The present study provides an integrative report combining morphological and molecular analysis of the deep sea shrimp species Hadropenaeus lucasii (Spence Bate, 1881) from the southwest coast of India. The present specimen was obtained from the depths of 200–300m from the commercial bottom trawlers operated off Sakthikulangara fishing harbour off Kollam, Kerala. A phylogenetic analysis was used to explore the relationships of the genus. DNA barcoding and phylogenetic analysis were used to explore the relationship of the genus Hadropenaeus based on mitochondrial gene.
Diet composition and feeding strategies of deep-sea caridean shrimp Heterocarpus woodmasoniAlcock,1901 are described from gut contents of 4,116 specimens collected from the southwestern coast of India. Knowledge of the species diet plays a prime effect on its biological aspects and its role in the ecological energetics of the community. All the analyses were performed in accordance with ecological (season) and biological factors (sex, size, and gonadal stages). The species was found to prey on diversified components such as detritus, foraminiferans, other crustaceans, molluscs, echinoderms, and fishes in their declining order of preponderance. Multivariate analysis of variance showed a significant difference (P<0.05) in the diet components according to the combination of sex along with season and gonadal stages. Values of the gastro-somatic index (GSI) showed a positive correlation with feeding activity, and its intensity.
In the face of depleting wild stocks of lobster globally, mariculture is widely viewed as a technology for enhancing production, resource efficiency, economics, and effective management of dwindling stocks while supporting livelihood security. We used a novel multi-stage experimental strategy followed by robust non-linear growth model simulations for establishing a Decision-Support System (DSS) to foster sustainable and cleaner production practices in lobster mariculture. The strategies explored in the first stage, which dealt with rearing lobsters in sea cages at increasing levels of technological development, significantly enhanced lobster production and thus, culture system productivity 5.9 times over unsustainable conventional systems. Growth performance, feed utilization, and survivability of lobsters were found to be significantly ameliorated in culture setup-3 (P ? 0.01), which was the most technologically advanced setup.
The occurrence of the Japanese hooked squid Onykia loennbergii in the Arabian Sea is reported here based on reexamination of a previously collected and misidentified specimen in the course of research on oceanic cephalopods from the Arabian Sea. The individual’s dorsal mantle length (DML) measured 325 mm and it weighed 493 g. The individual was a mature male with a relatively long penis (165 mm) with 73 spermatophores. The current report forms the first confirmed report of the genus Onykia in the tropical Arabian Sea.
Fish has emerged as an alternative model organism in biomedical research for conducting experimental pharmacological and toxicological studies. As a vertebrate, it shares many conserved physiological and molecular features with humans making it a valuable model for diagnosing, investigating disease states and testing drugs to check toxicity and therapeutic activity against the target. Zebrafish and medaka are mainstream models that are widely employed in pharmaceutical research. This study aims to highlight the probability and potential of fish as an alternative model organism in biomedical research, drug discovery and development. Further, it discusses the limitations of fish models in experimental pharmacological and toxicological studies considering the changes in the residing environment, physiology, metabolism, unpredictable inter-individual variability due to diseases, variable conditioning, and interspecific and intraspecific variability.