The life cycle and precopulatory mate guarding behavior of the poecilostomatoid copepod Goidelia japonica associated with the spoon worm Urechis unicinctus (Echiura) are described based on specimens from 19 worms collected from western Japan. A total of 676 copepods were collected from the host’s rectum (494 copepods) and body surface (182 copepods). Copepod numbers were significantly correlate...

The Vibrio spp. are the most common and harmful shrimp pathogenic bacteria causing serious diseases of larval and postlarval stages in the hatchery. The Vibrio inhibitory activity of green algae Tetraselmis suecica has been reported in vitro (Austin and Day 1990).In these experiments, the inhibitory activity was assessed in vivo in a commercial shrimp hatchery of the white prawn Fenneropenaeus ...

Gravid adults of the common intertidal barnacle Semibalanus balanoides (L.) brood fully developed larvae until individuals perceive some cue from the environment that triggers synchronous larval release. The prevailing hypothesis has been that phytoplankton blooms trigger release because they provide a food source for nauplius larvae. Through observations and field experiments, we tested the hy...

King crab larval culture has expanded from small-scale research to hatchery and stock enhancement feasibility studies in Alaska. The goal of this project was to improve red king crab (Paralithodes camtschaticus) larval survival in culture by assessing diets and water sources in two separate experiments. Diet treatments included (1) newly hatched Artemia nauplii, and (2) newly hatched Artemia na...

A quantitative study of metazoan meiofauna was carried out on bathyal sediments (305, 562, 830 and 1210m) along a transect within and beneath the oxygen minimum zone (OMZ) in the southeastern Pacific off Callao, Peru (128S). Meiobenthos densities ranged from 1517 (upper slope, middle of OMZ) to 440– 548 ind. 10 cm 2 (lower slope stations, beneath the OMZ). Nematodes were the numerically dominan...

Decorator crab Camposcia retusa is a popular marine ornamental species; however, it has never been bred previously. To establish feeding regime for C. larvae, which include two zoeal and megalopal stage, three experiments were conducted. In all experiments, ≥60% of unfed 1st (Z1) larvae survived to the next combined with orange guts observed in fed Artemia, suggesting Z1 are facultative lecitho...

Light is a fundamental environmental cue which influences the migration of many marine organisms. For salmon louse Lepeophtheirus salmonis , light believed to drive diel vertical behaviour their planktonic larvae. Salmon lice are critical importance salmonid industry due damage they cause wild and farmed hosts. larvae have an eyespot positively phototactic, yet how intensity alters distribution...

Abstract The traditional view is that the Arctic polar night a quiescent period for marine life, but recent reports of high levels feeding and reproduction in both pelagic benthic taxa have challenged this. We examined zooplankton community present Svalbard fjords, coastal waters, shelf break north Svalbard, during night. focused on population structure abundant copepods ( Calanus finmarchicus ...