Reproductive Biology of Aquatic Species

Aquatic organisms exhibit a remarkable diversity of reproductive strategies shaped by ecological, evolutionary and physiological factors. Fish, molluscs and crustaceans may reproduce by releasing gametes into the water column or by internal fertilisation, with spawning patterns ranging from single, semelparous events to repeated, iteroparous cycles. Timing and synchrony of spawning are often governed by environmental cues such as temperature, photoperiod and food availability. Key reproductive parameters include age and size at first maturity, gonadosomatic index, fecundity and oocyte development, all of which influence population dynamics and resilience to exploitation. Sexual systems vary from strict gonochorism to sequential and simultaneous hermaphroditism, permitting adaptive flexibility in changing habitats. Histological and molecular techniques have expanded understanding of gonadal maturation, endocrine control and the impact of anthropogenic stressors on reproductive success. Insights into reproductive biology underpin effective management of fisheries, conservation of threatened species and the optimisation of aquaculture breeding programmes.

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Reproductive Biology of Aquatic Species publication trend

The graph below shows the total number of articles in reproductive biology of aquatic species across all publications each year (not limited to Nature Index journals).

Technical terms

Gonadosomatic index (GSI): The ratio of gonad weight to total body weight, expressed as a percentage, used to assess reproductive maturation.

Batch fecundity: The number of eggs or ova released in a single spawning event by an individual female.

Oocyte: An immature egg cell within the ovary, progressing through developmental stages prior to spawning.

Iteroparity: A reproductive strategy in which individuals spawn multiple times over their lifespan, as opposed to semelparity (single reproductive event).

Histology: The microscopic study of tissue structure, applied to gonadal sections to determine stages of gamete development.

References

1. A multidisciplinary method to assess the reproductive biology of Mystus bleekeri. Aquaculture and Fisheries (2023).
2. Ovarian traits, spawning pattern and season, length at first maturity, and batch fecundity of Caragobius urolepis (Bleeker, 1852) caught from the Vietnamese Mekong Delta. Heliyon (2024).
3. Estimation of Population Parameters of Glossogobius giuris in the Rabnabad Channel, Southern Bangladesh: Implications for Sustainable Management. Sustainability (2023).