagous species was only larger than sharks with lecithotrophic viviparous reproduction. However, when maternal investment was expressed as litter mass (minimum pup mass by litter size), the effect of oophagy was neutralized. We found further evidence that pup length at birth was directly modulated by litter size and habitat, suggesting pup length at birth may also be adapted to conditions at nursing grounds. Our study supports the hypothesis that both placentally viviparous and lecithotrophic viviparous species maximize their reproductive fitness by allocating nutrients to larger litters of pups, whereas oophagous species maximize reproductive fitness through smaller litters of pups that may be well adapted to their nursing grounds.

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Section: Discussionmentioning

confidence: 99%

It’s a shark-eat-shark world, but does that make for bigger pups? A comparison between oophagous and non-oophagous viviparous sharks

Miller

Wails

Sulikowski

2022

Rev Fish Biol Fisheries

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Reproductive biology of the bigeye thresher, Alopias superciliosus, in the Tropical Eastern Pacific Ocean

Calle-Morán

Fogacho-Guingla

Hernández-Téllez

et al. 2023

Regional Studies in Marine Science

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Thresher sharks (Alopiidae) catch in the pelagic fisheries of Western Indonesia

Ichsan

Ula

Simeon

et al. 2020

IOP Conf. Ser.: Earth Environ. Sci.

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Thresher sharks (family Alopiidae) are an evolutionarily distinct and globally endangered species group. Indonesia is the world’s largest shark fishing nation, and a global priority for reducing the capture of threatened shark species. Kutaradja port is one of Indonesia’s largest fishing ports, located in the capital of Aceh Province, Banda Aceh, Western Indonesia. Kutaradja is a large oceanic port serving a variety of fisheries, from small scale to industrial fleets. One of the main fisheries operating from Kutaradja port is an industrial purse seine fleet targeting valuable pelagic fish, particularly tuna. Pelagic sharks such as threshers are vulnerable to capture in these fisheries, due to their co-occurrence with stocks of valuable pelagic species. Here we describe the volume and composition of shark catch in Kutaradja’s purse seine fleet, based on daily landing monitoring conducted in January 2017 to May 2019. Our results show that the dominant species caught are thresher sharks (Alopiidae), which make up 51% of all shark landings. A total of 627 thresher sharks were landed during the monitoring period, consisting of 558 individuals of pelagic threshers shark (Alopias pelagicus) and 69 individuals of bigeye thresher shark (Alopias superciliosus). The catch is dominated by mature females, which could be particularly detrimental to the reproductive capacity of the population. Fishers in purse seine vessels often catch these threshers with hand-lines, which are used as a secondary gear while the main fishing gear is soaking. Based on these findings, we proposed recommendations for reducing thresher shark fishing mortality, including restricting the use of secondary fishing gears and releasing incidentally captured sharks.

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A Report on the Recruitments of Alopias Pelagicus and Alopias Superciliosus in the Andaman Sea

Cited by 3 publications

References 10 publications

It’s a shark-eat-shark world, but does that make for bigger pups? A comparison between oophagous and non-oophagous viviparous sharks

It’s a shark-eat-shark world, but does that make for bigger pups? A comparison between oophagous and non-oophagous viviparous sharks

Reproductive biology of the bigeye thresher, Alopias superciliosus, in the Tropical Eastern Pacific Ocean

Thresher sharks (Alopiidae) catch in the pelagic fisheries of Western Indonesia

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