<scp>Amazonian invaders in an Asian biodiversity hotspot</scp>: Understanding demographics for the management of the armoured sailfin catfish, <scp><i>Pterygoplichthys pardalis</i></scp> in Kerala, India

Raj, Smrithy; Kumar, Appukuttannair Biju; Raghavan, Rajeev; Dahanukar, Neelesh

doi:10.1111/jfb.14243

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…Studies by Raj et al (2019) and Roshni et al (2020) have shown that two invasive species P. pardalis and C. gariepinus, which have established healthy populations in the waterbodies of the SWG, can be managed only by targeting smallersized individuals rather than large adult fish; rapid growth rate, low fishing mortality and continuous recruitment contributes to the invasion success of the two species. The impact of P. reticulata, which has established even in many second-order streams of SWG, can be revealed only through detailed studies on invasion biology, as previous research indicate their strong invasion potential and impact on aquatic biodiversity (Sievers et al, 2012;El-Sabaawi Rana et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Distribution of alien invasive species in aquatic ecosystems of the southern Western Ghats, India

Raj

Prakash

Reghunath

et al. 2021

Aquatic Ecosystem Health &Amp; Management

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We present results of the first major attempt to record the distribution of aquatic alien species in the Western Ghats Biodiversity Hotspot using Geographical Information System. A total of 32 alien species, including four macrophytes (Salvinia molesta, Pistia stratiotes, Eichhornia crassipes and Cabomba furcata) and 28 fish were recorded from the southern part of the Western Ghats. Seven of these have established natural populations and are invasive, which includes Oreochromis mossambicus, O. niloticus (Cichlidae), Poecilia reticulata, Gambusia affinis (Poeciliidae), Pterygoplichthys pardalis (Loricariidae), Cyprinus carpio (Cyprinidae) and Clarias gariepinus (Clariidae). Oreochromis mossambicus is the most extensively distributed invasive fish in the region. Major reservoirs serve as a spawning hub for species such as C. gariepinus and C. carpio. Significant pathways for the establishment of most alien species in Western Ghats were aquarium trade and aquaculture. Given the increasing records of alien species and proliferation of invasive species in the southern region of the Western Ghats, urgent research and policy interventions are suggested, including the development of a comprehensive database on distribution, trade, invasion biology, as well as determining both short-term and longterm impacts on endemic fauna.

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Section: Discussionmentioning

confidence: 99%

Distribution of alien invasive species in aquatic ecosystems of the southern Western Ghats, India

Raj

Prakash

Reghunath

et al. 2021

Aquatic Ecosystem Health &Amp; Management

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“…Similarly, a number of introduced non-native ornamental fish are plying in aquarium trade and pet keeping (Singh et al, 2013b;Sandiliyan, 2016). As a result, several introduced non-native species of aquaculture and aquarium are now available in open waters including the forest reserves, protected areas and even coastal areas Lakra, 2011, Singh et al, 2013a;Sandilyan, 2016;Raj et al, 2019;Chakraborty et al, 2020;.…”

Section: Introductionmentioning

confidence: 99%

State of aquatic invasive species in tropical India: An overview

Singh

2021

Aquatic Ecosystem Health &Amp; Management

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India, a megadiverse tropical country is grappling with the rising trend of aquatic invasions. Out of 532 introduced non-native fish, 16 species of freshwater aquaculture and aquarium were assessed invasive by using a risk assessment protocol, ‘Fish Invasiveness Screening Test’. Six major identified invasion pathways of the aquatic invasive species were inadvertent or deliberate releases, escapes, contaminants from hatcheries, river corridors, stowaways and unaided introductions. Invasion mechanism further elucidated the factors promoting successful invasion in freshwater ecosystems. For predictive future performance of invasive fish, the concrete and predictive values based on mean abundance by weight was calculated. Over 28.67% and 29.02 % persistent increased yield of the invasive Tilapia and Common Carp respectively was predicted in the Ganga river in the coming decades. Single species Tilapia invasion facilitated multiple species fish invasion, manifesting in invasion meltdown. The trophic changes due to fish invasion exhibited biotic homogenization with trophic downgrading. Aquatic invasive species were found highly competitive interacting with native species causing serious biodiversity loss, health hazards, and economic damage consequently affecting the ecosystem services. In spite of available regulatory approaches and guidelines to manage aquatic invasive species, fish invasion has been on the rise. This paper suggests modifications and stringent implementation of the existing regulatory mechanisms besides adopting linkages, cutting-edge research on invasion science and modern molecular containment tools for effective management.

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“…This, coupled with the availability of plenty of detritus in the polluted drainages as food, provide them with a competitive edge over indigenous species, better reproductive strategies, including the ability to breed in burrows along the stream banks and crevices in the granite walls, accessory respiratory organs, batch spawning abilities and parental care assisted P. pardalis to colonize the system successfully. The population assessment of P. pardalis from the same habitat indicated that rapid growth, high growth performance index, and continuous recruitment are the reasons for their successful invasion, and targeting the young individuals would help in controlling the population of the invasive fish (Raj et al 2020). We recommend more research on the invasion biology of invasive P. pardalis, incorporating long-term studies to fully understand the long-term strategies for their establishment and plasticity in the reproductive behaviour.…”

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confidence: 99%

“…Based on the results of this work, it may be presumed that P. pardalis inhabiting the natural drainages without noticeable temperature variations is a batch spawner and temperature may not be an important limiting factor for spawning of fish that live in a habitat with stable or less fluctuating water temperature. The population assessment of P. pardalis from natural drainages of Thiruvananthapuram indicated rapid growth, high-performance index and continuous recruitment, which resulted in their successful invasion (Raj et al 2020). Maximum reproductive activity of P. disjunctivus and L. multiradiatus were reported from July to September (Liang et al 2005;Rueda-Jasso et al 2013).…”

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On the reproductive biology of the invasive Armoured Sailfin Catfish Pterygoplicthys pardalis (Castelnau, 1855) (Siluriformes: Loricariidae) from the natural drainages in Thiruvananthapuram, India

et al. 2021

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The present paper deals with the breeding biology of the invasive fish Pterygoplicthys pardalis from the natural drainages of Thiruvananthapuram, Kerala. The specimens were collected from Amayizhanchan Thodu, a natural drainage running through the heart of the city. A total of 145 males and 142 females were collected from January to December 2018. The sex ratio was determined monthly as the percentage of males to females (M: F). Monthly mean gonadosomatic index (GSI) values were compared using R stat, and GSI was plotted monthly to identify the spawning seasons. The gonads were examined and different stages of maturity were noted using standard methods. The length at first maturity was also found out. The fish exhibit courtship behaviour and the eggs are deposited in burrows and also along the crevices in the granite walls; the burrows are guarded by the male fish till the young ones are hatched out. The sex ratio showed an average mean value of 1.04: 1 and showed no significant departure. The size at first maturity was 23.9 cm standard length. The ova diameter studies show the presence of ripe ovaries throughout the year, with peaks during March and April and between August and September and in December, indicating the fish is a batch spawner. The absolute fecundity ranges from 923 to 14,777 eggs, and the relative fecundity ranges 0.0142–0.0015. Regression analysis showed a significant relationship (P <0.001) between absolute fecundity and the total length, the total body weight, and ovary weight. The strong breeding behaviour, the presence of accessory respiratory organs, the absence of natural enemies and parental care makes Pterygoplichthys pardalis a successful invader in the natural drainage. More biological studies are needed for the successful eradication of the species from the invaded ecosystem.

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Amazonian invaders in an Asian biodiversity hotspot: Understanding demographics for the management of the armoured sailfin catfish, Pterygoplichthys pardalis in Kerala, India

Cited by 12 publications

References 18 publications

Distribution of alien invasive species in aquatic ecosystems of the southern Western Ghats, India

Distribution of alien invasive species in aquatic ecosystems of the southern Western Ghats, India

State of aquatic invasive species in tropical India: An overview

On the reproductive biology of the invasive Armoured Sailfin Catfish Pterygoplicthys pardalis (Castelnau, 1855) (Siluriformes: Loricariidae) from the natural drainages in Thiruvananthapuram, India

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