Major carps are prevalent species in the aquaculture sector due to their greater growth, ease of maintenance, and ability thrive country’s excellent agricultural conditions. However, natural carp spawn supply is predominantly declining as a result environmental anthropogenic causes spawning grounds. The study’s objective was identify areas for Surma River (Sylhet haor basin). research carried o...

Over the past five years we have investigated and used commercial fishing vessels and their associated acoustic hardware as platforms for acoustic surveying and data collection. During this period we developed an automated acoustic logging system that will simultaneously record data from the ship’s existing sounder, sonar, and navigation systems. The system was designed to be self contained and...

Empirical evidence exists that some marine animals perceive and orient to local distortions in the earth's main static geomagnetic field. The magnetic fields produced by undersea electric power cables that carry electricity from hydrokinetic energy sources to shore-based power stations may produce similar local distortions in the earth's main field. Concerns exist that animals migrating along t...

—American shad Alosa sapidissima in semelparous and iteroparous populations along its native range are thought to have nearly equivalent lifetime reproductive output due to reciprocal latitudinal trends in fecundity and degree of repeat spawning. Geographic differences in reproductive patterns are believed to be linked to varying environmental conditions, and this fine tuning is considered stro...

Substratum quality and oxygen supply to the interstitial zone are crucial for the reproductive success of salmonid fishes. At present, degradation of spawning grounds due to fine sediment deposition and colmation are recognized as main factors for reproductive failure. In addition, changes in water temperatures due to climate change, damming, and cooling water inlets are predicted to reduce hat...

Variations in otolith patterns, sizes and body morphometrics of jack mackerel Trachurus japonicus juveniles were investigated. Under transmitted light, translucent (W(t)) and opaque otoliths (W(o)) were detected in juveniles collected from Wakasa Bay between July 2005 and April 2006, whereas only opaque otoliths (G(o)) were detected in Goto-nada Sea individuals between May and June 2006. Three ...

An individual based, discrete and stochastic model for the collective motion of fish presented in Hubbard et al. (2004) is applied to the task of simulating migrations of capelin in the seas around Iceland. In this application the individual particles may be viewed as small schools of fish that are self-propelled and interacting in such a way that the motion is governed on one hand by a tendenc...

In species with high migratory potential, the genetic signal revealing population differentiation is often obscured by population admixture. To our knowledge, the explicit comparison of genetic samples from known spawning and feeding areas has not been conducted for any highly migratory pelagic fish species. This study examines the geographic heterogeneity of swordfish mitochondrial DNA (mtDNA)...