Assessment of impacts of invasive fishes on the food web structure and ecosystem properties of a tropical reservoir in India

Khan, M. Feroz; Panikkar, Preetha

doi:10.1016/j.ecolmodel.2009.05.020

Cited by 59 publications

(6 citation statements)

References 53 publications

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“…In this study, we evaluate the role of interactions, environmental variation, and fishery on the food web of a reservoir in the Brazilian semiarid region. Our models were built with the Ecopath with Ecosim (EwE) approach, commonly applied to marine environments (Coll & Libralato, 2012;Heymans et al, 2014), but also used in freshwater environments (e.g., Angelini et al, 2006Angelini et al, , 2013Feroz Khan & Panikkar, 2009). We based our approach on local sampling (including birds, invertebrates, fishes, fish gut content, and landing data estimate) of a reservoir in wet and dry seasons and an annual model.…”

Section: Introductionmentioning

confidence: 99%

Food web changes associated with drought and invasive species in a tropical semiarid reservoir

et al. 2017

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Fish and invertebrates are introduced in freshwaters around the world for commercial purposes, despite widely known impacts on food webs and biological invasions. As a proxy for artificial environments, we modeled a typical reservoir in a Brazilian semiarid region using an ecosystem approach. We compared the role of native and nonnative invasive species (NIS) in the food web, between dry and wet periods, and under the influence of an extreme drought period (from 2011 to 2015), simulating the variation in fish biomasses due to decreasing consumption. Key ecosystem groups were fishes (mainly NIS), birds, and insects. Nutrient cycling was dependent on invaders, while the trophic structure was detritus based during the drought. Biomass of detritivores was almost two times higher than herbivores, and native fish species decreased abruptly in response to invaders and volume variation. The dominance of low-trophic levels (TLII) and tilapia-Oreochromis niloticus (Linnaeus, 1758) and other tilapiines-resulted from interactions among invaders, feeding behavior on benthos, and environmental seasonality, tending toward biotic homogenization (''benthification'') at the ecosystem level. An increasing relevance of detritivores with cascading effects in ecosystems subject to drought, multiple

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Section: Introductionmentioning

confidence: 99%

Food web changes associated with drought and invasive species in a tropical semiarid reservoir

et al. 2017

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“…Likewise, low trophic levels, including detritus, positively influenced almost all organisms at high trophic levels in studies on the Chilika lagoon (Behera et al, 2020) and the southern shores of India (Antony et al, 2010). Thus, low trophic levels are significantly important, comprise the basal feed of other groups, and are of paramount importance in most ecosystems (Feroz Khan & Panikkar, 2009). Among the studied fish species, S. tumbil and then T. lepturus showed the strongest influence on the influenced group, with dualistic effects in different cases.…”

Section: Discussionmentioning

confidence: 99%

Trophic structure using ecological relationships between five dominant commercial fish in Kolahi to Dargahan

et al. 2023

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The purpose of this study was to determine the effects of frequent species population fluctuations and the impact of different rates of exploitation on other ecological links in the food web. The mass-balanced Ecopath model represents the trophic interactions among the 31 defined functional groups in the Kolahi to Dargahan area, with five main species, including Trichiurus lepturus, Saurida tumbil, Nemipterus japonicus, Sillago sihama, and Cynoglossus arel (from April 2018 to April 2019). To investigate the effects of fishing and environmental disturbances, the Ecopath modeling approach combines software for analyzing ecosystem trophic-level balances with population dynamic models. In the past 5 years, Hormozgan province has caught more than 45% of the benthic fish caught off the northern coasts of the Persian Gulf. From Kolahi to Dargahan, one of the most important fishing grounds in this province's southeast is located. Food web models are used to represent a marine system's current state, assess stock levels, and predict change over time. Over a year, the first five dominant fish in the study area, S. tumbil, S. sihama, C. arel, N. japonicus, and T. lepturus, were biometrically measured, and their population dynamics parameters as well as feeding ecology indices were analyzed. According to the trophic-level index results, the five most common species studied in this study belonged to the third (N. Japonicas, S. sihama, and C. arel) and fourth (T. lepturus, and S. tumbil) trophic levels. The key species with the greatest impact on other groups of studied species were identified as S. tumbil and T. lepturus, respectively. The estimated ecosystem indicators were the system operational power (75846.797), the primary production/respiration ratio (0.034), the connectance index (0.159), and the system omnivory index (0.253). A pedigree index (PI) of 0.38 was estimated for the present model. Overexploitation of T. lepturus could disrupt the aquatic food web and adversely affect the long-term sustainable use of aquatic resources, according to data. As a result, ecosystem-based fisheries management should be implemented to find a more appropriate solution to sustainable exploitation in the studied habitat, an important fishing area in the Persian Gulf's north.

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“…The African catfish ( Clarias gariepinus ) is one of the major fish species cultured in Africa. It has also been introduced into aquaculture in different parts of the world, including the Netherlands, Hungary, much of South-East Asia, and East Asia [ 10 ]. The species is also one of the most important individual commercial freshwater fish in many parts of Africa [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical and Physical Properties of African Catfish (Clarias gariepinus) Fillet Following Prolonged Feeding with Insect Meal-Based Diets

Gebremichael,

Szabó,

Sándor

et al. 2023

Aquaculture Nutrition

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A 25-week experiment was undertaken to explore the effect of partial replacement of dietary fishmeal (FM) with black soldier fly meal (Hermetia illucens) (BS), mealworm meal (Tenebrio molitor) (MW), and a 1 : 1 mixture of both insect meals (BSMW) on fillet quality in African catfish (Clarias gariepinus). A total of 96 fish with an average initial body weight of 248 ± 28 g were stocked into a recirculating aquaculture system and fed in four different dietary groups (control, BS, MW, and BSMW). No mortality was recorded in any of the groups. At the end of the feeding period, 24 fish (n = 6 for each treatment, weight between 690 and 822 g) were used for analysis. There was no alteration in filleting yield or other slaughter indices within experimental groups, except the hepatosomatic index. Among quality attributes, pH 24 hr postmortem exhibited a significant difference ( p < 0.05 ). In respect of the fatty acid profile, the n-6/n-3 ratio ranged between 1.17 and 1.40 but was not significantly modified by the partial replacement of FM. Similarly, the proximate composition of the fillets was not significantly different between the control and experimental diet groups. The ratio of polyunsaturated fatty acid to saturated fatty acids ranged between 0.67 and 0.79 in the fillets, without significant differences between groups. The atherogenic index was increased in the BS group, as compared to the others; however, the thrombogenicity index of fillets was not significantly affected. Similarly, the conventional quality traits of the fillet, such as cooking, drip, and thawing losses, did not differ within treatments. This study demonstrates that the dietary inclusion of black soldier fly and/or mealworm meals used for African catfish at the tested inclusion level has negligible impact on fillet properties.

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Assessment of impacts of invasive fishes on the food web structure and ecosystem properties of a tropical reservoir in India

Cited by 59 publications

References 53 publications

Food web changes associated with drought and invasive species in a tropical semiarid reservoir

Food web changes associated with drought and invasive species in a tropical semiarid reservoir

Trophic structure using ecological relationships between five dominant commercial fish in Kolahi to Dargahan

Chemical and Physical Properties of African Catfish (Clarias gariepinus) Fillet Following Prolonged Feeding with Insect Meal-Based Diets

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