Reproduction revisited—a decade of changes in the reproductive strategies of an invasive catfish, Pterygoplichthys disjunctivus (Weber, 1991), in Volusia Blue Spring, Florida

Abstract

Non-native populations of Pacific oysters Crassostrea gigas (Thunberg 1793) are established around the United Kingdom (UK), with two genetically different stocks originating from separate introductions to the UK and France. In this study, we use a coupled biophysical model to simulate Pacific oyster larval transport, in order to investigate the dispersal of the species from a known population near their northern limit on the west coast of the UK (in the Milford Haven Estuary). The model included a pelagic phase, simulating different swimming behaviours, and a settlement phase based on a hydrospatial substrate map. Following successful settlement elsewhere, subsequent releases simulated potential population spread over successive generations. Our results suggest that, should there be sufficiently warm sea temperatures to allow reproduction, dispersal away from Milford Haven Estuary would most be southeast ward towards the Bristol Channel; but dispersal north and west to Ireland is also possible, depending heavily on pelagic swimming behaviour. Seasonal modifications to circulation were less influential. Our study increases understanding of factors that contribute to oyster population spread, and suggests methods for improved management through numerical predictions.

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

“…Spent ovaries (regressive and recovering ones) and immature stages were noticed in the subsequent months. Such reproductive plasticity was also reported for P. disjunctivus by Gibbs et al (2017) from Volusia Blue Spring for a decade. The peak breeding season reported in P. pardalis by Wakida-Kusunoki, & Amador-del Angel (2011) was from June to September.…”

“…The reproductive traits of Pterygoplichthys spp such as size at maturity, spawning, sex-ratio, ova diameter, fecundity and reproductive plasticity are studied to have a better knowledge on the reproductive dynamics (Jumawan and Herrera, 2014;Gibbs et al, 2017) which is a prerequisite for the management measures of an invasive species (Hoover et al, 2005;Kopp et al 2009). The reproductive patterns of P. disjunctivus from Florida were extensively analysed by Gibbs et al (2017) for 10 years. In contrast, studies on the particular aspects of reproduction have been published by Rueda-Jasso et al ( 2013 The negative impacts caused by Pterygoplichthys spp.…”

Vermiculated sailfin catfish, Pterygoplichthys disjunctivus (Actinopterygii: Siluriformes: Loricariidae): Invasion, biology, and initial impacts in East Kolkata Wetlands, India

“…As the sex ratio was assessed based on capture based sampling using seine nets, the burrow-dwelling nature of males in breeding season makes them less vulnerable to capture in the nets, resulting in a lesser proportion of males in sample collections in the breeding season. The fecundity ranged from 4348 to 9567 for 20-55 cm TL; 200-1250 g fish with relative fecundity of 22 g -1 and 8 g -1 respectively, which is higher than that reported for the species by Gibbs et al (2008Gibbs et al ( , 2017 from Florida; Rueda-Jasso et al 2013from Mexico; and Jumawan et al (2016) from the Philippines. The warmer environment and the difference in food might be playing a role in higher fecundity of the fish in East Kolkata Wetlands.…”

“…have established in several countries (Copp et al 2005), the information on their biology, ecology, establishment, and abundance, which is important for managing its spread, is not widely DOI: 10.3750/AIEP/02551 available. Food habits of Pterygoplichthys disjunctivus (Weber, 1991) were investigated in the USA (Nico andMartin 2001, Hoover et al 2004) and Serbia (Simonović et al 2010); sex ratio-in the Philippines (Jumawan et al 2016), Hawaii (Yamamoto and Tagawa 2000), and Taiwan (Liang et al 2005); fecundity-in the USA (Gibbs et al 2008(Gibbs et al , 2017, Mexico (Rueda-Jasso et al 2013), and the Philippines (Jumawan et al 2016); and the size at first maturity and breeding period-in the USA (Gibbs et al 2008), the Philippines (Jumawan and Herrera 2014), and Mexico (Rueda-Jasso et al 2013). These parameters might differ within and/or across the regions of its occurrence.…”

Phenotypic Divergences in Growth and Reproduction Underpin The Invasion of Suckermouth-Amored Catfishes to Lotic and Limnic Habitats in Vietnam

“…In India and The Philippines, P. disjunctivus are multiple spawners only(Suresh et al 2019;Jumawan and Herrera 2014). The alteration in their reproductive strategies may be interpreted as an adaptation to variations in environmental, biological or geographical conditions(Gibbs et al 2017), which need to be clari ed in freshwater habitats in southern Vietnam.…”